CN108642404B - Fatigue-resistant corrosion-resistant twinning-induced plastic steel and preparation method thereof - Google Patents
Fatigue-resistant corrosion-resistant twinning-induced plastic steel and preparation method thereof Download PDFInfo
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Abstract
本发明公开了一种抗疲劳耐腐蚀孪生诱发塑性钢及其制备方法。本发明中首先采用高Mn、高C和高Cr的合金设计，再通过添加N、Ti和Nb等辅助合金元素，同时结合适当的固溶、时效热处理，使TWIP钢获得理想的强化效果和钝化效应，从而保证材料具有良好的强韧性、抗疲劳性能和耐蚀性能，有助于解决普通TWIP钢或不锈钢存在的强韧性不足或耐蚀性较差的根本性问题。
The invention discloses a fatigue-resistant and corrosion-resistant twinning induced plasticity steel and a preparation method thereof. In the present invention, the alloy design of high Mn, high C and high Cr is adopted firstly, and then by adding auxiliary alloying elements such as N, Ti and Nb, combined with appropriate solid solution and aging heat treatment, the TWIP steel can obtain the ideal strengthening effect and dullness. Therefore, it can ensure that the material has good strength and toughness, fatigue resistance and corrosion resistance, which helps to solve the fundamental problems of insufficient strength and toughness or poor corrosion resistance of ordinary TWIP steel or stainless steel.
Description
技术领域technical field
本发明涉及合金钢加工领域，特别设计一种抗疲劳耐腐蚀孪生诱发塑性钢及其制备方法。The invention relates to the field of alloy steel processing, and particularly designs a fatigue-resistant, corrosion-resistant twinning-induced plasticity steel and a preparation method thereof.
背景技术Background technique
孪生诱发塑性钢(TWIP钢)是一种单相奥氏体钢，具有极高的强韧性尤其是塑性，在航空航天、国防以及车辆、道路、桥梁、建筑、管道、低温储罐等领域有广泛的应用前景。孪生诱发塑性钢的基本加工过程为：在真空电炉惰性气氛保护下熔炼形成合金，经锻造、轧制成形，再经热处理获得不同晶粒尺寸的等轴奥氏体晶。孪生诱发塑性钢的典型力学性能为：屈服强度250～350MPa，抗拉强度500～600MPa，断后伸长率70～85％。Twin-induced plasticity steel (TWIP steel) is a single-phase austenitic steel with extremely high strength and toughness, especially plasticity. Broad application prospects. The basic processing process of twin-induced plasticity steel is as follows: smelting to form an alloy under the protection of an inert atmosphere in a vacuum electric furnace, forging and rolling to form, and then heat treatment to obtain equiaxed austenite crystals with different grain sizes. The typical mechanical properties of twin-induced plasticity steel are: yield strength of 250 to 350 MPa, tensile strength of 500 to 600 MPa, and elongation after fracture of 70 to 85%.
但是，由于晶粒表面缺少钝化层，TWIP钢的耐蚀性较差。研究表明，由于Al在酸性溶液中的非钝化倾向以及Fe的溶解，Fe-Mn-Al-Si系TWIP钢在酸性腐蚀介质中的耐蚀性较差；在盐等中性溶液中，由于Al有很强的成膜倾向，故Fe-Mn-Al-Si系TWIP钢的耐蚀性略好于酸性溶液；对于碱性溶液来说，由于Mn和Fe的钝化效应，Fe-Mn-Al-Si系TWIP钢的耐蚀性与一般结构钢没有明显差别。总体上看，TWIP钢在水性环境中的耐蚀性远远低于不锈钢。TWIP钢耐蚀性低的缺点，已经成了限制其广泛应用的重要制约性因素之一。However, the corrosion resistance of TWIP steel is poor due to the lack of passivation layer on the grain surface. Studies have shown that due to the non-passivation tendency of Al in acidic solutions and the dissolution of Fe, Fe-Mn-Al-Si TWIP steels have poor corrosion resistance in acidic corrosive media; in neutral solutions such as salt, due to Al has a strong tendency to form films, so the corrosion resistance of Fe-Mn-Al-Si TWIP steels is slightly better than that of acidic solutions; for alkaline solutions, due to the passivation effect of Mn and Fe, Fe-Mn- The corrosion resistance of Al-Si based TWIP steel is not significantly different from that of general structural steel. Overall, the corrosion resistance of TWIP steel in aqueous environments is much lower than that of stainless steel. The disadvantage of low corrosion resistance of TWIP steel has become one of the important restrictive factors limiting its wide application.
与其它Fe基合金一样，要提高TWIP钢的耐蚀性，也需在其中添加适当的Cr。这是因为Cr可在晶粒表面形成富Cr的钝化层，阻止微电池的形成，从而避免了晶界腐蚀。此外，Cr还可以增加低错配能小角晶界(2～10°)，因此也有利于提高TWIP钢的耐蚀性能。但是，Cr合金化对TWIP钢的力学性能尤其是塑性是极为不利的。据报道，以Cr、N辅助合金化的TWIP钢，断后伸长率仅为33％左右。当Cr含量由1％增至4％时，断后伸长率则进一步下降至30％左右，大大低于一般的Fe-Mn-Al-Si系和Fe-Mn-C系TWIP钢(A≥70％)。因此，在通过Cr合金化改善TWIP钢耐蚀性的同时，还须对奥氏体组织的稳定性、层错能、变形机制以及力学性能的变化进行系统研究，以减少Cr产生的负面影响。Like other Fe-based alloys, to improve the corrosion resistance of TWIP steel, it is also necessary to add appropriate Cr. This is because Cr can form a Cr-rich passivation layer on the grain surface, preventing the formation of microbatteries, thereby avoiding grain boundary corrosion. In addition, Cr can also increase the low-misfit energy small-angle grain boundaries (2-10°), so it is also beneficial to improve the corrosion resistance of TWIP steel. However, Cr alloying is extremely detrimental to the mechanical properties, especially the plasticity, of TWIP steels. According to reports, the elongation after fracture of TWIP steel assisted by Cr and N is only about 33%. When the Cr content is increased from 1% to 4%, the elongation after fracture is further reduced to about 30%, which is much lower than that of the general Fe-Mn-Al-Si and Fe-Mn-C TWIP steels (A≥70 %). Therefore, while improving the corrosion resistance of TWIP steel by Cr alloying, it is necessary to systematically study the stability of austenite structure, stacking fault energy, deformation mechanism and changes in mechanical properties to reduce the negative effects of Cr.
另一方面，TWIP钢较低的强度特别是屈服强度也使之疲劳寿命偏低，难以满足周期性疲劳载荷作用下的服役需求。虽然通过冷轧等变形强化工艺可在一定程度上提高TWIP钢的屈服强度和抗拉强度，但这种强化方式使材料的韧性损失较大，同样不利于材料的抗疲劳性能。因此，要改善TWIP钢的抗疲劳性能，须在提高其强度的同时，尽可能保持其高韧性。对于TWIP来说，所采取的合金设计获工艺手段应对孪生变形机制的影响尽可能小，从而尽可能大地抑制位错滑移引起的局部高应力或滑移位错在晶界处塞积引起的应力集中，以使材料同时获得高强、高韧的综合性能。On the other hand, the lower strength, especially the yield strength, of TWIP steel also makes its fatigue life relatively low, making it difficult to meet the service requirements under cyclic fatigue loads. Although the yield strength and tensile strength of TWIP steel can be improved to a certain extent through deformation strengthening processes such as cold rolling, this strengthening method causes a large loss of toughness of the material, which is also detrimental to the fatigue resistance of the material. Therefore, in order to improve the fatigue resistance of TWIP steel, it is necessary to maintain its high toughness as much as possible while increasing its strength. For TWIP, the alloy design and process methods adopted should have as little effect on the twinning deformation mechanism as possible, so as to suppress the local high stress caused by dislocation slip or the accumulation of slip dislocations at the grain boundary as much as possible. The stress is concentrated, so that the material can obtain the comprehensive properties of high strength and high toughness at the same time.
根据上述原理，本发明通过以下两种方法提高TWIP的耐蚀性和抗疲劳性能：(1)通过高Mn，保证材料具有合适的层错能，产生孪生诱发塑性效应。(2)通过添加Cr获得晶粒表面钝化膜；加入N扩大奥氏体相的溶C能力，减小C析出的倾向；加入Ti、Nb等稳定基体中的C，抑制含Cr碳化物的析出，以提高TWIP钢的耐蚀性。(3)利用高C、高N的组合及其相对含量控制，结合适当的固溶、时效热处理，获得理想的固溶强化和沉淀强化效果，以补偿Cr合金化带来的材料力学性能的退化，提高TWIP钢的强韧性和抗疲劳性能。According to the above principles, the present invention improves the corrosion resistance and fatigue resistance of TWIP by the following two methods: (1) High Mn ensures that the material has suitable stacking fault energy, resulting in twinning-induced plasticity effect. (2) The passivation film on the grain surface is obtained by adding Cr; the addition of N expands the C-dissolving ability of the austenite phase and reduces the tendency of C to precipitate; the addition of Ti, Nb and other stable C in the matrix inhibits the formation of Cr-containing carbides Precipitation to improve the corrosion resistance of TWIP steel. (3) Using the combination of high C and high N and their relative content control, combined with appropriate solid solution and aging heat treatment, the ideal solid solution strengthening and precipitation strengthening effects can be obtained to compensate for the degradation of material mechanical properties caused by Cr alloying. , to improve the toughness and fatigue resistance of TWIP steel.
发明内容SUMMARY OF THE INVENTION
本发明目的在于提供一种抗疲劳耐腐蚀孪生诱发塑性钢的制备方法。通过C、Mn、Cr、N、Ti和Nb的综合设计，结合适当的固溶和时效热处理，获得所需的奥氏体基体和强化相弥散分布的组织，实现材料抗疲劳性能和耐蚀性能同时提高的目标。The purpose of the present invention is to provide a preparation method of anti-fatigue and corrosion-resistant twinning induced plasticity steel. Through the comprehensive design of C, Mn, Cr, N, Ti and Nb, combined with appropriate solid solution and aging heat treatment, the required austenite matrix and the structure of the dispersion distribution of the strengthening phase can be obtained, and the fatigue resistance and corrosion resistance of the material can be achieved. while improving the target.
为了实现上述目的，本发明采用如下技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
一种抗疲劳耐腐蚀孪生诱发塑性钢的制备方法，包括以下步骤：A preparation method of fatigue-resistant and corrosion-resistant twinning-induced plasticity steel, comprising the following steps:
(1)熔炼：将原料单质C、Mn、Cr、N、Ti、Nb按目标成分进行配料，将配好的原料投入到真空感应冶炼炉内，在氩气保护下进行熔炼，熔炼结束后浇注成钢锭。(1) Smelting: The raw materials C, Mn, Cr, N, Ti, and Nb are batched according to the target components, and the prepared raw materials are put into the vacuum induction smelting furnace, smelted under the protection of argon, and poured after the smelting is completed. into steel ingots.
(2)高温拔长：将步骤(1)获得的钢锭进行表面车削加工，加工量2～5mm，车削后的钢锭经900～1100℃均匀化处理后，按锻比10～45将钢锭沿轴向拔长成直径30～40mm的圆坯，然后截成长800～1000mm的圆棒。(2) Elongation at high temperature: the steel ingot obtained in step (1) is subjected to surface turning processing with a processing amount of 2 to 5 mm. After the turned steel ingot is homogenized at 900 to 1100 ° C, the steel ingot is moved along the shaft according to the forging ratio of 10 to 45. It is drawn into a round billet with a diameter of 30-40mm, and then cut into a round bar with a length of 800-1000mm.
(3)热轧管：将步骤(2)获得的棒料加热至950～1100℃，保温0.5～1.0h，然后轧制成壁厚0.8～2.5mm、外径8.0～15.0mm、长度不限的管材。轧制过程中可根据板坯硬化情况进行中间软化退火，退火温度950～1100℃，保温时间0.5～1.0h。(3) Hot-rolled tube: heat the bar obtained in step (2) to 950-1100°C, keep the temperature for 0.5-1.0h, and then roll it into a wall thickness of 0.8-2.5mm, an outer diameter of 8.0-15.0mm, and an unlimited length. of pipes. During the rolling process, intermediate softening annealing can be carried out according to the hardening of the slab.
(4)高温锻板：将步骤(1)获得的钢锭进行表面车削加工，加工量2～5mm，车削后的钢锭经900～1100℃均匀化处理后，按锻比5～8将钢锭沿轴向锻打成厚30～40mm、宽200～300mm、长≥600mm的板坯。(4) High temperature forging plate: the steel ingot obtained in step (1) is subjected to surface turning processing, and the processing amount is 2-5 mm. After the turned steel ingot is homogenized at 900-1100 ℃, the steel ingot is moved along the shaft according to the forging ratio of 5-8. It is forged into slabs with a thickness of 30 to 40 mm, a width of 200 to 300 mm and a length of ≥ 600 mm.
(5)热轧板：将步骤(3)获得的板坯加热至950～1100℃，保温0.5～1.0h，然后轧制成厚8～10mm、宽500～600mm、长度不限的板坯。轧制过程中可根据板坯硬化情况进行中间软化退火，退火温度950～1100℃，保温时间0.5～1.0h。(5) Hot-rolled sheet: the slab obtained in step (3) is heated to 950-1100° C., kept for 0.5-1.0 h, and then rolled into a slab with a thickness of 8-10 mm, a width of 500-600 mm, and an unlimited length. During the rolling process, intermediate softening annealing can be carried out according to the hardening of the slab.
(6)冷轧板：将步骤(4)获得的板坯在室温下轧制成厚0.5～2.0mm、宽500～600mm、长度不限的薄板。(6) Cold-rolled sheet: the slab obtained in step (4) is rolled at room temperature into a thin sheet with a thickness of 0.5-2.0 mm, a width of 500-600 mm, and an unlimited length.
所述的一种抗疲劳耐腐蚀孪生诱发塑性钢的制备方法，其特征在于：所述的目标成分如下(wt.％)：C：0.20～0.50；Mn：20～30；Cr：12～18；Si：0.5～0.8；Ti：0.10～0.25；Nb：0.10～0.25；N：0.3～0.8；其余为Fe。The method for preparing anti-fatigue and corrosion-resistant twinning-induced plasticity steel is characterized in that: the target components are as follows (wt.%): C: 0.20-0.50; Mn: 20-30; Cr: 12-18 ; Si: 0.5-0.8; Ti: 0.10-0.25; Nb: 0.10-0.25; N: 0.3-0.8; the rest are Fe.
本发明还提供了根据上述制备方法加工出的具有高强韧、抗疲劳、耐腐蚀的孪生诱发塑性钢。The present invention also provides twin-induced plasticity steel with high strength, toughness, fatigue resistance and corrosion resistance processed according to the above preparation method.
本发明有益效果如下：The beneficial effects of the present invention are as follows:
本发明针对TWIP钢较低的强度、疲劳寿命及耐蚀性等缺点，以及现有强化和钝化工艺的不足，首先采用高Mn、高C和高Cr的合金设计，再通过添加N、Ti和Nb等辅助合金元素，同时结合适当的固溶、时效热处理，使TWIP钢获得理想的强化效果和钝化效应，从而保证材料具有良好的强韧性、抗疲劳性能和耐蚀性能。Aiming at the shortcomings of TWIP steel such as low strength, fatigue life and corrosion resistance, as well as the deficiencies of the existing strengthening and passivation processes, the invention first adopts the alloy design of high Mn, high C and high Cr, and then adds N and Ti to the alloy design. Auxiliary alloying elements such as Nb and Nb, combined with appropriate solid solution and aging heat treatment, make TWIP steel obtain ideal strengthening effect and passivation effect, thereby ensuring that the material has good strength and toughness, fatigue resistance and corrosion resistance.
本发明制得的孪生诱发塑性钢具有高强韧性、高疲劳寿命和高耐蚀性。具体特点如下：The twin-induced plasticity steel prepared by the invention has high strength and toughness, high fatigue life and high corrosion resistance. The specific features are as follows:
(1)主要化学成分为(wt.％)：C：0.20～0.50；Mn：20～30；Cr：12～18；Si：0.5～0.8；Ti：0.10～0.25；Nb：0.10～0.25；N：0.3～0.8；其余为Fe。(1) The main chemical components are (wt.%): C: 0.20-0.50; Mn: 20-30; Cr: 12-18; Si: 0.5-0.8; Ti: 0.10-0.25; Nb: 0.10-0.25; N : 0.3 to 0.8; the rest are Fe.
(2)金相组织为：尺寸可调的等轴奥氏体晶粒及其均匀分布的第二相颗粒，其中奥氏体等轴晶直径100～1000μm，第二相颗粒直径0.1～0.5μm，体积分数1～5％。(2) The metallographic structure is: equiaxed austenite grains with adjustable size and uniformly distributed second phase grains, wherein the diameter of austenite equiaxed grains is 100-1000 μm, and the diameter of the second phase grains is 0.1-0.5 μm , the volume fraction is 1 to 5%.
(3)典型拉伸力学性能为：屈服强度300～650MPa，抗拉强度780～860MPa，断后伸长率40～60％。(3) Typical tensile mechanical properties are: yield strength 300-650MPa, tensile strength 780-860MPa, elongation after fracture 40-60%.
(4)典型疲劳性能为：最大应力为550MPa时，疲劳寿命为1010；疲劳寿命为106时，可承受的疲劳载荷为690MPa；疲劳极限(承受107次循环不发生断裂的最大载荷)为660MPa。(4) The typical fatigue properties are: when the maximum stress is 550MPa, the fatigue life is 10 10 ; when the fatigue life is 10 6 , the fatigue load that can be endured is 690 MPa; the fatigue limit (the maximum load that does not break for 10 7 cycles) is 660MPa.
(5)耐蚀性：室温下在5wt.％NaCl溶液中浸泡700～1000h后无明显锈蚀，耐蚀性与1Cr18Ni9Ti不锈钢相当。(5) Corrosion resistance: There is no obvious rust after immersion in 5wt.% NaCl solution for 700-1000h at room temperature, and the corrosion resistance is equivalent to that of 1Cr18Ni9Ti stainless steel.
附图说明Description of drawings
图1：普通TWIP钢的典型晶粒组织；Figure 1: Typical grain structure of ordinary TWIP steel;
图2：本实施例获得的抗疲劳耐蚀TWIP钢的典型晶粒组织；Figure 2: Typical grain structure of the fatigue-resistant and corrosion-resistant TWIP steel obtained in this example;
图3：普通TWIP钢的典型拉伸应力应变曲线及性能；Figure 3: Typical tensile stress-strain curves and properties of common TWIP steel;
图4：国产1Cr18Ni9Ti不锈钢的典型拉伸应力应变曲线及性能；Figure 4: Typical tensile stress-strain curve and properties of domestic 1Cr18Ni9Ti stainless steel;
图5：进口1Cr18Ni9Ti不锈钢的典型拉伸应力应变曲线及性能；Figure 5: Typical tensile stress-strain curve and properties of imported 1Cr18Ni9Ti stainless steel;
图6：本实施例获得的TWIP钢的典型拉伸应力应变曲线及性能：(a)固溶态；(b)冷轧+热处理态；Figure 6: Typical tensile stress-strain curves and properties of TWIP steel obtained in this example: (a) solid solution state; (b) cold rolling + heat treatment state;
图7：本实施例获得的TWIP钢疲劳寿命及其与不锈钢的对比；Figure 7: Fatigue life of TWIP steel obtained in this example and its comparison with stainless steel;
图8：本实施例获得的孪生诱发塑性钢极化曲线及其与1Cr18Ni9Ti不锈钢的对比。Figure 8: The polarization curve of twin-induced plasticity steel obtained in this example and its comparison with 1Cr18Ni9Ti stainless steel.
具体实施方式Detailed ways
实施例1Example 1
高抗疲劳性能和耐蚀性能TWIP钢，其主要化学成分为(wt.％)：C：0.31；Mn：24.9；Cr：12.2；N：0.40％；Ti：0.10；Nb：0.12；其余为Fe。High fatigue resistance and corrosion resistance TWIP steel, its main chemical composition is (wt.%): C: 0.31; Mn: 24.9; Cr: 12.2; N: 0.40%; Ti: 0.10; Nb: 0.12; the rest is Fe .
制备方法如下：The preparation method is as follows:
(1)按目标成分进行配料，在真空感应电炉内、氩气保护下进行熔炼，熔炼结束后浇注成钢锭；(1) carry out batching according to the target composition, carry out smelting in a vacuum induction furnace under the protection of argon gas, and pour into a steel ingot after smelting;
(2)钢锭表面车削加工量为2mm，经1000℃高温锻造和切割，得到直径40mm、长1000mm的圆棒。(2) The amount of turning of the surface of the steel ingot is 2mm, and after forging and cutting at a high temperature of 1000°C, a round bar with a diameter of 40mm and a length of 1000mm is obtained.
(3)将上述圆棒在电阻炉内加热、保温后水冷。升温速率10℃/min，保温温度1200℃，保温时间24小时。(3) The above-mentioned round bar is heated in a resistance furnace, kept warm, and then water-cooled. The heating rate was 10°C/min, the holding temperature was 1200°C, and the holding time was 24 hours.
(4)将上述高温固溶处理后的圆棒在电阻炉内加热，保温后水冷。保温温度600℃，保温时间8小时。(4) The round bar after the above-mentioned high-temperature solution treatment is heated in a resistance furnace, and water-cooled after heat preservation. The holding temperature was 600°C, and the holding time was 8 hours.
拉伸机械性能测试试棒：从上述热处理后的圆棒沿轴向取样，用线切割加工成哑铃形板状拉伸试棒。试棒长度为110mm，标距段尺寸为6×2×40mm。Test bar for tensile mechanical properties: Take samples from the above-mentioned round bar after heat treatment in the axial direction, and process it into a dumbbell-shaped plate-shaped tensile test bar by wire cutting. The length of the test bar is 110mm, and the size of the gauge length is 6×2×40mm.
疲劳性能测试试棒：从上述热处理后的圆棒沿轴向取样，用线切割加工成哑铃形板状拉伸疲劳试棒。试棒长164mm，标距段长80mm、圆弧半径104mm。测试前将试棒表面打磨、抛光，粗糙度≤3.2。Fatigue performance test bar: sampled from the above-mentioned round bar after heat treatment in the axial direction, and processed into a dumbbell-shaped plate-shaped tensile fatigue test bar by wire cutting. The test rod is 164mm long, the gauge length is 80mm, and the arc radius is 104mm. The surface of the test bar is ground and polished before the test, and the roughness is ≤3.2.
拉伸机械性能测试：在材料试验机上进行单向拉伸试验。拉伸速率为3mm/min，测得材料的屈服强度、抗拉强度、断后伸长率以及拉伸应力应变曲线。Tensile mechanical property test: uniaxial tensile test was carried out on a material testing machine. The tensile rate was 3 mm/min, and the yield strength, tensile strength, elongation after fracture and tensile stress-strain curve of the material were measured.
疲劳性能测试：在高频疲劳试验机上进行拉拉疲劳试验。施加载荷频率为92Hz，载荷波形为正弦波形，疲劳载荷比R为0.1。Fatigue performance test: The tensile fatigue test was carried out on a high-frequency fatigue testing machine. The applied load frequency is 92 Hz, the load waveform is sinusoidal, and the fatigue load ratio R is 0.1.
对比用的普通TWIP钢和1Cr18Ni9Ti不锈钢从相关产品上取样，加工方法和试棒尺寸与本发明TWIP钢相同。The ordinary TWIP steel and 1Cr18Ni9Ti stainless steel used for comparison are sampled from related products, and the processing method and test bar size are the same as the TWIP steel of the present invention.
普通TWIP、1Cr18Ni9Ti不锈钢及本发明TWIP钢的屈服强度、抗拉强度和断后伸长率分别如附图4、5和6所示；抗疲劳性能如附图7所示；耐蚀性能分别如附图8所示。The yield strength, tensile strength and elongation after fracture of ordinary TWIP, 1Cr18Ni9Ti stainless steel and TWIP steel of the present invention are shown in accompanying
本发明制备得到的TWIP钢与普通TWIP钢及1Cr18Ni9Ti不锈钢的主要性能对比如表1、表2和表3所示。Table 1, Table 2 and Table 3 show the comparison of the main properties of the TWIP steel prepared by the present invention with ordinary TWIP steel and 1Cr18Ni9Ti stainless steel.
表1主要力学性能对比Table 1 Comparison of main mechanical properties
表2耐蚀性对比Table 2 Corrosion resistance comparison
表3疲劳性能对比Table 3 Comparison of fatigue properties
由表1可以看出，本发明提供的抗疲劳耐腐蚀TWIP钢，与普通TWIP钢和1Cr18Ni9Ti不锈钢相比，具有更高的屈服强度和抗拉强度以及与前者相近的塑性和与后者相近的耐蚀性。由于具有优异的综合力学性能，本发明提供的TWIP钢显示出非常突出的抗疲劳性能。无论是疲劳极限、相同载荷疲劳寿命，还是相同寿命疲劳载荷，均明显优于1Cr18Ni9Ti不锈钢。因此，在提高结构强韧性、抗疲劳性和耐蚀性等方面，本发明提供的TWIP钢具有突出的优点，将有助于解决普通TWIP钢或不锈钢存在的强韧性不足或耐蚀性较差的根本性问题。As can be seen from Table 1, the fatigue-resistant and corrosion-resistant TWIP steel provided by the present invention has higher yield strength and tensile strength as well as plasticity similar to the former and similar ductility to the latter compared with ordinary TWIP steel and 1Cr18Ni9Ti stainless steel. Corrosion resistance. Due to the excellent comprehensive mechanical properties, the TWIP steel provided by the present invention shows very outstanding fatigue resistance. Whether it is the fatigue limit, the fatigue life of the same load, or the fatigue load of the same life, it is obviously better than 1Cr18Ni9Ti stainless steel. Therefore, the TWIP steel provided by the present invention has outstanding advantages in improving structural strength and toughness, fatigue resistance and corrosion resistance, and will help to solve the problems of insufficient strength and toughness or poor corrosion resistance of ordinary TWIP steel or stainless steel. fundamental problem.
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| CN106148660A (en) * | 2016-07-05 | 2016-11-23 | 中国科学院合肥物质科学研究院 | A kind of preparation method of deformed grains/partial, re-crystallization tissue twinning-induced plasticity steel |
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