What Is Metallurgical Engineering
What Is Metallurgical Engineering
What Is Metallurgical Engineering
Metals and mineral products surround us everywhere at home, on our way to and from work,
and in our offices or factories. They form the backbone of modern aircraft, automobiles, trains,
ships and endless recreational vehicles; buildings; implantable devices; cutlery and cookware;
coins and jewelry; firearms; and musical instruments. The uses are endless. While threats abound
from alternative material choices, metals continue to be at the forefront and the only choice for
many industrial applications.
Developing new materials, new processes to make them and testing new theories and models to
understand them are the focal points of todays metallurgist. We have the means to measure
properties at the macro, micro, nano and atomic scales, giving us unprecedented access to fuel
new developments. The strong dependence of our society on metals gives the profession of
metallurgical engineering its sustained importance in the modern world.
It is believed by most that our economic and technical progress into the 21st century will depend
in large part on further advances in metal and mineral technology. For example, advancements in
energy technologies, such as the widespread use of nuclear fusion, will only be possible by
materials developments not yet in existence. The future is indeed bright for todays material
scientists and those engineers who chose metallurgy as their career choices.
Here, bright thoughts spark bold action. We offer numerous opportunities to roll up your sleeves and
put your education to work through internships, co-ops, and research experiences. And with one of the
few specialized degree programs in the nation, industry leaders will be looking for you.
Metallurgy is a domain of materials science and engineering that studies the physical and chemical
behaviour of metallic elements, their intermetallic compounds, and their mixtures, which are
called alloys. Metallurgy is also the technology of metals: the way in which science is applied to the
production of metals, and the engineering of metal components for usage in products for consumers
and manufacturers. The production of metals involves the processing of ores to extract the metal
they contain, and the mixture of metals, sometimes with other elements, to produce alloys.
Metallurgy is distinguished from the craft of metalworking, although metalworking relies on
metallurgy, as medicine relies on medical science, for technical advancement.
Metallurgy is subdivided into ferrous metallurgy (sometimes also known as black metallurgy)
and non-ferrous metallurgy or colored metallurgy. Ferrous metallurgy involves processes and alloys
based on iron while non-ferrous metallurgy involves processes and alloys based on other metals.
The production of ferrous metals accounts for 95 percent of world metal production
The roots of metallurgy derive from Ancient Greek: , metallourgs, "worker in metal",
from , mtallon, "metal" + , rgon, "work".
The word was originally an alchemist's term for the extraction of metals from minerals, the ending -
urgy signifying a process, especially manufacturing: it was discussed in this sense in the
1797 Encyclopaedia Britannica.[2] In the late 19th century it was extended to the more general
scientific study of metals, alloys, and related processes.
In English, the /metldi/ pronunciation is the more common one in the UK and Commonwealth.
The /metlrdi/ pronunciation is the more common one in the USA, and is the first-listed variant in
various American dictionaries (e.g., Merriam-Webster Collegiate, American Heritage).
Extraction[edit]
Alloys[edit]
Casting bronze
Common
engineering metals include aluminium, chromium, copper, iron, magnesium, nickel, titanium and zinc
. These are most often used as alloys. Much effort has been placed on understanding the iron-
carbon alloy system, which includes steels and cast irons. Plain carbon steels (those that contain
essentially only carbon as an alloying element) are used in low-cost, high-strength applications
where weight and corrosion are not a problem. Cast irons, including ductile iron, are also part of the
iron-carbon system.
Stainless steel or galvanized steel are used where resistance to corrosion is important. Aluminium
alloys and magnesium alloys are used for applications where strength and lightness are required.
Copper-nickel alloys (such as Monel) are used in highly corrosive environments and for non-
magnetic applications. Nickel-based superalloys like Inconel are used in high-temperature
applications such as gas turbines, turbochargers, pressure vessels, and heat exchangers. For
extremely high temperatures, single crystal alloys are used to minimize creep.
Metalworking processes[edit]
Main article: Metalworking
laser cladding metallic powder is blown through a movable laser beam (e.g. mounted on a
NC 5-axis machine). The resulting melted metal reaches a substrate to form a melt pool. By
moving the laser head, it is possible to stack the tracks and build up a three-dimensional piece.
extrusion a hot and malleable metal is forced under pressure through a die, which shapes
it before it cools.
machining lathes, milling machines, and drills cut the cold metal to shape.
fabrication sheets of metal are cut with guillotines or gas cutters and bent and welded into
structural shape.
3D printing Sintering or melting powder metal in a very small point on a moving 'print head'
moving in 3D space to make any object to shape.
Cold-working processes, in which the products shape is altered by rolling, fabrication or other
processes while the product is cold, can increase the strength of the product by a process
called work hardening. Work hardening creates microscopic defects in the metal, which resist further
changes of shape.