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Hydrogen attack behavior of the heat affected zone of a 2.25Cr-1Mo steel weldment

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Abstract

The kinetics of hydrogen attack (HA) has been studied in the heat affected zone (HAZ) in a 2.25Cr-1Mo steel weld to determine the relative rates of attack and bubble nucleation in the HAZ, base metal, and weld metal. The HAZ was found to suffer hydrogen attack at nearly twice the rate of the base metal, but not as rapidly as the weld metal. Nucleation of bubbles does not occur during HA of the HAZ of a 2.25Cr-1Mo steel, on exposure to hydrogen pressure of 20.5 MPa or less, but does occur at higher pressures up to 31.5 MPa (4500 psi) at 550 °C, or up to 27.5 MPa (4000 psi) at 580 °C. Such nucleation results in enhancement of the HA rate by a factor of six. The weak dependence of nucleation effects on hydrogen pressure and the saturation of the nucleation effects in a short time suggest some thermally activated nucleation of fresh bubbles.

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Authors and Affiliations

  1. Department of Metallurgy and Mineral Engineering, University of Illinois, 61801, Urbana, IL

    T. A. Parthasarathy (Assistant Professor)

  2. Department of Metallurgical Engineering, The Ohio State University, 43210, Columbus, OH

    P. G. Shewmon (Professor)

Authors
  1. T. A. Parthasarathy
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  2. P. G. Shewmon
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Formerly with The Ohio State University.

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Parthasarathy, T.A., Shewmon, P.G. Hydrogen attack behavior of the heat affected zone of a 2.25Cr-1Mo steel weldment. Metall Trans A 18, 1309–1312 (1987). https://doi.org/10.1007/BF02647200

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