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Hydrogen Attack kinetics of 2.25 Cr-1 Mo steel weld metals

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Abstract

The kinetics of Hydrogen Attack (HA) of the base metals and the weld metals of two Q&T 2.25 Cr-1 Mo steel weldments made by different techniques (SMAW and SAW) were studied in the temperature range 460 to 590°C (860 to 1094 °F) and 10 to 23 MPa of hydrogen. A sensitive dilatometer used to measure the rate of HA showed that the weld metals suffered HA at significantly higher rates than the base metals. The SMAW weld metal was inferior to the SAW weld metal and swelled nearly an order of magnitude faster than the base metal. This behavior is due to a significantly higher bubble density, and a resulting higher contribution of power law creep of the matrix. The SAW behavior was intermediate between those of the base metals and the SMAW. For the same hydrogen pressure the operating limit of the SMAW weld would be roughly 100°C lower than that of the base metals, and that of the SAW roughly 50°C lower.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, University of Illinois, 1304 West Green Street, 61801, Urbana, IL

    T. A. Parthasarathy (Assistant Professor)

  2. Saltillo Institute of Technology, Saltillo, Mexico

    H. F. Lopez

  3. 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. H. F. Lopez
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  3. P. G. Shewmon
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Parthasarathy, T.A., Lopez, H.F. & Shewmon, P.G. Hydrogen Attack kinetics of 2.25 Cr-1 Mo steel weld metals. Metall Trans A 16, 1143–1149 (1985). https://doi.org/10.1007/BF02811683

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