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Hydrogen embrittlement of a Ti-strengthened 250 grade maraging steel

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Abstract

Constant extension-rate tensile tests are performed to investigate the effects of strain rate and environmental hydrogen concentration on the tensile properties of various aged T-250 specimens. The 426 °C (800 °F) underaged specimens are very sensitive to strain rate; the 482 °C (900 °F) peak-aged specimens exhibit a reduced ductility under low strain rates; and the 593 °C (1100 °F) overaged specimens are insensitive to strain rate when tested in air. The excellent resistance to embrittlement of the overaged specimens in gaseous hydrogen could be associated with the extensive formation of reverted austenite and the incoherent Ni3Ti precipitates. The tensile-fractured surfaces of such specimens reveal a ductile dimple fracture. However, the peak-aged specimens are susceptible to gaseous hydrogen embrittlement, and the embrittled region shows a primary fracture mode of quasi-cleavage. The least resistant to hydrogen embrittlement of the underaged specimens is characterized by a more brittle fracture appearance, that is, intergranular fracture, under a low strain rate or in the gaseous hydrogen environment.

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Authors and Affiliations

  1. Institute of Materials Engineering, National Taiwan Ocean University, Keelung, Taiwan, R.O.C

    L. W. Tsay & W. B. Huang

  2. Chung Shan Institute of Science and Technology, Lungtan, Taiwan, R.O.C

    Y. M. Li

  3. Institute of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan, R.O.C

    C. Chen

Authors
  1. L. W. Tsay
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  2. W. B. Huang
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  3. Y. M. Li
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  4. C. Chen
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Tsay, L.W., Huang, W.B., Li, Y.M. et al. Hydrogen embrittlement of a Ti-strengthened 250 grade maraging steel. J. of Materi Eng and Perform 6, 177–181 (1997). https://doi.org/10.1007/s11665-997-0011-6

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  • DOI: https://doi.org/10.1007/s11665-997-0011-6

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