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A fractographic investigation of thermal embrittlement in cast duplex stainless steel

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Abstract

The fracture surface topography analysis (FRASTA) technique under development at SRI was applied to seek an explanation for severe thermal embrittlement observed in cast duplex stainless steel. By comparing topographic features of conjugate fracture surfaces, FRASTA showed that fracture in thermally embrittled cast duplex stainless steel occurs by microcrack initiation at delta-phase grain boundaries and at alpha-phase/gamma-phase interfaces, and by microcrack growth along these boundaries and interfaces. The critical crack tip opening displacement (CTOD) as measured from cross-sectional views generated by the FRASTA technique indicated a microcrack initiation toughness,J Ic, of 287 KJ/m2, in excellent agreement with measurements using conventional fracture mechanics procedures, and significantly less than the toughness of unaged material.

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Authors and Affiliations

  1. Department of Metallurgy and Fracture Mechanics, SRI International, 94025, Menlo Park, CA

    D. A. Shockey (Director)

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  1. T. Kobayashi
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  2. D. A. Shockey
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Formerly with SRI International, Menlo Park, CA, is with the Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Japan 466.

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Kobayashi, T., Shockey, D.A. A fractographic investigation of thermal embrittlement in cast duplex stainless steel. Metall Trans A 18, 1941–1949 (1987). https://doi.org/10.1007/BF02647024

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