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Influence of austenitizing temperature on stress corrosion in 4330m steel—The role of impurity segregation in stress corrosion cracking of high strength steel

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Abstract

Measurements of the threshold stress intensity for stress corrosion cracking (SCC), KISCC, and crack growth rate,da/dt, in distilled water were made, respectively, on bolt-loaded WOL and precracked three-point-bending specimens of a 4330M steel. A significant improvement of resistance to SCC was obtained by increasing quenching temperature and it is due to a reduction of segregated impurities of P and S at prior austenite grain boundaries. Intergranular cracking tendency increases with inter-granular concentration of impurities and the fracture mode changes from intergranular separation along prior austenite grain boundaries to transgranular quasi-cleavage as the segregated impurity becomes low enough. The combined effects of hydrogen and intergranular impurities on reducing intergranular cohesion and the time for approaching the critical concentration of hydrogen are dis-cussed in terms of a dynamic model which takes into account the accumulation of hydrogen ahead of a moving microcrack.

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Authors and Affiliations

  1. Department of Materials Science, Insti- tute of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, The People’s Republic of China

    Dongliang Lin (Professor and Director) & Jiangsheng Wu (Associate Professor)

  2. Institute of Metals Physics, Technical University of Aachen, USA

    Yun Lan (Graduate Student)

Authors
  1. Dongliang Lin
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  2. Jiangsheng Wu
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  3. Yun Lan
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Formerly with Shanghai Jiao Tong University, Shanghai, China

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Lin, D., Wu, J. & Lan, Y. Influence of austenitizing temperature on stress corrosion in 4330m steel—The role of impurity segregation in stress corrosion cracking of high strength steel. Metall Trans A 19, 2225–2231 (1988). https://doi.org/10.1007/BF02645046

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  • DOI: https://doi.org/10.1007/BF02645046

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