Evaluation of hydrogen-assisted cracking behavior of low-alloy steel in the range 95 °C to 350 °C |
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Authors: | Hideya Anzai Jiro Kuniya Isao Masaoka |
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Affiliation: | (1) Hitachi Research Laboratory, Hitachi Ltd., 1-1, Saiwaicho 3chome, Hitachi-shi, 317 Ibarakiken, Japan |
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Abstract: | In this report, hydrogen-assisted cracking (HAC) behavior of low-alloy steel was evaluated using a constant elongation rate
tensile test, and the temperature and crack tip strain rate effects were observed. It was found that temperature dependence
of the threshold condition (C
σm
c
) of HAC above about 100 °C followed the relation C
σm
c
= Kexp(−41,300/Rr) whereK is a constant andT is absolute temperature. The relationship between HAC growth rate and crack tip strain rate was established as almost linear,
irrespective of temperature and hydrogen concentration at the crack tip. Hydrogen heat release tests were also performed.
From these tests, formation and growth of microcracks which are trap sites of hydrogen were thought to be the mechanism of
HAC in the steel. From this mechanism, HAC behavior of the low-alloy steel could be qualitatively explained. |
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Keywords: | |
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