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| HYDROGEN INDUCED DELAYED CRACKING IN STABLE AUSTENITIC STAINLESS STEELS |
| by YAO Jing; CHU Wuyang; XIAO Jimei (Belling University of Iron and Steel Technology) (Manuscript received 2 September; 1982; revised manuscript 25 March; 1983) |
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Cite this article:
by YAO Jing; CHU Wuyang; XIAO Jimei (Belling University of Iron and Steel Technology) (Manuscript received 2 September; 1982; revised manuscript 25 March; 1983). HYDROGEN INDUCED DELAYED CRACKING IN STABLE AUSTENITIC STAINLESS STEELS. Acta Metall Sin, 1984, 20(2): 124-130.
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Abstract The behaviour of hydrogen induced delayed cracking (HIDC, i. e. slow crack growth) in a type 310 and a type 16-20-20 (K55) stable austenitic stainless steels along with a type 321 unstable austenitic stainless steel were investigated with a single-edge notched tensile specimen. It was found that HIDC could occur in all 3 types of stainless steels and the threshold values were K_(IH)/K_c =0.55, 0.70 and 0.80 for stainless steels 321, 310 and K-55 respectively, if the specimens were charged with load. HIDC could also occur if the precharged specimens were tested under constant load in air. No HIDC, however, occurred in the precharged and then outgassed specimens. It indicates that the delayed cracking in stable austenitic stainless steels is induced by atomic hydrogen. Because there is no hydrogen induced α' martensite in type 310 and K-55 stainless steel, the existence of α' is not necessary for the oecurrenee of HIDC in the austenitic stainless steels, though it can facilitate HIDC. The mode of hydrogen induced delayed fracture in either stable or unstable austenitie stainless steels is correlated with K_I value, the fracture surface was changed from ductile to brittle as K_I is decreased.
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Received: 18 February 1984
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