Abstract
Sumitomo Metal Industries, Ltd., Kashima 3140014The fracture behavior of a high nitrogen bearing austenitic stainless steel(Fe23Cr4Ni2Mo1N(mass))at cryogenictemperature was investigated by 3DSEMEBSD method, electron microscopy, Xray diffraction and thermodynamic evaluationof phase stability. DuctiletoBrittle Transition (DBT)was found to occur as a result of brittle fracture in the present steel. Thebrittle fracture took place on{111}with a high Schmid factor, which likely proceeded in the slippingoff mechanism on the mostactive {111}. Although the stressinduced martensitic transformation occurs, its contribution seems to be negligible.
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