Temper Embrittlement and Pine Cone Like Fracture Surface of 5.5% Ni Cryogenic Steels
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概要
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Pine cone like fracture surface ("pine cone") is observed in some ferritic steels containing retained austenite when temper embrittled. Microscopic observations and various mechanical tests are performed to elucidate the characteristics of this fracture surface by using 5.5% Ni steels.It is found that "pine cone" is the intergranular fracture surface produced by fracture along P-segregated martensite/austenite interfaces which form at prior austenitic grain boundaries and its pine cone like surface is caused by the reverted austenites at the grain boundaries.Intercritical temper promotes austenite formation thereby enhances the irregularity of the grain boundary and reduces the, fraction of intergranular fracture or "pine cone".It is also found through Mössbauer spectroscopy that the retained austenite at the grain boundaries transforms to martensite during fracture.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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