Strain-induced ε-martensitic transformation and hydrogen embrittlement of SUS304 stainless steel.

Autor:	Hatano, M., Tsukasaki, H., Kawaguchi, A., Kawaguchi, S., Kubota, Y., Ishii, Y., Mori, S.
Předmět:	HYDROGEN embrittlement of metals MARTENSITIC transformations SYNCHROTRON radiation BRITTLE fractures AUSTENITIC stainless steel IRON-manganese alloys STAINLESS steel
Zdroj:	Philosophical Magazine Letters; Nov2019, Vol. 99 Issue 11, p404-413, 10p
Abstrakt:	We examined the hydrogen embrittlement mechanism in SUS304 stainless steel by conducting synchrotron radiation diffraction experiments and high-resolution TEM observations. It was found that the strength of SUS304 was lowered by adding hydrogen and that brittle fracture occurred with elongation of approximately 20%. Synchrotron radiation diffraction experiments revealed that the formation of the ε phase having a hexagonal close-packed structure was promoted by hydrogen addition to SUS304. In addition, high-resolution TEM observations revealed the presence of the ε phase with a width of up to approximately 5 nm at the twin boundary in the twin structure due to the γ phase. Furthermore, a large number of stacking faults were formed in the ε phase. These results imply that the strain-induced martensitic phase transformation from the γ phase to the α′ one was suppressed by hydrogen addition to SUS304 and that the ε phase having a large number of stacking faults was stabilised as an intermediate phase during the α′ martensitic phase transformation. The formation of the ε phase having a large number of stacking faults should presumably originate in hydrogen embrittlement. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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