室温組織並びにδフェライト形態に対するレーザ急冷凝固処理の影響 : ステンレス鋼のレーザ表面改質に関する研究(第4報)

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Microstructures of stainless steels rapidly solidified by laser surface melting (LSM) were investigated. In addition to the massively solidified structure and the rod-like eutectic structure which have been reported, characteristic structures, named as film-like ferrite, and rod-like ferrite were observed in LSM treated specimen. TEM and STEM analysis have revealed that there was not specific orientation relationship like K-S relationship between rod-like ferrite and austenite matrix, while there was K-S orientation relationship between film-like ferrite and austenite matrix. Between ferrite and austenite matrix in vermicular ferrite structuer 4 or 5 degree deviation from K-S orientation direction had been observed. Segregation of elements due to solid transformation from ferrite to austenite was observed in vermicular ferrite and film-like ferrite structures, but no segregation due to solid transformation was observed in rod-like ferrite structure. From these results it was deduced that : (1) as for vermicular ferrite structure, delta ferrite is the primary phase of solidification, and austenite solidifies at the terminal stage on solidification and a diffusional solid transformation from ferrite to austenite takes place.(2) as for film-like ferrite, delta ferrite is dominant phase of solidification and a diffusional solid transformation follows with drop temperature than that of vermicular ferrite structure.(3) as for rod-like ferrite, LSM treated specimen solidifies completely to ferrite and a massive (patitionless) solid transformation from ferrite to austenite takes place during cooling.
1991-02-05

室温組織並びにδフェライト形態に対するレーザ急冷凝固処理の影響 : ステンレス鋼のレーザ表面改質に関する研究(第4報)

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