鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
相変態・材料組織
Fe-Mn合金におけるHCP,FCC相の安定性に及ぼす冷間圧延の影響
奥田 金晴許 皛貝沼 亮介
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2019 年 105 巻 5 号 p. 530-539

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The phase transformation behavior during heating process after various cold-rolling reductions was investigated for Fe - 20% Mn alloy and the phase stabilities of γ and ε phases were discussed. The initial hot-rolled material was composed of ε martensite matrix and a small amount of γ austenite phase at room temperature. The deformation of the martensite alloy in cold rolling was not homogeneous and the microstructure in some regions was clearly inherited from that in the hot rolled sample. Moreover, the residual γ phase was still detected even after 35% cold rolling reduction. In the heating stage, the reverse transformation to the γ phase remarkably started at 200ºC or higher and the reverse transformation finishing temperature obviously rose with rolling reduction ratio. However, it was confirmed by in-situ XRD and EBSD observation that the reverse transformation had already started from the residual γ phase particles even at temperatures below 200 ºC. In addition, from the EBSD-IQ map, distribution of dislocations was considered to remain even in the γ phase after the reverse transformation.

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© 2019 一般社団法人 日本鉄鋼協会
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