オーステナイト結晶粒の生成過程に関する観察

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Some observations have been conducted on the formation of austenite grains from ferrite-pearlite and martensite structures heated at 2℃/min and 2℃/sec, using a low carbon chromium steel. It is found that heating of ferrite-pearlite at either heating rate gives rise to the nucleation of austenite at ferrite-pearlite interfaces and pearlite colony boundaries and its granular growth and finally the granular austenite goes into an initial austenite grain after the completion of α⟶γ transformation. It is also indicated that heating of martensite at 2℃/sec produces small amount of acicular austenite and much amount of granular austenite at prior austenite grain boundaries and grain interior which grows integrating acicular one and goes into initial austenite grain after the completion of the transformation. Slow heating of martensite at 2℃/min however, brings the different process of formation of initial austenite grains, that is, much amount of acicular austenite is created in the prior austenite grain interior along with granular one at the boundaries which comes to compose a lamellar structure of austenite and acicular ferrite. Vanishing of acicular ferrite by completion of the transformation results in acicular subgrains of austenite which are very unstable owing to the high grain boundary area and thus a subgrain acquiring enough energy grows rapidly, sweeping the other subgrain boundaries, resulting in granular austenite grain. Migration of austenite-ferrite interface is found to be inhibited at ferrite boundaries and thus it is proposed that growth of granular austenite in martensite may be performed by sympathetic nucleation of austenite.
社団法人日本鉄鋼協会の論文
1973-08-01

オーステナイト結晶粒の生成過程に関する観察

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