著者

松田 昭一 岡村 義弘

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.60, no.2, pp.226-238, 1974-02-01

被引用文献数

1 1

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The process of formation of austenite has been studied in low-carbon low alloy steels. The specimens with acicular structures such as martensite, bainite or tempered martensite are heated at temperatures between A_<C1> and A_<C3>. The structual changes in these specimens during heating are observed in detail. The main results are as follows. 1) Austenitizing processes are divided into two stages. In the first stage globular austenites are formed accompanying the dissolution of cementite. Acicular austenites are as well formed at an early stage. 2) In the second stage a globular austenite is formed by the coalescence of the acicular austenite grains and those formed in the both stages grow to form extended austenite grains. 3) γ' transformation prevails in a boron containing steel. Based on these results, it is proposed that the reverse transformation are mainly controlled by the rate of recrystallization of austenite.