Influence of the Austenitizing State on the Continuous Cooling Transformation Characteristics of Steel

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  • 鋼のオーステナイト化状態が連続冷却変態挙動におよぼす影響
  • コウ ノ オーステナイトカ ジョウタイ ガ レンゾク レイキャク ヘンタイ キョドウ ニ オヨボス エイキョウ

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Abstract

The effect of austenitizing temperatures, from 800°C to 1000°C, on (a) the transformation regions in the CCT diagram and (b) the critical cooling rates for various amounts of bainite and pearlite formation, has been determined for a 0.6%C Cr-Mo-V low-alloy steel with bainitic hardenability. The observations on the variation in the state of austenite with austenitizing conditions were also conducted. The relation between the transformation characteristics and the state of austenite was discussed. The austenite grain size affected pearlite-range transformation remarkably, but its effect on bainite and martensite transformation was very small. The effect of a small amount of undissolved carbide which was observed when austenitizing temperatures were low existed in two ways: One was the decrease in the alloy content, especially the lowering of the C content in the austenite matrix, which accelerated both pearlite and bainite transformations and raised the Ms temperature. The other was the accelerating effect arising from the existence of carbide itself. This effect was observed in the bainite transformation as the increase in critical cooling rates for the small amount of transformation and the elevation of transformation temperature.

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