INFLUENCE OF PRE-TRANSFORMED MARTENSITE ON KINETICS OF BAINITIC TRANSFORMATION IN GCr15 STEEL

Acta Metall Sin

1991, Vol. 27

Issue (1): 16-19 DOI:

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INFLUENCE OF PRE-TRANSFORMED MARTENSITE ON KINETICS OF BAINITIC TRANSFORMATION IN GCr15 STEEL

LI Chao;WANG Jianli;LIU Jinfang Harbin Institute of Technology

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LI Chao;WANG Jianli;LIU Jinfang Harbin Institute of Technology. INFLUENCE OF PRE-TRANSFORMED MARTENSITE ON KINETICS OF BAINITIC TRANSFORMATION IN GCr15 STEEL. Acta Metall Sin, 1991, 27(1): 16-19.

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Abstract The kinetics of bainitic transformation of GCr15 steel below M_s andthe influence of the pre-transformed martensite formed at different temperatures onit at 240℃ isothermally have been investigated by means of magnetic measurementand dilatometry. The supercooled austenite transforms firstly into martensite and thenlower bainite during isothermal process below M_s. With the decrease of isothermaltemperature and the increase of pre-transformed martensite, the bainitic transforma-tion is accelerated by stress-induction effect, and the incubation period is the shor-test at about 200℃. However, the bainitic transformation becomes rather difficult,if the temperature is continued to decrease and the pre-transformed martensite exce-eds a certain limit. Moreover, it seems in a similar manner of the pre-transformedmartensite increased at different temperatures below M_s to be influenced on the su-bsequent bainitic transformation at 240℃ isothermally.

Key words: pre-transformation martensite bainite transformation kinetics

Received: 18 January 1991

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1991/V27/I1/16

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