晶粒尺寸对贝氏体钢SDP1的连续冷却转变规律的影响

doi:10.11896/j.issn.1005-023X.2017.06.018

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Abstract Continuous cooling transformation (CCT) curves of SDP1 with 150 μm and 20 μm grain size were tested by dilatometer. Based on the curves, the effect of grain size on phase transformation, microstructure and hardness of the SDP1 steel were studied by means of OM, SEM, hardness test, thermodynamic calculation and kinetic analysis.The experimental results showed that specimen with smaller grain could display lamellar pearlite in the low cooling rate conditions with hardness about 305HV and had a smaller bainitic transformation zone. The specimen with bigger grain size had no pearlite formation and bainitic transformation zone was larger with hardness about 423HV. The activation energy of bainitic transformation of specimens with grain size of 150 μm and 20 μm were 124 kJ·mol^-1 and 134 kJ·mol^-1, respectively.

Key words： pre-hardening plastic mould steel grain size phase transformation bainite CCT diagrams

Published: 02 May 2018

CLC number:

TG151.2

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	Articles by authors
	LI Xiaocheng
	ZHENG Yafeng
	WU Xiaochun

Cite this article:

LI Xiaocheng,ZHENG Yafeng,WU Xiaochun. Influence of Grain Size on Continuous Cooling Transformation Rules of a
Bainitic Steel SDP1[J]. Materials Reports, 2017, 31(6): 86-92.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.06.018 OR http://www.mater-rep.com/EN/Y2017/V31/I6/86

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