冷作硬化非调质钢的连续冷却相变规律

doi:10.13228/j.boyuan.issn0449-749x.20210531

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Abstract The continuous cooling transformation(CCT) law of steel is the basic basis of microstructure regulation. In order to optimize the microstructure and mechanical properties of cold work hardening non-quenched steel for fasteners in hot rolling state,the thermal expansion curves of the test steel at cooling rates 0.1-50 ℃/s was measured by DIL805A phase transformation instrument,combined with metallographic hardness method to determine the transformation type,and draw the static CCT curve of the test steel. The results show that the martensite transformation point (M_s) of the test steel is 280 ℃,and ferrite is formed in different cooling rate ranges. With the increase of cooling rate,the transition temperature of ferrite and pearlite decreases,and the content and grain size of ferrite decrease. Cooling rate less than 3 ℃/s,the room temperature microstructure is composed of proeutectoid ferrite and pearlite,and the hardness changes little with the increase of cooling rate,which is 156-166HV. When the cooling rate reaches 3 ℃/s,bainite and martensite begin to appear,and the hardness increases rapidly to 181HV. When the cooling rate is greater than 3 ℃/s,the content of proeutectoid ferrite and pearlite decrease gradually,the content of bainite and martensite increase,and the hardness increase continuously. When cooling rate is 30-50 ℃/s,the microstructure is mainly bainite and martensite.Nb and V play important roles in the continuous phase transition. The precipitation behavior of Nb and V carbonitride in the test steel was calculated by Thermo-Calc software. The total solid solution temperatures of V (C,N) and Nb (C,N) were 780 ℃ and 1 144 ℃ respectively. Under the condition of austenitizing at 900 ℃,V(C,N) is completely solid solution,and Nb(C,N) is solid solution by 8%. Because the diffusion rate of Nb and V is much slower than that of C,the solid solution Nb and V have no time to diffuse in the cooling transformation process and gather at the two-phase interface,reducing the growth rate of ferrite,inhibiting the formation of ferrite and promoting bainite or martensite transformation.

Key words： non-quenched and tempered steel continuous cooling transformation microstructure cold work hardening Nb、V carbonitride

Received: 01 September 2021

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	Articles by authors
	JIANG Chang
	WANG Zi-bo
	WANG Yang
	LU Heng-chang
	MAN Ting-hui
	ZHOU Lei

Cite this article:

JIANG Chang,WANG Zi-bo,WANG Yang等. Continuous cooling transformation law of cold work hardening non-quenched and tempered steel[J]. Iron and Steel, 2022, 57(3): 91-96.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210531 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I3/91

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