钒及奥氏体化温度对Mn-Cr系贝氏体型非调质钢过冷奥氏体连续冷却转变行为的影响

doi:10.11896/cldb.19090164

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Abstract The present study was attempted to explore the effects of V and austenitizing temperature on continuous cooling transformation (CCT) beha-vior of bainitic forging steel. Mn-Cr type bainitic forging steels microalloyed with V (0.13wt%) and without V (0wt%) were austenitized at three different temperatures (900℃, 1 050℃ and 1 150℃) and then continuously cooled by using thermal dilatometer to study their CCT beha-vior. Microstructural observations and Vickers hardness measurements of the cooled samples were carried out as complements for the accurate plot of the CCT diagrams. The results show that both V and austenitizing temperature have significant influence on the CCT diagrams. It was difficult to obtain full bainitic (≥90vol% bainite) microstructure when austenitizing temperature was 900℃, while it could be obtained at relatively lower cooling rate when the austenitizing temperature was raised to 1 050℃ and 1 150℃. When austenitizing temperature was 900℃, V showed notable effect on the CCT diagram and the cooling rate range obtaining bainite was broadened and the bainite fraction was enhanced. When the austenitizing temperature was increased to 1 050℃ and 1 150℃, the lowest cooling rate obtaining full bainitic microstructure was lo-wered from 0.86℃/s to 0.43℃/s for austenitizing temperature of 1050℃ and from 0.26℃/s to 0.16℃/s for austenitizing temperature of 1 050℃, and the bainitic transformation range was broadened to as low as 0.08℃/s by the addition of V. It is also found that the hardness was increased by the addition of V and this increase degree depends on austenitizing temperature and cooling rate. A peak value of hardness increase as high as 66HV5 at cooling rate of 0.88℃/s could be obtained for austenitizing temperature of 900℃, while the peak value of hardness increase was significantly decreased to 38HV5 at cooling rate of 0.17℃/s for austenitizing temperature of 1 050℃ and to 30HV5 at cooling rate of 0.08℃/s for austenitizing temperature of 1 150℃.

Key words： bainitic forging steel vanadium austenitizing temperature continuous cooling transformation microstructure

Published: 12 September 2020

CLC number:

TG142.1

Fund:This work was financially supported by the National Key Research & Development Program of China (2016YFB0300100).

About author:: Zhanhua Wang, female, born in 1989, doctoral student, she mainly focus on the research of high performance auto-motive steel.
Weijun Huiis a professor and doctoral supervisor at the School of Mechanical, Electronic and Control Enginee-ring of Beijing Jiaotong University and director of Mate-rials Science and Engineering Research Center. His research interests are advanced high-strength steels and their fatigue and environmental performance. He has published more than 230 papers.

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	WANG Zhanhua
	HUI Weijun
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	ZHAO Xiaoli

Cite this article:

WANG Zhanhua,HUI Weijun,CHEN Zhen, et al. Effects of Vanadium and Austenitizing Temperature on Continuous Cooling Transformation Behavior of Mn-Cr Type Bainitic Forging Steels[J]. Materials Reports, 2020, 34(18): 18145-18151.

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http://www.mater-rep.com/EN/10.11896/cldb.19090164 OR http://www.mater-rep.com/EN/Y2020/V34/I18/18145

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