25Cr2Mo1VA钢奥氏体晶粒长大规律探讨

doi:10.13228/j.boyuan.issn0449-749x.20190290

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Abstract The austenite grain growth behavior of 25Cr2Mo1VA steel was investigated at different heating temperatures and holding time,then the grain size,distribution,precipitate type and its size distribution of austenite were adopted to study the effects of different heating temperature and holding time by metallographic microscopy,TEM,EDS and intercept method.The results shows that the austenite grain size increases with heating temperature,and the austenite grain size grows slowly under 900 ℃;but"mixed crystal" phenomenon is appeared at 950℃,subsequently the grain size of austenite grows quickly at over 1 000 ℃. In addition,it is also found that the austenite grain size slowly increases with the prolonging of holding time,but the effect is not much obvious than temperatures. And connecting with the scanning electron microscope analysis,it confirmes that the similar ball precipitation in the test steel is V-rich M₈C₇precipitated phase.According to the existing model of Anelli correction,relationship between the pinning force and the second phase particles on austenite grains,the behavior and causes of the 25Cr2Mo1VA steel grain growth are analyzed.

Key words： 25Cr2Mo1VA steel austenite grain grain size Anelli improved model

Received: 28 June 2019

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	LU Wei
	WAN Zhen-zhen
	JIN Ying

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LU Wei,WAN Zhen-zhen,JIN Ying. Austenite grain growth behavior in 25Cr2Mo1VA steel[J]. Iron and Steel, 2020, 55(3): 96-103.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190290 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I3/96

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