H13钢中富钒初生碳化物的形成及影响因素

doi:10.13228/j.boyuan.issn0449-749x.20170483

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Abstract Primary carbides have an important influence on toughness of H13 steel. Optical microscope，SEM-EDS and EMPA were used to analyze composition，indicating that the carbides was rich of vanadium，as well as size distribution and morphology of carbides. Segregation model and thermodynamics are applied to investigate the formation of different [VCx]carbides. And show the effects of carbides activity variation on formation stage during solidification. It is found that primary carbides can not be formed above liquidus，and vanadium and carbon aggregation mainly influences the carbides precipitation in interdendritic area. VC0.88 carbides can be formed in the mushy zone firstly and easily，then eutectic reaction may be occured for V2C precipitation. Solute segregation has an effect on primary carbides size besides critical precipitation solid fraction and dendritic size. The carbides can be controlled by adjusting initial vanadium and carbon content in steel together with cooling condition during solidification. The precipitation of primary carbides can be inhibited when[w([V]0)≤0.6%、][w([C]0)≤0.37%]in H13 steel，which is important for developing medium alloyed hot work die steel without primary carbides.

Received: 25 September 2017 Published: 11 May 2018

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TF741.3

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	Articles by authors
	XUN Xiao-Lin
	YU Fei
	MAO Meng-Shou
	CHEN Xi-Chun
	DU An-Wei
	GUO Han-Jie

Cite this article:

XUN Xiao-Lin,YU Fei,MAO Meng-Shou等. Formation and affecting factors of V-rich primary carbides in H13 steel[J]. Iron and Steel, 2018, 53(5): 68-75.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20170483 OR http://www.chinamet.cn/Jweb_gt/EN/Y2018/V53/I5/68

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