深冷处理对H13钢组织结构和热稳定性的影响

doi:10.13228/j.boyuan.issn0449-749x.20190164

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Abstract In order to study the effect of deep cryogenic treatment on the thermal stability and microstructure evolution of H13 hot work mold steel,the thermal stability and microstructure evolution of H13 hot work mold steel treated by different heat treatment processes were characterized by Rockwell hardness tester,X-ray diffractometer,scanning electron microscope and transmission electron microscope. The results show that the deep cryogenic treatment promotes the transformation of the retained austenite to martensite,which resulted in the hardness of the tested steel subjected to deep cryogenic treatment is higher than that of the quenched tested steel. In addition,after deep cryogenic treatment,the hardness of the tested steel during tempering at 540 ℃ for 20 h is higher than that of the conventional heat treatment tested steel,and the cryogenically treated tested steel has better thermal stability too. Compared with the conventional heat-treatment tested steel,the deep cryogenic treatment promotes the segregation of carbon atoms in the steel and precipitates as carbides during the tempering process,thus the carbon content in the martensite matrix after tempering of the cryogenically treated tested steel is less than the conventional heat treatment. Moreover,the results of transmission electron microscopy showed that a large number of dispersed nano-scale M₂₃C₆ carbides precipitated during the tempering process of the tested steel. After a long time of tempering,the carbide coarsening caused the hardness of the tested steel to decrease with the increase of tempering time.

Key words： H13 steel deep cryogenic treatment hardness retained austenite carbide

Received: 15 April 2019

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	Articles by authors
	LI Dong-hui
	XIAO Mao-guo
	SUN Hao
	HE Wen-chao
	ZHANG Xu
	LI Shao-hong

Cite this article:

LI Dong-hui,XIAO Mao-guo,SUN Hao等. Effects of deep cryogenic treatment on microstructure and thermal stability of H13 steel[J]. Iron and Steel, 2020, 55(2): 95-102.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190164 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I2/95

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