Transactions of Materials and Heat Treatment

Title：Influence of deep cryogenic treatment on wear properties for 4Cr5MoSiV1 hot work die steel

Authors： Rao Chuchu Zhang Xinxing

Unit： Quzhou College of Technology Zhejiang University of Technology

KeyWords： deep cryogenic treatment 4Cr5MoSiV1 hot work die steel carbide hardness wear resistance property

ClassificationCode：TG156.91

year,vol(issue):pagenumber：2022,47(8):235-240

Abstract：

In order to study the influence of deep cryogenic treatment on the wear properties of 4Cr5MoSiV1 hot work die steel, the microstructure analysis, hardness test and wear property test of 4Cr5MoSiV1 steel treated with different deep cryogenic times were carried out. The results show that the cryogenic treatment can significantly improve the hardness and wear resistance property of 4Cr5MoSiV1 hot work die steel. After 1030 ℃×40 min quenching + （-196 ℃）×24 h deep cryogenic treatment + 500 ℃×2 h secondary tempering treatment, the wear rates at 25 and 600 ℃ are 1.4×10-5 and 2.7×10-5 g·m-1, respectively, which is reduced by 30.0% and 34.1% respectively compared with the conventional heat treatment, and its hardness reaches 55.2 HRC, which is increased by 14.8% compared with the conventional heat treatment. Thus, the deep cryogenic treatment can transform the residual austenite into martensite in the structure of 4Cr5MoSiV1 hot work die steel, and promote the precipitation of the fine and dispersible carbides, and thereby improve its wear resistance property.

Funds：

浙江省基础公益研究计划项目（LGC22E050006）；衢州市科技攻关项目（2021K30）

作者简介：饶楚楚(1987-)，女，硕士，副教授，工程师，E-mail：raochuchu@163.com

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