Microstructure and properties of new-type Cr8 cold working die steel used in passenger cars after vacuum gas quenching

doi:10.13251/j.issn.0254-6051.2022.05.014

Abstract

Abstract: Comparative analysis was carried out on microstructure and mechanical properties of the two kind of Cr8 cold working die steel of domestic HNC53 and Japanese KD11max by means of hardness tester, metallographic microscope and SEM. The influence of carbide evolution on mechanical properties of the tested steels before and after heat treatment was analyzed. The results show that the content of P and S in HNC53 steel is within standard range. Compared with the KD11max steel, the massive eutectic carbide particles in the original microstructure of the HNC53 steel become smaller and more evenly distributed in the matrix. When vacuum gas quenched at 1030 ℃ and tempered at 520 ℃, the microstructure of the two steels is composed of martensite, large eutectic carbides and fine secondary precipitated carbides, compared with before heat treatment, the size and quantity of massive eutectic carbides are smaller and fewer. After tempering at 520 ℃, there are more precipitated secondary carbide particles in the HNC53 steel evenly distributed on the martensite matrix. Compared with KD11max steel, HNC53 steel has little difference in hardness and toughness.

Key words: Cr8 cold working die steel, carbides, hardness, secondary carbides

CLC Number:

TG142

Yuan Sha, Zhou Leyu, Jiang Peng, Zhang Jianbo, Chen Hao. Microstructure and properties of new-type Cr8 cold working die steel used in passenger cars after vacuum gas quenching[J]. Heat Treatment of Metals, 2022, 47(5): 87-91.

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