Cr含量降低对H13钢组织与力学性能的影响

doi:10.11896/j.issn.1005-023X.2018.08.022

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Abstract Properties of traditional H13 steel with 5% Cr and modified H13 steel with 3% Cr were compared, relevant microstructures and phase composition were also investigated using scanning electron microscopy, transmission electron microscopy and X-ray diffraction, and the effect of Cr on the microstructures and properties of H13 steel were studied. The results demonstrated that the tempering resistance and high temperature strength of H13 steel were remarkably enhanced by reducing the Cr content, mainly related to the level of recovery of martensite and the types of precipitates during tempering. When the traditional H13 steel was tempered at 650 ℃, the martensite was almost completely recovered and a large amount of near spherical Cr₇C₃ and M₆C type carbides with a size of about 120 nm were precipitated along the original martensite lath boundaries and grain boundaries, reducing the second phase reinforcement effect. But for the modified H13 steel with 3% Cr, the lath martensite with high dislocation density was still observed after 650 ℃ tempering, and intensive plate-like VC type carbides with a length of about 25 nm and thickness about 2.5 nm were found within the martensite lath. The dispersed VC carbide precipitated during tempering significantly inhibited the recovery of martensite, thus enhancing the high temperature properties.

Key words： H13 tool steel chromium content microstructure mechanical property

Published: 11 May 2018

CLC number:

TG142.1

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	Articles by authors
	ZHANG Jinxiang
	OUYANG Xi
	ZHOU Jian
	ZHANG Jishan

Cite this article:

ZHANG Jinxiang,OUYANG Xi,ZHOU Jian, et al. Study on Microstructure and Mechanical Properties of H13 Tool Steel After Chromium Content Reduction[J]. Materials Reports, 2018, 32(8): 1323-1327.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.08.022 OR http://www.mater-rep.com/EN/Y2018/V32/I8/1323

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