Microstructure and properties of H13 steel treated by laser hardening and nitriding

Abstract

Abstract: H13 steel surface was modified by laser quenching/plasma nitriding compound treatment method, so as to improve the performance of its surface. The influence process and mechanism of plasma nitriding, laser quenching, and the laser quenching/plasma nitriding compound treatment on the microstructure, mechanical properties, and friction and wear properties of H13 steel were studied by X-ray diffraction, optical observation, scanning electron observation, energy spectrum analysis technology, microhardness and nano testing, and high-frequency reciprocating wear test, respectively.The results showed:that the compound treatment process can significantly improve the comprehensive performance of the modified layer. Compared with single nitriding treatment, the hardness of effective case depth of the compound treatmentmodified layer increased from 1 180 HV and 80 μm to 1 360 HV and 550 μm, respectively. and the friction coefficient and wear rate decreased from 0.68 and 5.78×10^－8 mm³·N^－1·m^－1 to 0.59 and 1.35×10^－8 mm³·N^－1·m^－1, respectively. The hardness and wear resistance of the specimen are significantly increased, and the average coefficient of friction is significantly reduced.

Key words: H13 steel, laser quenching, plasma nitriding, compound treatment

CLC Number:

TG156.8

CAO Chi, LUO Wei-dong, CHEN Zhi-lin, LUO Li-ping, CHEN Xian-wu. Microstructure and properties of H13 steel treated by laser hardening and nitriding[J]. Journal of Lanzhou University of Technology, 2024, 50(1): 10-18.

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