Microstructure and properties of H13 steel treated by laser hardening and nitriding
H13 steel surface was modified by laser quenching/plasma nitriding compound treatment meth-od,so as to improve the performance of its surface.The influence process and mechanism of plasma nitri-ding,laser quenching,and the laser quenching/plasma nitriding compound treatment on the microstruc-ture,mechanical properties,and friction and wear properties of H13 steel were studied by X-ray diffrac-tion,optical observation,scanning electron observation,energy spectrum analysis technology,microhard-ness 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 treatment modified 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 signifi-cantly increased,and the average coefficient of friction is significantly reduced.
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