摘要
通过激光淬火/离子渗氮复合方法对H13钢进行表面改性处理,从而提高其表面的性能.利用X射线衍射技术、光学显微观察、扫描电子显微观察、能谱分析技术、显微硬度和纳米测试系统以及高频往复磨损试验,分别研究了离子渗氮、激光淬火、以及激光淬火与离子渗氮复合处理对H13钢改性层组织结构、力学性能、摩擦磨损性能的影响过程和影响机理.结果表明:复合处理工艺可以显著改善改性层的综合性能.和单一渗氮处理相比,复合处理改性层硬度和有效硬化层深度分别从1 180 HV和80μm提高至1 360 HV和550μm,摩擦系数和磨损率分别从0.68和5.78×10-8 mm3·N-1·m-1降低至0.59和1.35×10-8 mm3·N-1·m-1.试样的硬度和耐磨性显著增加,平均摩擦系数明显降低.
Abstract
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.
维普
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