0Cr15Ni5Cu2Ti钢表面2种气体氮化层的性能研究

Performance Research of Two Kinds of Gas Nitriding Coatings on the Surface of 0Cr15Ni5Cu2Ti Steel

为提高0Cr15Ni5Cu2Ti的耐磨、抗高温氧化等性能,采用气体氮化技术对0Cr15Ni5Cu2Ti钢表面进行渗氮处理;利用能谱仪(EDS)分析渗氮层的组成及含量;采用X射线衍射仪(XRD)分析渗氮层的物相成分;采用显微硬度计测试渗氮层的硬度;采用光学显微镜观察试样的磨损形貌;采用高温摩擦磨损试验机对渗氮层进行摩擦磨损试验;利用高温氧化炉对渗氮层进行抗高温氧化试验。结果表明:井式气体渗氮层主要由Fe、γ-Fe及CrN、α′N组成,而真空气体渗氮层主要由Fe、γ-Fe及CrN物相组成。基材经气体氮化后,氧化速率下降,抗高温氧化性能提高。井式气体氮化后试样的平均硬度值为369.9 HV_(2N),真空气体氮化后试样的平均硬度值为333.5 HV_(2N),而基材的平均硬度值为442.2 HV_(2N)。经气体氮化后试样磨损量减少,井式气体氮化试样磨损量为基材的25%,而真空气体氮化的磨损量为基材的40%。

In order to improve the wear resistance and high temperature oxidation resistance of 0Cr15Ni5Cu2Ti,the gas nitriding technology was used to nitridize the surface of 0Cr15Ni5Cu2Ti steel.The composition and content of nitriding layer were analyzed by energy dispersive spectrometer(EDS);The phase composition of the nitriding layer was analyzed by X-ray diffractometer(XRD);The hardness of nitriding layer was measured by microhardness tester;The worn morphology of nitriding layer was observed by optical microscope;The high-temperature friction and wear testing machine was used to test the friction and wear performance nitriding layer;A high-temperature oxidation furnace was used to perform high-temperature oxidation resistance experiments on the nitrided layer.Results showed that the well gas nitriding layer was mainly composed of Fe,γ-Fe,CrN andα′N,while the vacuum gas nitriding layer was composed of Fe,γ-Fe and CrN phase.After the substrate was nitridated by gas,the oxidation rate decreased and the high-temperature oxidation resistance was improved.The average hardness of the sample after gas nitrification was 369.9 HV_(2N),that after vacuum gas nitrification was 333.5 HV_(2N),and that of the substrate was 442.2 HV_(2N).After gas nitriding,the wear amount of the sample was reduced.The wear amount of the well gas nitriding sample was 25%of the substrate,while the wear amount of vacuum gas nitriding sample was 40%of the substate.