Oxidation Process Of Deep QPQ Artifacts Wearresisting Performance Impact

QPQ technology is a revolutionary new technology in metal surface areas. surfacemodification field is actually a kind of green environmental protection technology, which is saltbath carbon oxygen nitrogen altogether permeability. This is technology includes nitrogenprocess, polishing and oxidation process. QPQ technology has high wear resistance, highcorrosion, small deformation, fatigue resistance and energy saving features.This technologyhas been widely used in industrial machinery, agricultural machinery, petroleum machineryand other required wear-resisting, corrosion resistance, resistance to fatigue or easy todeformation. Because of the compound layer is too thin (15um or less), the application of thistechnology has been limited. In fact, increasing permeability layer thickness and improving thepermeability layer structure are the inevitable trend of current development.This paper adopted high temperature salt bath nitriding treated with different temperingtemperature, researched the changes of its organization and performance. According to thechanges of microhardness, chosen the surface microhardness increased more process as thewear test samples’ processing technology. Sliding wear, rolling wear and contact fatigue wearare used to know deeper QPQ permeability layer’s wear regularity and mechanism. Opticalmicroscope and XRD are used to observation and analysis of the compound layer’s phasecomposition and crystal structure.(1) According to the surface hardness datas know that high temperature nitriding with250℃oxidation4hours can better enhance the surface hardness of the sample.42CrMo’sprocessed surface hardness can reach HV878, compared with ordinary nitriding process’shardness increased by30％.45steel processed surface hardness can reach HV780, comparedwith ordinary nitriding process’s hardness increased by25％.(2) The sliding wear data of42CrMo shows that1#(645℃×1.5h+380℃×4h) process’swear rate is18.125mg/h,2#(645℃×1.5h+250℃×4h) process’s wear rate is15.625mg/hand3#(580℃×2h+380℃×0.5h) process’s wear rate is20.687mg/h,2#process is furtherimproving the wearability of materials by25％.(3) we tell from the1264hours rolling wear data, the three kinds of nitriding processes’13um compound layer are almost being rolled off.3#process has13um compound layer areall being rolled off;1#process and2#process both have33um compound layer, throughtrolling wear both have20um remained.Every kind process of lossing weight are similarly,it’s150mg. So we can tell from the data that three kind processes have the same kind roll wearperformance. (4) The fatigue life of1#process is134000shifts; the fatigue life of2#process is263000shifts; the fatigue life of3#is75000shifts.2#has the better contact fatigue resistanceperformence.