采用脉冲爆炸-等离子体(PDP)技术对T8钢进行表面改性处理,电容分别为600,800,1000μF.采用SEM,XRD分析了PDP处理前后T8钢的表层组织和相结构的变化,利用显微维氏硬度计和摩擦磨损试验机研究了PDP处理前后T8钢的显微硬度和耐磨损性能的变化.结果表明:随着电容的增加,T8钢表面先发生光滑化,然后出现大量火山状熔坑,熔坑的出现是由PDP的能量和材料本身的不均匀性造成的.PDP处理使T8钢表面发生由马氏体α'-Fe向奥氏体γ-Fe的转变,并发生渗氮现象形成Fe3N.T8钢改性层厚度随着电容的增加而增加,当电容为1000μF时,改性层平均厚度为68.27μm,其组织由柱状组织和细化组织组成.随着电容的减小,柱状组织厚度也减小.PDP处理后T8钢改性层显微硬度提高约2倍,耐磨损性能也明显改善,最高为基体的2.6倍.
T8 steel was carried out surface modification treatment by pulse detonation-plasma(PDP) technology with the capacity of 600,800,1000μF respectively.The microstructure and phase structure of T8 steel before and after PDP treatment were analyzed by using XRD and SEM.The microhardness and wear resistance before and after treatment were investigated by microhardness tester and wear tester.The results show that the surface smoothing occur first,and then the craters are formed.The craters are caused by the inhomogeneity of PDT energy and the material itself.PDP treatment makes the surface layer of T8 steel changed from martensite α'-Fe to austenite γ-Fe,and the Fe3N is formed due to nitriding phenomenon.The thickness of modified layer is increased with the increasing of the capacity.When the capacity is 1000μF,the average thickness of modified layer is 68.27μm and it composes of columnar and fine grain structure.The thickness of columnar structure is decreased with the decreasing of the capacity.The microhardness is improved by a factor of about 2,and the wear resistance is also obviously increased.The maximum wear resistance is 2.6 times of the matrix.
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