脉冲爆炸-等离子体技术处理对T8钢表层组织和性能的影响

发布时间：2018-08-16 17:00

【摘要】：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Fe_3N。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。
[Abstract]:The surface modification of T8 steel was carried out by pulsed explosion and plasma (PDP) technique. The capacitance of T8 steel was 600 渭 F 800 渭 F, respectively. The changes of surface structure and phase structure of T8 steel before and after PDP treatment were analyzed by means of PDP. The changes of microhardness and wear resistance of T8 steel before and after PDP treatment were studied by using Vickers microhardness tester and friction and wear tester. The results show that with the increase of capacitance, the surface of T8 steel is smoothed first, and then a large number of volcanic melting pits appear. The appearance of melting pit is caused by the energy of PDP and the inhomogeneity of material itself. PDP treatment causes the transformation from martensite 伪 -Fe to austenite 纬 -Fe on the surface of T8 steel, and the nitriding phenomenon forms the thickness of modified layer of Fe_3N.T8 steel increases with the increase of capacitance. When the capacitance is 1000 渭 F, the average thickness of the modified layer is 68.27 渭 m, and the microstructure is composed of columnar structure and fine microstructure. With the decrease of capacitance, the microhardness and wear resistance of the modified layer of T8 steel were increased by about 2 times, and the wear resistance of the modified layer was improved by 2.6 times as much as that of the matrix.
【作者单位】：江西省科学院应用物理研究所;中国兵器工业标准化研究所;
【基金】：江西省科技计划项目(20151BBB50264,20151BDH80002) 江西省重点研发计划项目(20161BBH80061) 江西省自然科学基金(20161BAB216147) 江西省对外科技合作计划(2015BDH80002)
【分类号】：TG174.4

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