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利用脉冲等离子爆炸工艺对H13钢进行表面改性处理,通过OM、SEM和EDS分析了材料改性后的显微组织、断口形貌和元素分布,采用努氏硬度计测试了截面的显微硬度分布,并对其改性机制和工艺参数影响进行了分析和讨论。结果表明,脉冲等离子爆炸工艺可在H13钢表面形成厚度均匀,组织致密,高硬度的改性层;改性层由柱状晶区和细晶区组成,表层产生了离子注入现象,硬度呈现先上升后下降的趋势。脉冲等离子爆炸工艺能量越高,改性层越厚,晶粒尺寸越细,硬度越高。
The surface modification of H13 steel was carried out by pulsed plasma explosion process. The microstructure, fracture morphology and elemental distribution were analyzed by OM, SEM and EDS. The microhardness Distribution, and its modification mechanism and process parameters were analyzed and discussed. The results show that the pulsed plasma explosion process can form a modified layer with uniform thickness, compact structure and high hardness on the surface of H13 steel. The modified layer is composed of columnar and fine grain regions with ion implantation on the surface, After falling trend. Pulsed plasma explosion process, the higher the energy, the thicker the modified layer, the smaller the grain size, the higher the hardness.