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通过光学显微镜、SEM、拉伸试验检测手段研究高能脉冲电流处理后GCr15钢的显微组织及力学性能的变化。结果表明,由于高能脉冲电流处理能提高奥氏体形核率以及控制长大的共同作用,原始奥氏体晶粒以及马氏体组织均得到细化,出现隐针马氏体。同时由于脉冲电流促进碳化物的析出,提高了碳化物的析出量。与传统热处理的GCr15钢相比,高能脉冲电流处理后具有更好的力学性能,抗拉强度和伸长率均得到提高,而且耐磨性也有一定改善。
The microstructure and mechanical properties of GCr15 steel after high-energy pulse current treatment were investigated by optical microscope, SEM and tensile test. The results show that the original austenite grain and martensite are refined and the hidden martensite appears due to the combination of high-energy pulse current treatment and austenite nucleation rate. At the same time as the pulse current to promote the precipitation of carbides, increased carbide precipitation. Compared with the conventional heat-treated GCr15 steel, the high-energy pulse current treatment has better mechanical properties, tensile strength and elongation are improved, and wear resistance is also improved.