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采用等离子弧对HT200铸铁进行了熔凝处理,利用光学显微镜、显微硬度仪对熔凝试样各区域进行测试分析,在综合考虑材料非线性、熔化潜热、热源模型对等离子弧熔凝温度场影响的基础上,采用ANSYS软件建立了HT200铸铁等离子弧熔凝连续移动三维瞬态温度场有限元模型。结果表明,熔凝层显微硬度达到750～850 HV 0.1,熔凝层组织为马氏体+渗碳体+残留奥氏体;模拟熔池最高温度达到2366℃,熔凝区模拟的形状及尺寸与实际基本吻合。
HT200 cast iron was melted by plasma arc. The microstructure of the HT200 cast iron was analyzed by optical microscope and microhardness tester. Based on the analysis of material non-linearity, latent heat of fusion and heat source model, The finite element model of three-dimensional transient temperature field of HT200 cast iron plasma arc melting continuous movement was established by ANSYS software. The results show that the microhardness of the fused layer reaches 750-850 HV 0.1, and the microstructure of the fused layer is martensite + cementite + retained austenite. The maximum temperature of the simulated molten pool reaches 2366 ℃, the simulated shape of the melting zone and The size and the actual basic match.