CuNiSiTi合金的精密铸造及热处理

用熔模精密铸造法制备了CuNiSiTi焊钳活动轴;并基于此对合金进行了热处理强化工艺研究.用硬度计、涡流电导率测试仪和万能试验机测试合金性能,用光学金相显微镜(0M)观察合金的组织,探讨了铸态下合金的强化机理.结果表明,合理设计浇注系统可获得铸造质量合格的焊钳活动轴.铸造CuNiSiTi合金经920℃× 1.5 h固溶处理(水冷)+480℃×3 h时效处理(炉冷),合金的硬度HB达210、电导率达13.9 MS/m、抗拉强度达590 MPa、屈服强度达485 MPa、伸长率达11%.

Investment Casting CuNiSiTi Alloy and Its Heat Treatment

CuNiSiTi electrode holder mobile bar was produced by investment casting, and effects of heat treatment on the mobile bar were investigated. The mechanical properties and microstructure of the alloy were examined and observed by the sclerometer, eddy electrical conductivity tester and universal material testing machine as well as OM (optical microscope), meanwhile, strengthening mechanism of the alloy was described. The production verifies that electrode hold-er mobile bar with qualified quality can be successfully produced by designing proper gating system. The hardness, electrical conductivity, tensile strength, yield strength and elongation of the alloy reach 210HB, 13. 92MS/m, 590MPa, 485MPa and 11%, respectively, after solution at 920℃ for 1. 5 hours ( water cooling) and at 480℃ for 3 hours (furnace cool-ing), meeting the property requirements of electrode holder mobile bar.