机电传动部件Mg-Nd-Zn合金铸造工艺研究

Research on Casting Process of Mg-Nd-Zn Alloy Used for Electromechanical Transmission Components

以机电一体化设备的机械传动部件用Mg-Nd-Zn合金为研究对象,采用重力金属铸造(GPC)、重力砂型铸造(GSC)、低压金属型铸造(LPC)和低压砂型铸造(LSC)4种不同的铸造方式,研究了铸造工艺对合金显微组织、拉伸力学性能和疲劳行为的影响。结果表明,4种铸造工艺下的合金中,GSC合金的屈服强度最低,LPC合金的屈服强度最高;4种铸造工艺下合金疲劳强度的差异性不大;GPC和GSC两种工艺下疲劳强度的波动幅度较小,均为4 MPa,而LPC工艺下的波动幅度最大,LSC铸造工艺下的疲劳强度波动最小。

Taking the Mg-Nd-Zn alloy used for mechanical transmission parts of electromechanical integration equipment as research object, four different casting methods of gravity casting（GPC）, gravity sand casting（GSC）, low pressure casting（LPC） and low pressure casting（LSC） were adopted, the effect of casting process on microstructure, tensile mechanical properties and fatigue behavior were studied. The results show that GSC alloy has minimum yield strength, the yield strength of LPC alloys is the highest in four kinds of casting process. The differences of fatigue strength in four alloy casting process are small. The fatigue strength of GPC and GSC have little fluctuation, which is about 4 MPa. And the fluctuation amplitude of LPC process is biggest, LSC casting process is smallest.