粉末锻造Fe-Ni-Cu-C-Mo齿轮材料热处理及性能研究

The heat treatments of the powder forged Fe-Ni-Cu-C-Mo materials after forging were studied. The continuous cooling transformation diagram of the powder forged Fe-Ni-Cu-C-Mo alloys was constructed to guide the selection of cooling process after forging. The quenching Fe-Ni-Cu-C-Mo specimens were tempered at various temperatures in the low temperature tempering test, and the effects of tempering temperatures on the microstructure and mechanical properties of the Fe-Ni-Cu-C-Mo materials were investigated. The results show that, when the cooling rate of the Fe-Ni-Cu-C-Mo specimens after forging is more than 7.0℃•s^-1, the microstructure is the martensite and the hardness tends to be stable. Tempering at 150 and 175℃, the carbide is evenly distributed inside the martensite lath, which acts as the precipitation strengthening, and the Fe-Ni-Cu-C-Mo specimens exhibit the excellent tensile properties.