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以精锻M42喷射成形高速钢为原料,通过热处理正交试验,优化了材料热处理工艺,并分析了不同热处理制度下材料显微组织、硬度、抗弯强度及碳化物的演变规律。结果显示,最佳热处理工艺为:淬火保温温度1180℃,回火温度540℃,回火3次,每次1 h。该工艺下,M42洛氏硬度达到67.2 HRC,抗弯强度达到3115 MPa。淬火保温温度通过控制M_6C型碳化物的溶解量,影响最终碳化物的尺寸。淬火温度为1190℃时,M_6C型碳化物充分溶解,回火过程碳化物均匀弥散析出。
Using precision forging M42 high speed injection molding as raw material, the heat treatment orthogonal experiment was used to optimize the material heat treatment process, and the microstructure, hardness, flexural strength and carbide evolution under different heat treatment conditions were analyzed. The results show that the best heat treatment process is: quenching holding temperature 1180 ℃, tempering temperature 540 ℃, tempering three times, each time 1 h. Under this process, the Rockwell hardness of M42 reaches 67.2 HRC and the flexural strength reaches 3115 MPa. Quenching temperature by controlling the dissolution of M_6C type carbide, the final carbide size. Quenching temperature of 1190 ℃, M_6C type carbide fully dissolved, carbide precipitation during tempering uniform dispersion.