延长汽车齿轮热锻模使用寿命的热处理工艺研究  

Study on Heat Treatment Process of Hot Forging Die for Automobile Gear to Prolong Service Life

作　　者：刘健[1] 

机构地区：[1]浙江工业职业技术学院,浙江绍兴312000

出　　处：《热加工工艺》2014年第12期184-186,190,共4页Hot Working Technology

基　　金：浙江省科技计划项目(2012C31018);绍兴市科技计划项目(2012B70026)

摘　　要：对O12Al汽车齿轮热锻模进行了不同工艺的热处理,并进行了显微组织、高温硬度、高温耐磨损性能、抗高温氧化性能和抗热疲劳性能的测试与分析。结果表明,采用分级淬火和二次回火的热处理工艺,有利于提高O12Al汽车齿轮热锻模的高温硬度、高温耐磨损性能、抗高温氧化性能和抗热疲劳性能,延长模具的使用寿命,其高温硬度提高4.72%,高温磨损体积减小75.95%,(500±5)℃×10 h的单位面积质量增加减少77.55%,(500±5)℃^(20±5)℃的1000次循环后的热疲劳级别从14级变为4级。O 12Al hot forging die for automobile gear was heat treated by different process. And the microstructure, surface hardness, wear resistance, oxidation resistance and thermal fatigue resistance at high temperature were tested and analyzed. The results show that grading quenching and double tempering can improve the surface hardness, wear resistance, oxidation resistance and thermal fatigue resistance at high temperature, and prolong the service life ofO 12A1 hot forging die for automobile gear. Moreover, the above-mentioned heat treatment process can make surface hardness at high temperature increase by 4.72%, wear volume decrease by 75.95%, mass increment per unit area decrease by 77.55% for （500±5）℃×10h, and make thermal fatigue grade change from 14 to 4 for 1000 cycle times when the temperature changes from （500±5）℃～（20±5）℃.

关 键 词：汽车齿轮热锻模 使用寿命 热处理工艺 分级淬火 二次回火 

分 类 号：TG156.3[金属学及工艺—热处理]