新型轴承钢的始锻和终锻温度优化

Optimization on initial and final forging temperature for new type bearing steel

为优化锻造工艺以提高新型含锶轴承钢的性能和使用寿命,采用不同的始锻温度和终锻温度进行了新型含锶轴承钢的锻造成形,并进行了耐磨损性能和热疲劳性能的测试与分析。试验结果表明：随始锻温度从1120℃增加至1240℃、终锻温度从900℃增加至975℃,新型含锶轴承钢的耐磨损性能和热疲劳性能呈现先增强后弱化的变化趋势。适当增加锻造温度可提高轴承钢试样的耐磨损性能,磨痕的宽度和深度均变浅,磨损量变小,还能阻碍裂纹的萌生和发展。从提高新型含锶轴承钢试样的耐磨损性能和热疲劳性能出发,其锻压工艺优选始锻温度为1180℃、终锻温度为950℃。

In order to improve the performance and service life of bearing steel containing Sr,a new type bearing steel containing Sr was forged under different initial and final forging temperatures,and the testing and analyses of wear resistance and thermal fatigue properties were carried out. The experimental results show that with the increasing of initial forging temperature from 1120 ℃ to 1240 ℃,the final forging temperature increases from 900 ℃ to 975 ℃,and the wear resistance property and thermal fatigue property of the new type bearing steel containing Sr show the tendency of strengthening first and then weakening. Therefore,the suitable increase of the forging temperature can improve the wear resistance property of bearing steel specimens,and the width and depth of the abrasion become shallow. Thus,the wear quantity devreases,and the initiation and propagation of the crack can be hindered. From the view point of improving the wear resistance and thermal fatigue properties of new type bearing steel containing Sr,the initial forging temperature of 1180 ℃ and the final forging temperature of 950 ℃ are the most preferred forging process.