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采用摩擦磨损实验的方法,研究了工作温度对于三种冷作模具钢耐磨性的影响.结果表明:在不同的工作温度下,三种冷作模具钢的对磨表面均存在磨粒磨损,当工作温度达到195℃及以上时,对磨表面的主要磨损机制由磨粒磨损转为氧化磨损,并伴随着粘着磨损和疲劳磨损.随着工作温度的升高,9CrSi中的M7C3共晶碳化物的含量先上升后下降,其磨损量与M7C3的含量呈正相关关系;ASSAB88中的M7C3共晶碳化物含量则持续降低,且磨损量与M7C3的含量呈正相关关系并趋于平缓.而随着工作温度的升高,012Al中虽没有M7C3但总碳化物的含量逐渐减少,磨损量与总体碳化物含量呈正相关关系.
The effects of working temperature on the wear resistance of three kinds of cold work die steels were studied by means of friction and wear test.The results show that there are abrasive wear on the surfaces of the three kinds of cold work die steels at different operating temperatures, When the operating temperature reaches 195 ℃ and above, the wear mechanism of the wear surface is changed from abrasive wear to oxidative wear, along with the adhesive wear and fatigue wear.With the increase of operating temperature, the M7C3 eutectic carbonization in 9CrSi The content of M7C3 in ASSAB88 was continuously decreased, and the content of M7C3 in ASSAB88 was positively correlated with the content of M7C3. However, the total carbides content in 012Al did not decrease with the increase of working temperature. The amount of wear was positively correlated with the total carbide content.