淬火温度和回火工艺对4Cr5Mo2V钢高温耐磨性能的影响

Effect of Quenching Temperature and Tempering Process on High Temperature Wear Resistance of 4Cr5Mo2V Steel

将4Cr5Mo2V钢在1000~1090℃下淬火,并通过不同温度2次回火处理将相同淬火温度下试验钢的回火硬度分别调整至55,52 HRC,研究了淬火温度和回火工艺对显微组织、冲击韧性和高温(350℃)耐磨性能的影响。结果表明:回火硬度相同时,淬火温度过高或过低均会降低试验钢的韧性而加剧磨损表面材料剥落,从而降低耐磨性能;相同回火硬度下,1030℃淬火条件下试验钢的韧性和高温耐磨性能最好,1090℃淬火条件下最差;淬火温度相同时,较低温度回火试验钢因具有较高回火硬度,能够起到支撑表面氧化层的作用,其耐磨性能比较高温度回火时好;4Cr5Mo2V钢的推荐热处理工艺为1030℃×30 min油淬+560℃×2 h×2次回火。

The 4Cr5Mo2V steel was quenched at 1000-1090℃.The tempering hardness of the test steel quenched at the same temperature was adjusted to 55,52 HRC by tempering twice at different temperatures,and the effects of the quenching temperature and tempering process on the microstructure,impact toughness and high temperature(350℃)wear resistance were studied.The results show that when the tempering hardness was the same,too high or too low quenching temperatures would reduce the toughness of the test steel and aggravate the peeling of the wear surface material,thereby reduced the wear resistance.Under the same tempering hardness,the toughness and high temperature wear resistance of the test steel quenched at 1030℃were the best,and at 1090℃were the worst.When the quenching temperature was the same,the test steel tempered at relatively low temperatures had higher tempering hardness,which could support the surface oxide layer,so its wear resistance was better than that tempered at relatively high temperatures.The recommended heat treatment process for 4Cr5Mo2V steel was 1030℃×30 min oil quenching+560℃×2 h tempering for twice.