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运用扫描电镜观察Cr5钢在不同淬火温度下的显微组织,通过洛氏硬度计和摩擦磨损试验机分析淬火温度对Cr5钢摩擦磨损性能的影响。结果表明:Cr5钢淬火后的基体组织是马氏体,基体上会分布有未溶碳化物。随着淬火温度提升,未溶碳化物逐渐减少,淬火组织逐渐均匀化,但淬火温度达到一定值(1 050~990℃)时,碳化物基本溶解完全,组织较均匀,硬度值最大,为54.7HRC,磨损失重量最小,磨损表面相对较平整,耐磨性相对较好;继续升高淬火温度,马氏体组织粗大化,使得硬度有所降低,耐磨性下降。
The microstructure of Cr5 steel under different quenching temperatures was observed by scanning electron microscopy. The influence of quenching temperature on the friction and wear properties of Cr5 steel was analyzed by Rockwell hardness tester and friction and wear tester. The results show that the matrix structure of Cr5 steel after quenching is martensite, and undissolved carbides are distributed on the matrix. With the increase of quenching temperature, the amount of undissolved carbides gradually decreased and the microstructure of quenching gradually became homogeneous. However, when the quenching temperature reached a certain value (1 050 ~ 990 ℃), the carbides basically dissolved completely and the microstructure was uniform with the maximum hardness of 54.7 HRC, wear the least weight loss, the wear surface is relatively flat, wear resistance is relatively good; continue to raise the quenching temperature, martensite coarse, making the hardness decreased, wear resistance decreased.