Study on the property of laser remelting high-carbon-high-alloy steel
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摘要: 采用CO2连续波工业激光器在高碳高合金钢Cr12表面进行了激光熔凝处理试验,比较了激光处理前后Cr12钢的抗弯强度和耐磨性,采用电子显微镜观察了断口特征、断口处和磨面处熔凝层的TEM形貌,并用X射线仪测量了抗弯试验前后激光处理层中奥氏体含量随熔凝层深的变化。结果表明,激光熔凝处理后获得超细化的枝晶组织,其抗弯强度和耐磨性显著提高。在抗弯试验和磨损过程中,熔凝层内的奥氏体含量大幅度降低,并出现了大量的层错和位错团。晶粒细化,奥氏体应变诱发马氏体转变,大量位错团的产生是抗弯强度和耐磨性提高的主要原因。Abstract: Laser remelting on the surface of Cr12 steel was performed with CO2 laser.The bending strength and wear resistance of Cr12 before and after laser surface remelting were compared.Fractorgraphy and TEM of microstructure in the remelting layer were studied by electron microscope.Austenitic distribution of the laser remelting layer as a function of distance from surface was measured with X-ray diffractometer.The experimental results show that super-refined microstructure is formed in the remelting layer.The bending strength and wear resistance are enhanced evidently.Plenty of dislocation cluster are found in the TEM of microstructure in the remelting layer after the bending strength and wear test.Super-refined microstructure,strain-induced martensite transformation in the retained austenite and formation of dislocation cluster are the important reasons to reinforce the bending strength and wear resistance.
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