由于光纤激光的良好光束质量,光纤激光器在金属材料表面强化方面的应用日益引起学者的重视.使用YLS-3000W光纤激光器对Cr12MoV冷作模具钢进行激光表面淬火处理的工艺试验,研究了不同工艺参数对硬化层深度和显微硬度的影响及硬化层显微组织特征.结果表明,Cr12MoV表面经光纤激光表面淬火后得到淬火层、过渡层和基体3层不同的组织.淬火层的晶粒细小,由隐晶马氏体、弥散分布的碳化物组成.过渡层由马氏体及弥散分布的碳化物和残留奥氏体组成.在扫描速度和离焦量一定的条件下,相变硬化层深度随光纤激光功率的增大而增加.在最佳工艺(光纤激光功率900 W,扫描速度0.3 m/s,离焦量-4 mm)条件下,硬化层平均硬度达609HV.分析认为光纤激光淬火造成的组织细化和过饱和的隐晶马氏体的形成是硬度提高的主要原因.
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