激光加工参数与熔覆层特征和性能的关系

Relationship between characteristic and property of cladding and laser processing parameters

在HT150基体上进行宽带送粉激光熔覆,研究不同扫描速度和送粉速率条件下熔覆层的显微组织与性能,并对产生熔覆层组织不均匀性的原因进行了探讨。实验结果表明:随着扫描速度和送粉速率的增大,熔覆层组织趋于细化,耐磨性有所提高,在送粉速率较小时,扫描速度作用较显著;其他参数不变的前提下,随扫描速度增大,熔覆层显微硬度增大,界面硬度梯度变陡。

Several claddings were obtained on gray iron substrate.The microstructure and property of the cladding at various scanning speed and power feeding rate was measured.The reason of partial microstructure heterogeneity of the cladding is discussed using solidification theory.The results show that the microstructure of the cladding tends to fine and the wear resistance of the specimens increases along with the increasing of the scanning speed and the power feeding rate.The effect of the scanning is obviously under lower power feeding rate.The micro-hardness of coating increase and the hardness grads become steep with the increasing of the scanning speed.