摘要
通过分析激光熔覆过程中金属颗粒、基体与激光束之间的相互作用,建立单层单道涂层几何尺寸理论预测模型。基于316L不锈钢表面激光熔覆Ni60合金涂层的实验结果,采用多元回归分析拟合出修正系数与工艺参数的回归方程,在理论预测模型的基础上引入修正系数,获得单层单道涂层几何尺寸修正预测模型,并在激光功率、扫描速度和送粉速率分别为1 750 W、3.5 mm/s和0.099 g/s的条件下进行验证实验。结果表明:熔宽、熔高和熔深的修正预测值与实验值的平均相对误差分别为0.85%、2.47%和6.05%,修正预测模型的预测精度较理论预测模型明显提高。激光熔覆验证实验表明修正预测模型具有可行性。Ni60合金涂层富含硬质相,其硬度可达316L不锈钢基体的3.4倍,磨损率约为基体的50%,强化效果显著。
A theoretical prediction model for geometry dimensions of single-layer single-track coatings was established by analyzing the interactions between metal particles,substrate,and laser beam during the laser cladding process.Based on the experimental results of laser cladding Ni60 alloy coating on the surface of 316L stainless steel,the regression equations between the correction coefficients and the process parameters were achieved by multiple regression analysis.Therefore,the modified prediction model of geometric dimensions of single-layer single-track coatings was obtained by introducing the correction coefficients into the theoretical prediction model.The validation experiment was carried out under the conditions of the laser power,the scanning speed,and the powder feed rate of 1750 W,3.5 mm/s,and 0.099 g/s,respectively.The results show that the average relative errors between the modified prediction and experimental values of melt width,melt height,and melt depth are 0.85%,2.47%,and 6.05%,respectively.The prediction accuracy of the modified prediction model is significantly improved compared with that of the theoretical prediction model.The results of the validation experiments show the feasibility of the modified prediction model.The Ni60 alloy coating is rich in hard phases,and its microhardness can be up to 3.4 times of that of 316L stainless steel substrate,and its wear rate is about 50%of that of substrate.The strengthening effect is remarkable.
作者
刘丽兰
杨帆
李思聪
汪甡
王甲一
吴子英
LIU Lilan;YANG Fan;LI Sicong;WANG Shen;WANG Jiayi;WU Ziying(School of Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xi’an 710048,China)
出处
《粉末冶金材料科学与工程》
2024年第5期362-372,共11页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(42472381)。
作者简介
通信作者:刘丽兰,副教授,博士。电话:15353621358,E-mail:liulilans@163.com。
