激光与光电子学进展, 2019, 56 (5): 051402, 网络出版: 2019-07-31   

激光熔覆304不锈钢稀释效应的数值模拟与实验 下载: 1157次

Numerical Simulation and Experiment of Dilution Effect in Laser Cladding 304 Stainless Steel
作者单位
西安科技大学机械工程学院, 陕西 西安 710054
摘要
为了研究激光熔覆过程中的稀释效应,模拟了不同扫描速度下单道激光熔覆304不锈钢过程中的温度场,并依据材料的熔点计算出稀释率。在27SiMn钢表面上进行了激光熔覆实验,测量了单道熔覆层横截面的高度和宽度以及热影响区的深度,并计算出稀释率。分析了熔覆层中不同区域的元素组成,测量了显微硬度。结果表明,数值模拟和实验得到的稀释率变化趋势基本一致,均随着扫描速度的增大而逐渐减小;扫描速度越大,熔覆层中元素的稀释效应越小,熔覆层中越靠近基体的区域,元素的稀释现象越明显;熔覆层到基体的显微硬度呈低-高-低的三台阶式分布,且随着扫描速度的增大,高硬度区的宽度逐渐变小。
Abstract
In order to study the dilution effect in the process of laser cladding, the temperature fields in the process of single laser cladding of 304 stainless steel under different scanning speeds are simulated. Based on the melting point of materials, the values of dilution ratio (DR) are calculated. The laser cladding experiment is conducted on the surface of 27SiMn steel. The height and width of the cladding layer and the depth of the heat affected zone are measured, and the value of DR is calculated. The element compositions of the cladding layer in different areas are analyzed. The microhardness is measured. The results show that the variation trends of DR obtained by numerical simulation and experiment are basically consistent, and DR decreases gradually with the increase of scanning speed. The higher the scanning speed, the smaller the dilution effect of elements in the cladding layer is. The nearer the spot to the substrate, the more obvious the dilution effect of element composition in the cladding layer is. The microhardness from cladding layer to substrate shows the three-stage distribution of low-high-low. The width of the high hardness zone decreases gradually with the increase of scanning speed.

郭卫, 李凯凯, 柴蓉霞, 张丽苹. 激光熔覆304不锈钢稀释效应的数值模拟与实验[J]. 激光与光电子学进展, 2019, 56(5): 051402. Wei Guo, Kaikai Li, Rongxia Chai, Liping Zhang. Numerical Simulation and Experiment of Dilution Effect in Laser Cladding 304 Stainless Steel[J]. Laser & Optoelectronics Progress, 2019, 56(5): 051402.

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