Transactions of Materials and Heat Treatment

Title：Simulation study on temperature field for WC 12Co composite material by selective laser melting

Authors：

Unit：

KeyWords：

ClassificationCode：TH142；TG146

year,vol(issue):pagenumber：2023,48(9):130-141

Abstract：

To improve the forming quality of WC 12Co hard composites material by selective laser melting (SLM), the numerical simulation study of the temperature field in the forming process of WC 12Co hard composites material by SLM was conducted by finite element simulation software Ansys 2021R1, and the temperature distribution in the forming temperature field and the influences of forming process parameters (laser power, scanning speed, scanning spacing and substrate preheating temperature) on the temperature field were studied, which provided experimental basis for optimizing the forming of WC 12Co hard composite material. The results show that with the increasing of laser power, the temperature of forming area increases, and the peak temperature of position point 3 increases from 3507.47 ℃ to 3837.52 ℃. With the increasing of laser scanning speed, the temperature of forming area decreases, the peak temperature of position point 5 decreases from 3592 ℃ to 2897 ℃, and the peak temperature decreases by 695 ℃. With the increasing of scanning spacing, the temperature of each scanning area decreases, and the peak temperature of position point 3 gradually decreases from 3330 ℃ to 3123 ℃. Under the same forming process parameters, the former path of laser scanning has a pre-heating effect on the latter path, and with the increasing of scanning path, the temperature of forming area shows a gradual upward trend. Pre-heating the substrate to 120 ℃ can increase the internal temperature of molten pool, reduce the temperature difference between the formed parts, and reduce the temperature gradient difference. When the laser power increases, the width and depth of molten pool increase, and when the laser scanning speed increases, the width of molten pool first increases and then decreases, and the depth of molten pool decreases linearly and reversely. With the increasing of scanning spacing, both the width and depth of molten pool decrease. The temperature field simulation conclusion obtained by simulation can roughly reflect the change trend of the surface quality of formed samples and the melting state of alloy powder with the forming process parameters.

Funds：

广东省自然科学基金面上项目（2020A151501806）；广东省普通高校特色创新类项目（2019GKTSCX105，2021KTSCX310）；中山职业技术学院高层次人才科研项目（KYG2105）

谢英星(1982-)，男，博士，副教授 E-mail：36596530@qq.com

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