中国激光, 2019, 46 (8): 0802003, 网络出版: 2019-08-13   

扫描方向对变厚度熔覆成形件组织与力学性能的影响 下载: 932次

Effect of Scanning Direction on Microstructure and Mechanical Properties of Part Formed via Variable Thickness Layer Cladding Deposition
作者单位
东北大学机械工程与自动化学院, 辽宁 沈阳 110819
摘要
针对于激光熔覆沉积成形工艺引起的拉伸强度各向异性的问题,基于变厚度熔覆层沉积方式,探究扫描方向(从高到低和从低到高)对斜坡薄壁件微观组织和力学性能的影响。测试斜坡薄壁件不同位置的拉伸强度和硬度,分析其微观组织形貌,并与等厚度熔覆层沉积方式进行对比。试验结果表明:在薄壁件的纵截面上,沿不同扫描方向沉积能改变晶粒的生长方向;晶粒生长方向和扫描轨迹能影响薄壁件不同位置的拉伸强度,且从低到高扫描沉积可明显减小抗拉强度的各向异性;在水平方向,不同扫描方向下的硬度变化趋势一致,且变厚度熔覆层沉积会改变薄壁件最大硬度的分布。
Abstract
To investigate the anisotropy of the tensile strength caused by laser cladding deposition, the influence of the scanning direction (from high to low and from low to high) on the microstructure and mechanical properties of the ramp's thin-walled part is explored based on the variable thickness cladding layer deposition. Tensile strength and hardness at different positions on the ramp's thin-walled part are tested, and its microstructure is analyzed by comparing it with that formed via uniform thickness cladding layer deposition. Results show that the grain growth direction in the longitudinal section is affected by the scanning direction when variable thickness cladding layer deposition is used. Furthermore, the grain growth direction and scanning track influence the tensile strength at different positions of the thin-walled part. Tensile strength anisotropy can be obviously reduced by depositing the variable thickness cladding layer in the scanning direction from low to high. In the horizontal direction, the change in hardness is consistent under different scanning directions. Additionally, variable thickness cladding layer deposition changes the maximum hardness distribution of the thin-walled part.

周显新, 辛博, 巩亚东, 张伟健, 张海权. 扫描方向对变厚度熔覆成形件组织与力学性能的影响[J]. 中国激光, 2019, 46(8): 0802003. Xianxin Zhou, Bo Xin, Yadong Gong, Weijian Zhang, Haiquan Zhang. Effect of Scanning Direction on Microstructure and Mechanical Properties of Part Formed via Variable Thickness Layer Cladding Deposition[J]. Chinese Journal of Lasers, 2019, 46(8): 0802003.

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