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激光同轴送粉增材制造TiAl合金的性能

Properties of TiAl Alloy Prepared by Additive Manufacturing with Laser Coaxial Powder Feeding

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摘要

将Ti-48Al-2Cr-2Nb合金粉和铌粉进行机械混合, 然后采用激光增材制造工艺成功制备出γ-TiAl合金样品, 研究了激光功率、扫描速率和送粉量对沉积成形的影响规律, 分析了沉积层的显微组织、相组成、断口形貌及沉积层的硬度分布。研究结果表明:随着激光功率增大, 沉积层宽和层高均增大; 随着扫描速率增大, 沉积层宽和层高均减小; 随着送粉量增大, 沉积层的宽度增大, 沉积层的高度基本不变; 最佳工艺参数下得到的沉积试样成形良好, 无冶金缺陷存在, 沉积层由大量γ相和少量α2相组成; 沿沉积试样Z方向的室温压缩屈服强度为905 MPa, 抗压强度为1542 MPa, 压缩率14.7%, 抗拉强度为425 MPa, 断后伸长率为3.3%; 压缩试样和拉伸试样的断口均为准解理断口。

Abstract

The alloy powders containing Ti-48Al-2Cr-2Nb and niobium are mechanically mixed, and γ-TiAl alloy samples are successfully prepared with the laser additive manufacturing technique. The influence rules of laser power, scanning speed and powder feeding amount on deposition forming are studied, and the microstructure, phase composition, fracture morphology and hardness distribution of the deposited layer are analyzed. The research results indicate that the width and height of the deposited layer increase with the increase of laser power. With the increase of the scanning speed, the width and height of the deposited layer decrease. With the increase of powder feeding amount, the width of the deposited layer increases and the height of the deposited layer is basically unchanged. The deposited samples obtained under the optimum technology parameters are well formed and have no metallurgical defects. The deposited layer consists of a large number of γ phases and a small amount of α2 phases. The compressive yield strength, compression strength and compression ratio are 905 MPa, 1542 MPa and 14.7% respectively along the Z direction of deposited specimen at room temperature. The tensile strength and elongation are 425 MPa and 3.3%, respectively. The fractures of compressive specimen and tensile specimen are both quasi-cleavage fractures.

Newport宣传-MKS新实验室计划
补充资料

中图分类号:TG146.2

DOI:10.3788/cjl201946.0302016

所属栏目:激光制造

基金项目:智能化增材制造系统平台(2017YFB1103000)

收稿日期:2018-11-19

修改稿日期:2018-12-05

网络出版日期:2018-12-21

作者单位    点击查看

刘占起:沈阳工业大学材料科学与工程学院, 辽宁 沈阳 110870
徐国建:沈阳工业大学材料科学与工程学院, 辽宁 沈阳 110870
马瑞鑫:沈阳工业大学材料科学与工程学院, 辽宁 沈阳 110870
郑文涛:沈阳工业大学材料科学与工程学院, 辽宁 沈阳 110870
胡方:沈阳工业大学材料科学与工程学院, 辽宁 沈阳 110870
杭争翔:沈阳工业大学材料科学与工程学院, 辽宁 沈阳 110870

联系人作者:徐国建(xuguojian1959@qq.com); 刘占起(1640754283@qq.com);

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引用该论文

Liu Zhanqi,Xu Guojian,Ma Ruixin,Zheng Wentao,Hu Fang,Hang Zhengxiang. Properties of TiAl Alloy Prepared by Additive Manufacturing with Laser Coaxial Powder Feeding[J]. Chinese Journal of Lasers, 2019, 46(3): 0302016

刘占起,徐国建,马瑞鑫,郑文涛,胡方,杭争翔. 激光同轴送粉增材制造TiAl合金的性能[J]. 中国激光, 2019, 46(3): 0302016

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