当前位置：首页 > 过刊浏览->2022年43卷第2期
工艺参数对 Ti48Al2Cr2Nb 合金单道 激光沉积组织的影响
Effect of Process Parameters on Microstructure of Ti48Al2AlCr2Nb Alloy Made by Single Laser Metal Deposition
浏览(1933) 下载(5)
- DOI:
- 作者:
- 李晓磊 1 ， 2 ，袁 岗 1 ，张可伦 1 ，崔陆军 1 ，郭士锐 1 ，崔英浩 1 ，徐春杰
LI Xiaolei 1,2 , YUAN Gang 1 , ZHANG Kelun 1 , CUI Lujun 1 , GUO Shirui 1 , CUI Yinghao 1 , XU Chunj
- 作者单位:
- 1. 中原工学院 机电学院，河南 郑州 450007；2. 西安理工大学 材料科学与工程学院，陕西 西安 710048
1. School of Mechanical and Electronic Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; 2. School of Material Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
- 关键词:
- 激光金属沉积成型技术； γ-TiAl 合金；表面形貌；显微组织
laser metal deposition technology; γ-TiAl alloy; surface morphology; microstructure
- 摘要:
- 通过激光金属沉积成型技术 (LMD) 技术制备了 Ti48Al2Cr2Nb 合金试样，研究了不同工艺条件下试样的表
面形貌、几何特征、裂纹、显微组织和显微硬度。 结果表明，激光功率对沉积层的形貌影响最大，随着激光功率的增加，沉
积层裂纹逐渐减少，熔宽逐渐增大；稀释率也随着激光功率的增大而增大，激光功率从 2 000 W 增加至 3 000 W 时，稀
释率从 0.334 % 增加到 0.764 % 。 同时，随着激光功率的增大，显微组织从柱状晶向等轴晶转变，沉积层显微组织主要由
α 2 相和 γ 相组成。在不同工艺参数条件下，显微组织中织构也发生变化。当激光功率增大时，显微硬度减小，当激光功率
达到 3 000 W 时，硬度值降为 386.3 HV 。
Ti48Al2Cr2Nb alloy samples were prepared by laser metal deposition (LMD) technology. The surface
morphology, geometric characteristics, cracks, microstructure and microhardness of the samples were studied under
different processing conditions. The results show that the laser power has the greatest influence on the morphology of the
sedimentary layer. With the increase of the laser power, the crack of the sedimentary layer decreases and the welding width
increases gradually. The dilution rate also increases with the increase of laser power. When the laser power increases from
2 000 W to 3 000 W, the dilution rate increases from 0.334% to 0.764%. At the same time, with the increase of laser
power, the microstructure changes from columnar crystal to equiaxed crystal, and the microstructure of the sedimentary
layer is mainly composed of α 2 and γ phases. Under the condition of different processing parameters, the texture of the
microstructure also changed. When the laser power increases, the microhardness decreases, and when the laser power
reaches 3 000 W, the hardness value decreases to 386.3 HV.