摘要
为得到无裂纹激光γ-TiAl合金单道沉积层,采用组合参数法研究沉积层的几何形状、裂纹、显微硬度、微观结构。结果表明,随着粉末密度的增大,沉积层高度增加,随着比能量的提高,沉积层高度下降、深度升高;当比能量和粉末密度分别为60~130 J/mm^(2)和1.2~2.8 g/mm 2时,沉积层表面光滑、无裂纹、且无未熔颗粒;随着粉末密度的增大,显微硬度从310 HV_(0.3)增加到610 HV_(0.3),随着比能量的增大,显微硬度从374 HV_(0.3)下降到306 HV_(0.3);高的比能量和低的粉末密度下的柱状晶和等轴晶组织较为粗大。通过组合参数找到无裂纹激光γ-TiAl合金的单道沉积层,研究结果可为激光金属沉积成型技术制备γ-TiAl合金提供参考。
In order to obtain laser single deposition layer ofγ-TiAl alloy without crack,the combined parameter method was used to study the geometry,crack,microhardness and microstructure of the deposited layer.The results show that the deposited layer height increases with the increase of powder density,with the increase of specific energy,the height of the deposited layer decreases while the depth of the deposited layer increases;when the specific energy and powder density are 60—130 J/mm^(2)and 1.2—2.8 g/mm^(2)respectively,the surface of the deposited layer in this area is smooth,free of cracks and unmelt particles;with the increase of powder density,the microhardness increases from 310 HV_(0.3)to 610 HV_(0.3),with the increase of specific energy,the microhardness decreases from 374 HV_(0.3)to 306 HV_(0.3);at high specific energy and low powder density,the columnar and equiaxed crystal structures are coarse.The crack free laser is found by combining parameters single pass deposition ofγ-TiAl alloy,the results of this study can provide reference for laser metal deposition molding technologyγ-TiAl alloy.
作者
李晓磊
袁岗
张可伦
崔陆军
徐春杰
张国君
郭士锐
LI Xiaolei;YUAN Gang;ZHANG Kelun;CUI Lujun;XU Chunjie;ZHANG Guojun;GUO Shirui(School of Mechanical and Electrical Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China;School of Material Science and Engineering,Xi′an University of Technology,Xi′an 710048,China)
出处
《有色金属工程》
CAS
北大核心
2022年第9期25-30,共6页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(52105499)
河南省自然科学基金(202300410514)
河南省高校重点科研项目(20A460031,20A460033)
中原工学院基本科研业务费专项资金项目(K2019QND06)。
关键词
增材制造
Γ-TIAL合金
组合参数法
裂纹
显微组织
additive manufacturing
γ-TiAl alloy
combined parameters method
crack
microstructure
