摘要
裂纹作为激光熔覆过程中常见的缺陷,严重阻碍了激光熔覆技术的发展和应用。熔覆层裂纹的产生是由于激光熔覆加工冷却后熔覆层与基材热膨胀系数不同,熔覆层内元素偏析等原因产生了应力,主要分为约束应力、热应力、组织应力。本文提出通过在粉末中加入陶瓷粉末或稀土元素,改良激光功率、熔覆速度等参数,对材料进行热处理,施加电磁辅助场条件等措施来降低裂纹产生率,并分析了未来熔覆层裂纹控制发展与研究的方向。
As a common defect in laser cladding,the cracks are seriously hindered the development and application of laser cladding.The stress causes the cracks by the different thermal expansion coefficient between the cladding layer and the substrate material after laser cladding,the element segregation in the cladding layer.It is including constraint stress,thermal stress and structural stress.In order to reduce the incidence rate of crack,it is proposed to add ceramic powder or rare earth elements into the powder,improving the parameters such as laser power and cladding speed,heat treatment of the material,and apply electromagnetic auxiliary field conditions.Analyzing the future development and research direction of crack control in cladding layer.
作者
侯锁霞
任呈祥
吴超
赵江昆
张舵
张好强
HOU Suoxia;REN Chengxiang;WU Chao;ZHAO Jiangkun;ZHANG Duo;ZHANG Haoqiang(College of Mechanical Engineering,North China University of Science and Technology,Tangshan 063210,China;Department of Transportation and Vehicle Engineering,Tangshan University,Tangshan 063000,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第S01期352-356,共5页
Materials Reports
基金
国家自然科学基金(52074128)。
关键词
激光熔覆
裂纹
应力
改善方法
laser cladding
crack
stress
improved method
