载气流量及搭接率对激光熔覆涂层形貌和应力场的影响
Effects of carrier gas flow and overlap rate on morphology and stress field of laser clad coatings
王嘉圣 1李云峰 1石岩 2唐术锋 1姜广君 1武建新1
作者信息
- 1. 内蒙古工业大学机械工程学院,内蒙古呼和浩特 010051
- 2. 长春理工大学机电工程学院,吉林长春 130022;国家国际光学科技合作基地,吉林长春 130022
- 折叠
摘要
采用5 kW CO2激光器在42CrMoA钢表面制备Ni45合金涂层,研究载气流量和接搭率对Ni45合金激光熔覆涂层的影响.采用有限元方法研究搭接率对涂层温度场和应力场的影响.采用气固两相流理论、FLUNT软件对送粉过程中的粉末流态进行有限元分析,研究载气流量对涂层形貌的影响.结果表明,随着搭接率的增大,熔覆层应力逐渐升高,导致涂层裂纹增多.通过300℃保温缓冷处理消除涂层裂纹.当搭接率＜40％时,涂层平整度较差.当搭接率≥40％时,涂层平整度较好且相差不大.当载气流量≤450 L/h时,涂层表面较平整.当载气流量＞450 L/h后,涂层表面平整度开始下降.最佳熔覆工艺参数为载气流量450 L/h、搭接率40％.
Abstract
5 kW CO2 laser was used to prepare Ni45 coating on the surface of 42CrMoA steel.The effects of carrier gas flow and overlap rate on the quality of the Ni45 clad coating were studied.Finite element method was used to study the effect of overlap rate on the temperature and stress fields of the molten coating.The gas-solid two-phase flow theory and FLUNT software were used to analyze the powder flow pattern in the powder feeding process,and study the influence of carrier gas flow on the coating morphology.The results show that the stress and cracks gradually increase with the increase of the overlap rate in the clad layer,while the coating cracks can be eliminated through a 300 ℃isothermal annealing treatment.When the overlap rate is＜40％,the flatness of the coating is poor,but when the overlap ratio is≥40％,the coating flatness is good and shows no much different.When the carrier gas flow≤450 L/h,the coating surface is flat,but when the carrier gas flow＞450 L/h,the flatness of the coating begins to decrease.By studying the effects of the overlap rate and carrier gas flow,the optimal cladding process parameters are obtained:the carrier gas flow is 450 L/h,and the overlap rate is 40％.
关键词
激光熔覆/载气流量/搭接率/温度场/应力场Key words
laser cladding/carrier gas flow/overlap rate/temperature field/stress field引用本文复制引用
基金项目
内蒙古自治区自然科学基金青年基金(2023QN05013)
内蒙古自治区直属高校基本科研业务费项目(JY20220262)
内蒙古工业大学科研启动金项目(DC2200000878)
内蒙古自治区高等学校创新团队发展计划(NMGIRT2213)
内蒙古自治区直属高校基本科研业务费项目(JY2022016)
出版年
2024
NETL
NSTL
万方数据