激光熔覆Fe基合金涂层微观组织与性能研究
Study on Microstructure and Properties of Laser Cladding Fe Based Alloy Coating
刘敬 1路小江 2钟善军2
作者信息
- 1. 宁波中意液压马达有限公司,浙江宁波 315200;山东航空学院滨州市航空结构件表面工程重点实验室,山东滨州 256600
- 2. 宁波中意液压马达有限公司,浙江宁波 315200
- 折叠
摘要
为提高45钢的表面性能,采用自行设计的新型Fe-Cr-Ni合金粉末,在45钢表面激光熔覆制备成型良好的Fe基合金涂层,分析熔覆层的微观组织及物相组成,并进行耐磨及抗高温氧化性能研究.研究结果表明,激光熔覆Fe基合金涂层组织均匀致密,涂层表面无明显裂纹、气孔等缺陷,物相主要为α-Fe、γ-(Ni-Cr-Fe)、γ-(Fe,Ni)、α-(Fe-Cr)以及Fe0.64Ni0.36金属间化合物;熔覆层的硬度达到720 HV,约为基体硬度的3.3倍;在60 N下进行干滑动摩擦磨损测试,熔覆层的摩擦系数为0.57,低于基体的摩擦系数0.73,熔覆层的平均磨损体积约为基体的18.8％;在500 ℃、700 ℃、900 ℃下经100 h高温氧化,熔覆层未出现氧化膜剥落现象,氧化增重分别为2.19 mg·cm-2、5.11 mg·cm-2、6.61 mg·cm-2.
Abstract
To enhance the surface properties of 45 steel,a self-designed Fe-Cr-Ni alloy powder was utilized to fabricate a well formed Fe-based alloy coating via laser cladding.The microstructure and phase composition of this coating were thoroughly ex-amined,and its wear resistance and high temperature oxidation resistance were evaluated.The results show that the micro-structure of laser cladding Fe based alloy coating is uniform and compact,there are no obvious defects such as cracks and pores,and the main phase is α-Fe、γ-(Ni-Cr-Fe)、γ-(Fe,Ni)、α-(Fe-Cr)and Fe0.64Ni0.36 intermetallic compounds;The hardness of the cladding layer reaches 720 HV,about 3.3 times of the matrix;Through the dry sliding friction and wear test,the friction coef-ficient of the cladding layer is 0.57,which is lower than that of the matrix.The wear volume of the cladding layer is 0.01 mm3,which is 18.8％of the average wear volume of the matrix;After 100 h high-temperature oxidation,there was no peeling of oxide film on the cladding layer.At 500 ℃,700 ℃ and 900 ℃,the oxidation weight gain was 2.19 mg·cm-2,5.11 mg·cm-2 and 6.61 mg·cm-2 respectively.
关键词
激光熔覆/Fe基合金涂层/微观组织/摩擦磨损/高温抗氧化性Key words
laser cladding/Fe based alloy coating/microstructure/friction and wear/high temperature oxidation resist-ance引用本文复制引用
基金项目
国家自然科学基金(52075047)
山东省高等学校青创科技支持计划(2022KJ089)
宁波市重大科技任务攻关项目(2022Z052)
出版年
2024
NETL
NSTL
万方数据