摘要
为解决铸铁表面熔覆铁基合金熔覆层耐腐蚀性能不足,限制其应用场合的问题。采用大功率半导体光纤耦合激光器在灰铸铁平板上制备四种镍含量不同的铁基合金粉末熔覆层,利用光学显微镜、数显维氏硬度计,WTM-2E微型摩擦磨损试验仪及盐雾腐蚀箱等仪器对熔覆层金相显微组织、硬度、耐磨损和耐腐蚀性能进行检测。结果表明,四种铁基合金粉末熔覆层晶粒尺寸依次增大,晶粒数目减小,熔覆层硬度及耐磨性能降低,耐腐蚀性能提高。C铁基合金粉末熔覆层平均硬度550 HV_(0.3),相对于基材提高了3倍以上,耐磨性相对于基材提高了4倍,48 h腐蚀试验,较铁基合金熔覆层耐腐蚀性能显著增强,综合性能满足更多实际需求。本研究降低了铸铁件的修复成本,拓展了铁基合金修复铸铁件的应用范围,对工程实践具有重要指导意义。
To solve the problem of insufficient corrosion resistance of the iron-based alloy cladding layer on the surface of cast iron,which limits its application occasions.Four kinds of iron-based alloy powder cladding layers with different nickel content on gray cast iron plates are prepared using high-power semiconductor fiber coupled laser.Using optical microscope,digital vickers hardness tester,WTM-2E mini friction and wear tester and salt spray corrosion Boxes and other instruments to test the metallographic microstructure,hardness,wear resistance and corrosion resistance of the cladding layer.The results show that the grain size of the four kinds of iron-based alloy powder cladding layers increased successively,the number of grains decreased,the hardness and wear resistance of the cladding layer decreased,and the corrosion resistance improved.The average hardness of the iron-based alloy powder cladding layer of C is 550HV_(0.3),which is more than 3 times higher than that of the base material,and the wear resistance is 4 times higher than that of the base material.The 48-hour corrosion test,compared to iron-based alloy cladding layer corrosion resistance significantly enhanced,comprehensive performance to meet more practical needs.This research reduces the repair cost of iron castings,and expands the application range of iron-based alloy repair iron castings,which is of great guidance for engineering practice.
作者
郭士锐
赵阳
崔陆军
郑博
李晓磊
崔英浩
陈永骞
GUO Shi-rui;ZHAO Yang;CUI Lu-jun;ZHENG Bo;LI Xiao-lei;CUI Ying-hao;CHEN Yong-qian(School of Mechanical&Electronic Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China)
出处
《激光与红外》
CAS
CSCD
北大核心
2022年第8期1137-1142,共6页
Laser & Infrared
基金
河南省高等学校重点科研项目(No.20A460033,No.20A460031)
中国纺织工业联合会科学技术指导项目(No.2016085)
河南省科技攻关计划项目(No.202102210068)
河南省自然科学基金面上项目(No.212300410422)
安徽理工大学矿山智能装备与技术安徽省重点实验室开放基金项目(No.KSZN202002003)资助。
关键词
铸铁
激光熔覆
镍含量
显微组织
硬度
耐磨损
耐腐蚀
cast iron
laser cladding
nickel content
microstructure
hardness
wear resistance
corrosion resistance
