电流对等离子堆焊Fe90组织与性能的影响  

Effect of current on microstructure and properties of Fe90 alloy overlay coatings deposited by plasma transferred arc welding

作　　者：邓德伟[1,2,3] 刘海英[1] 张林[2] 孙奇[2] 杨树华[2] 宋茂付 郑海彤[1] 张敏[1] DENG De-wei LIU Hai-ying ZHANG Lin SUN Qi YANG Shu-hua SONG Mao-fu ZHENG Hal-tong ZHANG Min(School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China R＆D Division of Shenyang Blower Works Group Corporation, Shenyang 110869, China Key Laboratory of Solidification Control and Digital Preparation Technology （Liaoning Province） , Dalian 116024, China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]沈阳鼓风机集团股份有限公司研究院,辽宁沈阳110869 [3]辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116024

出　　处：《材料热处理学报》2017年第7期138-144,共7页Transactions of Materials and Heat Treatment

基　　金：国家"973"项目(2011CB013402);辽宁省自然科学基金(2014028002);辽宁省科技创新重大专项(201303002);辽宁重大装备制造协同创新中心;沈鼓-大工重大科研发展基金;中央高校基本科研业务费专项资金资助项目

摘　　要：利用等离子堆焊技术在304L不锈钢表面堆焊Fe90自熔性合金粉末。采用OM、XRD和TEM对堆焊层组织进行分析,用硬度计、环-块式摩擦磨损试验机和饱和甘汞电极对堆焊层的硬度、耐磨性和耐蚀性进行测试,研究焊接电流对堆焊层组织和性能的影响规律和作用机理。结果表明:Fe90堆焊层组织由马氏体,(Cr,Fe)_7C_3,CrFeB,CrB与Fe_3Si组成,硬度是基材的3.5~5.2倍,磨损量下降80%~85%,耐蚀性基本不变;堆焊电流为130 A时,堆焊层的硬度最高,耐磨性最佳。Fe90 self-fluxing alloy powder was deposited on 304L stainless surface by plasma transferred arc welding （PTAW）. Microstructure of the coatings was investigated by means of OM, XRD and TEM. The hardness, wear and corrosion resistance of the coatings were investigated by means of hardness test, ring-block friction and abrasion test and saturated calomel electrode. The effects of welding current on the mierostrueture and properties of the coatings were studied. It is found that the hardness of the coatings is 3, 5-5.2 times of that of the suhstrate and mass loss decreases by 80%-85% as well as corrosion resistance unchanged because the coatings are composed of martensitie, （ Cr, Fe） 7 C3, CrFeB, CrB and Fe3 Si phases. The hardness of the coatings is highest and wear resistance is best when the welding current is 130 A.

关 键 词：等离子堆焊 Fe90合金粉末 显微组织 硬度 耐磨性 耐蚀性 

分 类 号：TG456.2[金属学及工艺—焊接] TG455