激光熔覆304不锈钢涂层的工艺及组织  

Preparation and microstructure of 304 stainless steel layer by laser cladding

作　　者：徐鹏[1] 林成新[1] 周超玉[1] 宋志成[1] 

机构地区：[1]大连海事大学载运工具运用工程系,辽宁大连116026

出　　处：《材料热处理学报》2013年第7期142-146,共5页Transactions of Materials and Heat Treatment

基　　金：辽宁省教育厅重点实验室项目(LS2010016);中央高校基本科研业务费专项资金资助(2012TD011;2011QN049)

摘　　要：采用预置粉末的方法,在45号钢表面激光熔覆304不锈钢涂层,通过调整各项工艺参数得到了表面平整光滑与基体结合紧密的熔覆层。分析和解释了不同扫描速度对熔覆层及热影响区截面尺寸的影响规律;研究了扫描速度对稀释率的影响。结果表明:当速度为800 mm/min时,稀释率出现极值11.1%,当扫描速度为600 mm/min和1000 mm/min时,稀释率接近于合理值10%;熔覆层由铁素体和奥氏体双相组成,自界面处到顶端逐渐由单一粗大的柱状晶向尺寸为5～8μm的致密细小的等轴晶过渡;热影响区分为淬火区和正火区,分别由细小针状马氏体组织和细小的铁素体组成,基材由铁素体和珠光体组成。Smooth and glossy 304 stainless steel layers tightly bound to substrate was prepared by presetting 304 stainless steel powder on surface of 45 steel and layer cladding.Effect of different laser scanning speeds on the cladding layers and heat affected zone was examined,and influence of the scanning speeds on dilution rate was also studied.The results show that the dilution rate increases with increasing the scanning speed a maximum value of 11.1% at the scanning speed of 800 mm/min,and then decreases,and the dilution rate,which is about 10% when the speed is 600 and 1000 mm/min at the cladding layer is composed of ferrite and austenite,whih the microstructure of big columnar crystals to small equiaxed grains of 5 to 8 μm from the bottom to the top of the clad layer.Heat affected zone consists of quenched and normalized zones which is composed of fine martensite and ferrite,respectively.Microstructure of the substrate consists of ferrite and pearlite.

关 键 词：激光熔覆 304不锈钢 扫描速度 显微组织 

分 类 号：TG174.44[金属学及工艺—金属表面处理]