电渣堆焊高铬铸铁硬面层结合界面及磨损性能  

Bonding interface and wear ploperty of high chromium cast iron by electroslag hardfacing layer

作　　者：王皓[1] 余圣甫[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《焊接》2018年第1期49-53,共5页Welding & Joining

摘　　要：用电渣堆焊的方法在低合金钢上堆焊高铬铸铁硬面层,讨论了电流、电压及装配间隙等工艺参数对渣池功率密度以及硬面层成形质量的影响,对硬面层及堆焊界面进行了组织观察和耐磨损性能分析。结果表明:热输入过大会导致低合金钢过熔,而热输入过小则会在堆焊界面产生夹渣和未熔合;热输入功率密度为6~6.5W/mm^2时,电渣堆焊可以在低合金钢上堆焊大厚度无缺陷高铬铸铁硬面层;堆焊层与基体结合良好;高铬铸铁硬面层平均硬度700 HV,约为低合金钢基材硬度的2倍;摩擦失重为低合金钢基体摩擦失重的27.3%,高铬铸铁硬面层耐磨粒磨损性能优势明显。The high chromium cast iron(HCCI)hardfacing coating was deposited on low alloy steel(LAS)by electroslag surfacing method.The microstructures of composite layer were observed by optical microscopy,scanning electron microscope,and X ray fluorescence.The hardness and wear resistance of HCCI hardfacing coating were measured.Meanwhile,the effects of process parameter such as welding current,welding voltage,and cavity size on power input and forming quality were discussed in detail.The results illustrate that the high thickness HCCI hardfacing layer without defect can be achieved at the power input of 6-6.5 W/mm and the thickness of transition zone is about 500μm.The average hardness of HCCI hardfacing layer(700 HV)is about 2 times of that of the LAS substrate.The abrasion weight loss of hardfacing layer is 27.3% of low alloy steel,which shows an obvious advantage in wear resistance.

关 键 词：电渣堆焊 高铬铸铁 工艺参数 熔合线 耐磨性能 

分 类 号：TG448[金属学及工艺—焊接]