表面自纳米化304L不锈钢/T2铜扩散连接  

Diffusion bonding of SSNC 304L/Cu

作　　者：罗军[1] 盛光敏[1] 袁新建[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《中南大学学报（自然科学版）》2013年第1期55-59,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50675234)

摘　　要：采用高能喷丸(HESP)对304L不锈钢棒端面进行表面自纳米化(SSNC)处理,在850℃下将不锈钢与铜棒进行600 s脉冲加压扩散连接(PPDB)。利用金相显微镜和显微硬度仪对不锈钢棒喷丸端面进行表征,测试接头拉伸强度,对断口和接头剖面进行SEM和EDS分析,并计算Cu原子在不锈钢中的扩散系数。实验结果表明:经SSNC处理在不锈钢表层获得大约60μm的剧烈塑性变形层。铜与经SSNC处理的不锈钢的接头平均抗拉强度达到228.2MPa,达到铜基体的83%,比铜与未经SSNC处理的不锈钢的接头的抗拉强度提高20%;铜原子在经SSNC处理的不锈钢中的扩散系数达到8.5×10 14m2/s,比在未经SSNC处理的不锈钢中高5倍。A 304L austenitic stainless steel, surface self-nanocrystallized （SSNC） by high-energy shot peening （HESP）, was studied by optical microscope and micro hardness tester. Original and SSNC 304L austenitic stainless steels were separately joined with copper through pulse-pressure diffusion bonding （PPDB） at 850 ℃ for 600 s. The joint strength was tested by a tensile machine, the longitudinal sections and tensile fractures of joints were analyzed by scanning electron microscope （SEM） and energy dispersive spectroscope （EDS）. Additionally, the diffusion coefficient of Cu atom in 304L austenitic stainless steel was achieved. The results show that a severe plastic deformation layer, about 60μm, was obtained after HESE The average recorded tensile strength of SSNC 304L/Cu joints is equal to 228.2 MPa, which is 83% of that of Cu bar, 20% more than that of the original 304L/Cu. The diffusion coefficient of Cu atom in SSNC 304L is 8.5× 10^-14 ma/s, five times higher than that in original 304L.

关 键 词：表面自纳米化 扩散连接 扩散系数 不锈钢 铜 

分 类 号：TG454[金属学及工艺—焊接]