镍基耐蚀合金扩散均匀化处理及组织性能演变  

Diffusional homogenization treatment of Ni-Cr-Mo-Cu corrosion resistance alloy and evolutions of its microstructure and properties

作　　者：杨瑞成[1] 牛绍蕊[1] 王凯旋[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

出　　处：《江苏大学学报（自然科学版）》2009年第1期32-35,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：甘肃省有色金属新材料省部共建国家重点实验室基金资助项目(SKL05011)

摘　　要：基于三维扩散理论，对所研制的Ni—Cr—Mo—Cu铸态合金的均匀化、固溶处理工艺的有效性，以及对其显微组织、力学性能和耐蚀性能的演变进行了试验研究．研究结果表明：手工电弧炉熔炼、真空感应炉熔炼和真空自耗电极炉熔炼得到比较粗大的铸态组织（分别为约20μm的胞状结构、间距80～100μm的粗大树枝晶和60～80μm的方向性树枝晶），经1140～1170℃，2．5h的处理后，其胞状或枝晶组织消失、偏析组织达到均匀化．与铸态舍金相比，固溶状态合金在4种典型介质中的耐蚀性都获得提高（15％～25％以上），硬度、强度提高近30％；在盐酸、混合酸和FeCl，溶液中Ni—Cr—Mo—Cu合金的耐蚀性比1Cr18Ni9Ti奥氏体不锈钢提高1～3个数量级．通过扩散方程傅里叶级数解的分析，导得适合该耐蚀合金固溶处理时间的半经验公式．Using three-dimensional diffusion theory, the homogenization treatment of newly-developed as-cast Ni - Cr - Mo - Cu alloys and evolutions of its microstructure and properties were studied. The results showed that the coarser as-cast microstructures from three melting methods, hand-arc furnace（fine cellular structures about 20 μm cell size）, vacuum induction furnace （coarse dendritic structures about 80 100 μm spacing）and consumable electrode vacuum arc furnace（ well-developed directional dendrites about 60 - 80 μm spacing） , all disappeared and segregated mierostruetures were homogenized after solution treatment at 1 140 - 1 170 ℃ for 2.5 h. Compared with the as-cast alloys, the corrosion resistance of the as-solution alloys in four kinds of typical corrosive agents was improved （ above 15% - 25% ）. Both hardness and strength were increased by about 30%. The present Ni - Cr - Mo - Cu alloy has excellent corrosion resistant ability, especially in FeCl3 and HCl solutions, about 2 - 3 orders as high as 1Cr18Ni9Ti. Through analysis of the Fourier series solution for diffusion equation, the semi-experiential formula of solution treating time was derived for the as-cast Ni - Cr - Mo - Cu alloys.

关 键 词：镍基耐蚀合金 均匀化 耐蚀性 力学性能 傅里叶级数解 

分 类 号：TG133.4[一般工业技术—材料科学与工程] TG174.2[金属学及工艺—合金]