镍基合金断弧脉冲氩弧焊堆焊层组织及腐蚀磨损性能  

Microstructure and Corrosion Wear Properties of Ni-based Alloy Layer Prepared by Interrupted Pulsed Argon Arc Welding

作　　者：孟令东[1,2] 谭俊[1,2] 臧艳[1,2] 郑晓辉[2] 张庆[2] MENG Ling-dong TAN Jun ZANG Yan ZHENG Xiao-hui ZHANG Qing(Science and Technology on Remanufacturing Laboratory, Academy of Armored Forces Engineering, Beijing 100072 Key Laboratory for Surface Engineering, Academy of Armored Forces Engineering, Beijing 100072)

机构地区：[1]装甲兵工程学院再制造技术重点实验室,北京100072 [2]装甲兵工程学院表面工程重点实验室,北京100072

出　　处：《中国表面工程》2017年第2期143-150,共8页China Surface Engineering

摘　　要：采用断弧脉冲氩弧焊技术,在38Cr Si钢表面堆焊ERNi Cr-3镍基合金,表征了堆焊层显微组织与相结构,通过人工海水腐蚀环境下的腐蚀磨损试验,测定了电位随时间变化曲线以及腐蚀磨损各分量数值,探讨了涂层表面腐蚀磨损性能以及腐蚀与磨损间的交互作用。结果表明:堆焊层表面呈细小的柱状晶奥氏体组织,热影响区与熔合区的宽度分别约150和200μm,说明基于"一脉一弧"新型电弧特性的断弧脉冲氩弧焊技术,能够实现较小热影响区的冶金结合。镍基合金堆焊层腐蚀与磨损之间,磨损促进腐蚀量为腐蚀磨损交互作用失重的0.12%,说明磨损对腐蚀的促进作用很小;腐蚀促进磨损量占磨损分量的34.88%,说明腐蚀对磨损的促进作用较大。镍基合金堆焊层腐蚀磨损试验的电位随时间呈上升趋势,说明钝化膜破损后的再形成能力提高了其在人工海水中的耐腐蚀磨损性能。镍基合金堆焊层表层金属脆性剥离区域有明显的Cl和O元素分布,说明氯脆是导致堆焊层腐蚀磨损的重要原因之一。ERNiCr-3 Ni-based alloy was prepared on 38CrSi steel by interrupted pulsed argon arc welding technology. Microstructure and phase structure of the welding layer was characterized. Based on the corrosion test in artificial seawater corrosion environment, curves of potential versus time and the corrosion wear value were measured, anti-corrosion wear property and interaction between corrosion and wear were also discussed. Results show that the austenitic with fine columnar crystal structure is formed on the surface of welding layer. The width of the heat affected zone and the fusion is about 150 and 200 μm respectively, which indicates that metallurgical combination with a smaller heat affected zone can be achieved based on ＂one pulse arc＂ disconnection pulsed argon arc welding technology. The weight of corrosion loss caused by wear behavior is 0.12% of the interaction total weight loss, indicating that the promoting effect of wear behavior on corrosion is very small. While the weight of wear loss caused by corrosion is 34.88% of total weight loss, corrosion has a larger promoting effect on wear behavior. Corrosion and wear potential of Ni based alloy welding layer increases with time, which indicates that the reformation of the passive film can improve the corrosion and wear resistance in in artificial sea water. Based on the result of distribution of chlorine and oxygen element on brittle zone of Ni based alloy welding layer, chlorine brittle of the alloy is one of the most important reasons leading to the corrosion and wear.

关 键 词：镍基合金 断弧脉冲氩弧焊 组织 腐蚀磨损 

分 类 号：TG455[金属学及工艺—焊接]