镍基合金断弧脉冲氩弧焊堆焊层组织及腐蚀磨损性能

发布时间：2018-04-27 17:52

本文选题：镍基合金 + 断弧脉冲氩弧焊　；参考：《中国表面工程》2017年02期

【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。
[Abstract]:ERNi Cr-3 Ni base alloy was surfaced on the surface of 38Cr Si steel by arc breaking pulse argon arc welding. The microstructure and phase structure of the surfacing layer were characterized. The corrosion and wear tests were carried out under artificial seawater corrosion environment. The curve of potential variation with time and the values of corrosion wear components were measured. The corrosion and wear properties of the coating surface and the interaction between corrosion and wear were discussed. The results show that the surface of surfacing layer has fine columnar austenitic structure, the width of HAZ and fusion zone is about 150 渭 m and 200 渭 m, respectively. The new arc breaking pulse argon arc welding technology based on "one pulse and one arc" arc characteristics is explained. The metallurgical combination of small heat affected zone can be realized. Between corrosion and wear of nickel-based alloy surfacing layer, the amount of wear promoting corrosion is 0.12% of the weight loss of corrosion and wear interaction, which indicates that the effect of wear on corrosion is very small. Corrosion accelerates the wear of 34.88% of the wear, indicating that corrosion has a great effect on the promotion of wear. The corrosion and wear test potential of Ni-base alloy surfacing layer showed an increasing trend with time, which indicated that the corrosion and wear resistance of the passivated film was improved after it was damaged. The distribution of Cl and O elements in the brittle delamination zone of the nickel base alloy surfacing layer shows that chlorine embrittlement is one of the important reasons leading to corrosion and wear of the surfacing layer.
【作者单位】：装甲兵工程学院再制造技术重点实验室;装甲兵工程学院表面工程重点实验室;
【分类号】：TG455

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