文档介绍：毕业论文
题目:电站T92钢性能及焊接技术综述
摘要
采用ERNiCr-3和ERNiCrMo-3两种镍基焊丝,用气体保护钨极电弧焊(GTAW)法实现T92/HR3C异种钢管焊接。研究了接头的显微组织及其力学性能,以及焊后热处理对接头组织结构及力学性能的影响等。结果表明:T92/HR3C异种钢接头焊缝为胞状树枝晶组织,T92侧热影响区(HAZ)主要由过热区、粗晶区及细晶区构成;HR3C侧HAZ没有明显晶粒长大的现象,但晶界、晶内有碳、氮化物析出。ERNiCrMo-3焊接接头的强度、塑性及硬度较高,拉伸断裂位于母材;而ERNiCr-3焊接接头强度、硬度较低,但冲击韧性较高,拉伸断裂位于焊缝。760℃、30 min焊后热处理,有助于改善两种焊接接头的综合力学性能。
Using ERNiCr-3 and ERNiCrMo-3 two nickel based welding, gas tungsten arc welding ( GTAW ) method to achieve T92 / HR3C dissimilar steel welding. Study of joint microstructure and mechanical properties, as well as the heat treatment after welding on the microstructure and mechanical properties of such structures. The results show that: the T92 / HR3C dissimilar steel welded joints for cellular dendrite organization, T92 side heat affected zone ( HAZ ) is mainly composed of superheated area, coarse and fine grained zone; HR3C side HAZ has no apparent grain growth phenomenon, but the grain boundary, in the crystal, nitride precipitation with carbon. ERNiCrMo-3 welded joint strength, ductility and hardness, tensile fracture in the parent material; and ERNiCr-3 welded joint strength, hardness is low, but the impact toughness is higher, tensile fracture in weld. 760 C, 30 min heat treatment after welding, contribute to the improvement of two welded joint mechanical properties.
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