Improving the intergranular corrosion resistance of the weld heat-affected zone by grain boundary engineering in 304 austenitic stainless steel

被引：0
作者：
Institute of Materials, Shanghai University, Shanghai [1 ]
200072, China
不详 [2 ]
200444, China
机构：
[1] Institute of Materials, Shanghai University, Shanghai
[2] Key Laboratory for Microstructure, Shanghai University, Shanghai
来源：
Jinshu Xuebao | / 3卷 / 333-340期
关键词：
304 austenite stainless steel; Grain boundary engineering; Heat-affected zone; Intergranular corrosion; Welding;
D O I：
10.11900/0412.1961.2014.00552
中图分类号：
学科分类号：
摘要：
The heat-affected zone (HAZ) produced by welding in stainless steel has higher susceptibility to intergranular corrosion, which is attributed to the Cr depletion induced by grain-boundary carbide-precipitation. The grain boundary engineering can be used to control over the grain boundary structure, which has significant influence on the carbide precipitation and the associated Cr depletion and hence on the susceptibility to intergranular corrosion. The grain boundary network in a 304 austenite stainless steel can be controlled by grain boundary engineering (GBE) with 5% tensile deformation and subsequent annealing at 1100℃ for 30 min. The total length proportion of Σ3n coincidence site lattice (CSL) boundaries was increased to more than 75%, and the large-size highlytwinned grain-cluster microstructure was formed through the treatment of GBE. Specimens were welded by gas tungsten arc- welding. Then the microstructure and the corrosion resistance of HAZ were characterized. The result showed that the high proportion of low ΣCSL boundaries and the optimum grain boundary character distribution were stable in the HAZ of the grain boundary engineered stainless steel, and the grain size was nearly the same. The weld-decay region of GBE samples performed better intergranular corrosion resistance during the intergranular corrosion immersion experiment and electrochemical potentiokinetic reactivation (EPR) test. The reported results indicated that the grain boundary engineering can effectively improve the intergranular corrosion resistance of the heat-affected zone in 304 austenitic stainless steel. © Copyright.
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页码：333 / 340
页数：7
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