Effect of post-GBE strain-sensitisation on corrosion resistance of grain boundary engineered 304 austenitic stainless steel
Effect of post-GBE strain-sensitisation on corrosion resistance of grain boundary engineered 304 austenitic stainless steel
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DOI：
10.1080/14786435.2012.762467
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发表时间：
2013-04
影响因子：
1.6
通讯作者：
G. Yamada;H. Kokawa;Y. Yasuda;S. Tokita;T. Yokoyama;Y. Sato;H. Fujii;S. Tsurekawa
中科院分区：
文献类型：
--
作者：
G. Yamada;H. Kokawa;Y. Yasuda;S. Tokita;T. Yokoyama;Y. Sato;H. Fujii;S. Tsurekawa
晶界工程（GBE）的晶界组织控制是有效的，以防止晶间腐蚀的腐蚀性随机边界网络的断开，导致在大量奥氏体不锈钢退火孪晶频繁形成的过程中引入重合位置的晶格边界。由于奥氏体不锈钢的实际应用通常包括应变和加热工艺，例如成形、退火和焊接，GBE处理后的工艺可能会降低晶界工程（GBE ed）奥氏体不锈钢的优化晶界显微组织和高耐腐蚀性。因此，本研究探讨后GBE应变敏化的晶界显微组织和耐腐蚀性的GBE ed 304奥氏体不锈钢GBE的一步热机械加工生产的影响。结果表明，随着GBE后应变的增加，GBE钢的晶界组织发生明显变化，耐蚀性逐渐降低，但GBE钢在GBE后应变敏化过程中的耐蚀性明显高于同等应变敏化的基体钢。
Control of grain boundary microstructure for grain boundary engineering (GBE) is effective to prevent intergranular corrosion by disconnection of corrosive random boundary network resulting from the introduction of coincidence site lattice boundaries during the frequent formation of annealing twins in bulk austenitic stainless steels. Since the practical use of austenitic stainless steels often includes straining and heating processes, such as forming, annealing and welding, the processes after the GBE treatment could degrade the optimised grain boundary microstructure and the high corrosion resistance of grain boundary engineered (GBEed) austenitic stainless steels. Therefore the present study examined the effects of post-GBE strain-sensitisation on grain boundary microstructure and corrosion resistance of a GBEed 304 austenitic stainless steel produced by a single-step thermomechanical processing for GBE. The results showed that the grain boundary microstructure was changed apparently and the corrosion resistance gradually decreased in the GBEed steel with an increase in post-GBE strain followed by sensitisation, but the GBEed steel maintained significantly higher corrosion resistance during the post-GBE strain-sensitisation than the equivalently strain-sensitised base steel.