Improving Intergranular Stress Corrosion Cracking Resistance in a Fe–18Cr–17Mn–2Mo–0.85N Austenitic Stainless Steel Through Grain Boundary Character Distribution Optimization

查看全文 作　　者：[1]F.Shi;[1]L.Yan;[1]J.Hu;[1]L.F.Wang;[1]T.Z.Li;[1]W.Li;[1]X.J.Guan;[3]C.M.Liu;[1,2]X.W.Li 机构地区：[1]Department of Materials Physics and Chemistry,School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;[2]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;[3]Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2022年第35卷第11期,共13页 基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51871048 and 52171108);the Fundamental Research Funds for the Central Universities(Grant Nos.N2002014 and N2202011)。 摘　　要：The grain boundary character distribution(GBCD) optimization and its effect on the intergranular stress corrosion cracking(IGSCC) resistance in a cold-rolled and subsequently annealed Fe-18 Cr-17 Mn-2 Mo-0.85 N high-nitrogen nickel-free austenitic stainless steel were systematically explored.The results show that stacking faults and planar slip bands appearing at the right amount of deformation(lower than 10%) are beneficial cold-rolled microstructures to the GBCD optimization.The proportion of special boundaries gradually increases in the subsequent stages of recrystallization and grain growth,accompanying with the growth of twin-related domain in the experimental steel.In this way,the fraction of low ∑ coincidence site lattice(CSL) boundaries can reach as high as 82.85% for the specimen cold-rolled by 5% and then annealed at 1423 K for 72 h.After GBCD optimization,low ∑ CSL boundaries and the special triple junctions(J2,J3) of high proportion can greatly hinder the nitride precipitation along grain boundaries and enhance the capability for intergranular crack arrest,thus improving the IGSCC resistance of the experimental steel. 关 键 词：High-nitrogen austenitic stainless steel Grain boundary character distribution Coincidence site lattice(CSL)grain boundary Electron backscatter diff raction(EBSD) Intergranular stress corrosion cracking