Unveiling the mechanism of yttrium significantly improving high-temperature oxidation resistance of super-austenitic stainless steel S32654

作     者：Shucai Zhang Huabing Li Zhouhua Jiang Hao Feng Zhejian Wen Junyu Ren Peide Han Shucai Zhang;Huabing Li;Zhouhua Jiang;Hao Feng;Zhejian Wen;Junyu Ren;Peide Han

作者机构：School of MetallurgyNortheastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education)Shenyang 110819China College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第115卷第20期

页      面：103-114页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：the National Natural Science Foundation of China(Nos.U1860204 and 52004061) the Talent Project of Revitalizing Liaoning(No.XLYC1802101) the China Postdoctoral Science Foundation(No.2020M670777) the Northeastern University Postdoctoral Funds(No.20200321) the Fundamental Research Funds for the Central Universities(No.N2125017) 

主　　题：Super-austenitic stainless steel Rare earth elements Yttrium Oxidation MoO_(3)volatilization Cr_(2)N precipitation 

摘      要：Aiming at serious catastrophic oxidation problem of super-austenitic stainless steel S32654,the influence of different rare earth elements on its oxidation behavior was comparatively investigated at 1200℃.The mechanism of Y significantly improving high-temperature oxidation resistance of S32654 was *** results demonstrated that Y played much better beneficial roles than Ce and La in the initial formation of oxide layer:(1)Y promoted Cr segregation to steel surface to combine with O;(2)its preferential oxidation provided nucleation cores for Cr_(2)O_(3).Both roles jointly promoted the selective oxidation of Cr and then the formation of protective Cr-rich oxide *** provided good prerequisites for inhibiting the formation and volatilization of MoO_(3).Additionally,Y cation segregation to oxide grain boundaries further promoted the selective oxidation of Cr and Si to form more protective oxide *** beneficial roles of Y essentially eliminated the synergistic effects of MoO_(3) volatilization and lamellar Cr_(2)N precipitation on catastrophic ***,the oxidation resistance of Y-bearing S32654 was improved by 22%–45%.