文献类型：期刊文献

英文题名：Scale-up fabrication of gradient AGS in austenitic stainless steels achieves a simultaneous increase in strength and toughness

作者：Huang, Minghao[1];Wang, Lingyu[1];Yuan, Sen[1];Wang, Jinliang[2];Wang, Chenchong[1];Mogucheva, Anna[3];Xu, Wei[1]

机构：[1]Northeastern Univ, Sch Mat Sci & Engn, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China;[2]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524000, Peoples R China;[3]Belgorod State Univ, Lab Mech Properties Nanoscale Mat & Superalloys, Belgorod 308015, Russia

年份：2022

卷号：853

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：SCI-EXPANDED(收录号：WOS:000844303000002)、、EI(收录号：20223412591606)、Scopus(收录号：2-s2.0-85135878600)、WOS

基金：This study was financially supported by the National Natural Science Foundation of China (No. U1808208, and 51961130389) , and the in- ternational/regional cooperation and exchange program of the NSFC (NSFC-RFBR, No. 52011530032) .

语种：英文

外文关键词：Gradient structure; Charpy impact toughness; Grain size; Austenitic steel; Heterogeneous deformation

外文摘要：Simultaneous strengthening and toughening of austenitic stainless steel are of great importance in safety-critical applications. Gradient structured steels have thus attracted significant interest as they can achieve unprecedented strength and toughness synergy. However, the traditional fabrication process of gradient metals is relatively complex and limited to small depths of gradient. In this contribution, we have developed a novel processing route consisting of inhomogeneous rolling and annealing to fabricate a large gradient profile (similar to 5 mm) in the austenite grain size. The fabricated bulk gradient austenitic steel exhibits higher tensile strength (similar to 690 MPa) and Charpy impact energy (11.8 J) compared with the uniform-grain-size structural steel (similar to 650 MPa and 10.9 J, and similar to 580 MPa and 11.3 J for fine grained (FG) and coarse grained (CG) steels). The deformation mechanisms of the bulk gradient austenitic steel were further explored. The combined contribution of the hetero-deformation induced (HDI) strengthening and transformation-induced plasticity (TRIP) effect results in the ideal work-hardening capability and tensile strength of the gradient austenitic steel. Thanks to the deep gradient, the fraction of deformation-induced martensite decreases along the fabricated gradient. The pronounced TRIP effect near the coarse-grained V-notch improves the crack initiation energy (E-i), while the less martensite formed in the fined-grained interior raises the crack propagation energy (E-p). This study provides new insights into the circumvention of the strength-toughness trade-off and the fabrication of gradient structured steels with a large gradient profile.