Dislocation accumulation-induced strength-ductility synergy in TRIP-aided duplex stainless steel

Wan, Jianquan1,2,3; He, Binbin4; Yang, Xusheng5; Kong, Lingbing3; Zuo, Xiaowei1,2; Jiao, Zengbao6

2024-11-01

10.1016/j.ijplas.2024.104130

INTERNATIONAL JOURNAL OF PLASTICITY   影响因子和分区

0749-6419

1879-2154

In this study, we investigate the intrinsic mechanism of intensive and progressive transformation- induced plasticity (TRIP) effects and their different strength-ductility synergies using a resource- efficient 15Cr-2Ni duplex stainless steel. The progressive TRIP material exhibits a ductility that is more than twice that of the intensive TRIP material, as well as, a larger product of the ultimate tensile strength and ductility. This is attributed to the dislocation accumulation caused by different grain sizes of strain-induced martensite depending on the stability of the gamma phase, which determines the strength and work hardening of steel. When the stability is low, the gamma phase is sensitive to loaded stress and transformed into dispersed fine martensite immediately after yielding at a high rate. It induces a sigmoid-shaped dislocation accumulation to an approximately 10-fold increase in the dislocation density at a limited strain, resulting in intensive work hardening and a large ultimate tensile strength. As the stability is adequate, the gamma phase is transformed into coarse martensite laths with a high critical load stress, which is initiated from a delayed strain at an extremely low rate and steadily accelerated as the strain increases. This process induces a gradually increased dislocation accumulation to a 2-3-fold increase in the dislocation density at large strains, resulting in progressive work hardening and an excellent ductility.

Metallic material Microstructure Phase transformation Dislocations Strength-ductility synergy

SCI

英语

其他

Guangdong Basic and Applied Basic Research Foundation[2020B1515120002] ; Open research fund of Songshan Lake Materials Laboratory[2023SLABFN12] ; National Key R&D & D Program of China[2020YFA0406101]

Engineering ; Materials Science ; Mechanics

Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics

WOS:001320952800001

PERGAMON-ELSEVIER SCIENCE LTD

Web of Science

1.Great Bay Univ, Sch Phys Sci, Dongguan Key Lab Interdisciplinary Sci Adv Mat & L, Dongguan 523000, Peoples R China
2.Great Bay Inst Adv Study, Dongguan 523000, Peoples R China
3.Shenzhen Technol Univ, Coll New Mat & New Energies, Shenzhen 518118, Peoples R China
4.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
5.Hong Kong Polytech Univ, Adv Mfg Technol Res Ctr, Dept Ind & Syst Engn, Kowloon, Hong Kong, Peoples R China
6.Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

Wan, Jianquan,He, Binbin,Yang, Xusheng,et al. Dislocation accumulation-induced strength-ductility synergy in TRIP-aided duplex stainless steel[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2024,182.

Wan, Jianquan,He, Binbin,Yang, Xusheng,Kong, Lingbing,Zuo, Xiaowei,&Jiao, Zengbao.(2024).Dislocation accumulation-induced strength-ductility synergy in TRIP-aided duplex stainless steel.INTERNATIONAL JOURNAL OF PLASTICITY,182.

Wan, Jianquan,et al."Dislocation accumulation-induced strength-ductility synergy in TRIP-aided duplex stainless steel".INTERNATIONAL JOURNAL OF PLASTICITY 182(2024).