Design of Heterogeneous Lamella Microstructure of 316L Austenitic Stainless Steel and Effect of Aging on Its Mechanical Behavior and Corrosion Properties

被引:0
|
作者
Liu, Chaoze [1 ]
Li, Shaohong [1 ]
Gao, Junkang [1 ]
Jia, Yunfei [1 ]
Li, Jun [1 ]
Bu, Hengyong [1 ]
Zhou, Liexing [1 ]
Qi, Huarong [1 ]
Li, Mengnie [1 ]
机构
[1] Kunming Univ Sci & Technol, Sch Mat Sci & Engn, Kunming 650093, Peoples R China
关键词
316L austenitic stainless steels; corrosion resistance; heterogeneous lamella microstructures; mechanical properties; thermal stability; STRAIN-INDUCED MARTENSITE; GRAIN-SIZE; DEFORMATION MECHANISM; PITTING CORROSION; FRACTURE-BEHAVIOR; COLD; RESISTANCE; 304-STAINLESS-STEEL; METALS; TRANSFORMATION;
D O I
10.1002/srin.202300860
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
316L austenitic stainless steel (ASS) with a heterogeneous structure exhibits favorable mechanical properties at room temperature, promising excellent application potential. However, the thermal stability of 316L ASS with heterogeneous lamella structure (HLS) has not been adequately addressed yet. Herein, an HLS of 316L ASS is fabricated through 78% cold rolling followed by annealing at 750 degrees C for 13 min. The detailed investigation focuses on the influence of microstructure evolution on the mechanical properties and corrosion resistance of the alloy after aging at temperatures ranging from 350 to 550 degrees C for 100 h. The results show that a notable quantity of residual martensite persists even after annealing at high temperatures for a brief duration. The dislocation density of the test steel is reduced after long-term aging treatment, and the residual martensite is further reversed into austenite during aging. In addition, the aging treatment also promotes further growth of nanocrystalline/ultrafine-grained, which weakens the heterogeneous characteristics of HLS 316L ASS, resulting in a slight decrease in mechanical properties. However, the decrease in defect density and the enhancement of recrystallization degree are beneficial for eliminating most of the corrosion-sensitive areas in the cold-deformed structure, thereby improving the corrosion resistance. The thermal stability of a heterogeneous lamella structure of 316L austenitic stainless steel is evaluated by subjecting it to a 100 h hold at temperatures ranging from 350 to 550 degrees C. The results indicate that as the aging temperature increases, the alloy's heterogeneous characteristics weaken, leading to a slight decrease in mechanical properties, but the pitting resistance of the alloy improves.image (c) 2024 WILEY-VCH GmbH
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页数:13
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