Effect of aging on the microstructure and properties of ASTM A890 3A duplex stainless steel

被引：10
作者：
Liu, Zhaoxian [1 ]
Xie, Yue [2 ]
Zhang, Lixin [1 ]
Zhao, Wenzhen [1 ]
Zhao, Chengzhi [3 ]
He, Huan [1 ]
机构：
[1] Yantai Univ, Sch Nucl Equipment & Nucl Engn, 30,Qingquan Rd, Yantai 264005, Peoples R China
[2] Aerosun Tola Expans Joint Co Ltd, 199,Moling St, Nanjing 211100, Peoples R China
[3] Harbin Engn Univ, Sch Mat Sci & Chem Engn, 145,Nantong St, Harbin 150001, Peoples R China
来源：
MATERIALS TODAY COMMUNICATIONS | 2023年 / 35卷
关键词：
Duplex stainless steel; Aging; Precipitated phase; Mechanical properties; Corrosion resistance; CRITICAL PITTING TEMPERATURE; SIGMA-PHASE FORMATION; MECHANICAL-PROPERTIES; CORROSION BEHAVIOR; PRECIPITATION; FERRITE; DECOMPOSITION; AUSTENITE; M23C6; RESISTANCE;
D O I：
10.1016/j.mtcomm.2023.106215
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Exposure of duplex stainless steels to high temperatures could result in microstructure changes generating precipitated phases and significantly affecting material properties. In this paper, the effects of aging at 450-850 & DEG;C on the microstructure and properties of ASTM A890 3A duplex stainless steel were studied. The microstructures were different after aging at different temperatures: only & gamma;2 was precipitated after aging at 450 and 550 & DEG;C, & gamma;2, M23C6, and & sigma; phases were observed at 650 & DEG;C, and an additional phase of & chi; was found at 750 & DEG;C. Aging at 450 & DEG;C increased the strength of duplex stainless steel while aging at other temperatures negligibly affected strength. Aging at 450 & DEG;C and 650-850 & DEG;C significantly decreased the impact toughness. Correspond-ingly, the fracture was partially or completely transformed from a ductile fracture mode before aging to a brittle fracture mode after aging. Aging deteriorated the corrosion resistance of duplex stainless steel. Aging at 750 & DEG;C had the most significant effect: the breakdown potential decreased by 28%, and the membrane resistance decreased by 81.9% relative to those without aging. The above changes in properties were closely related to the embrittlement of duplex stainless steel at 475 & DEG;C and the precipitation of the & sigma;-phase and & chi;-phase.
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页数：9
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