A brittle fracture mechanism in thermally aged duplex stainless steels revealed by in situ high-energy X-ray diffraction

被引：13
|
作者：
Li, Shilei [1 ,2 ]
Wang, Tiancheng [1 ]
Tan, Qing [1 ]
Li, Runguang [1 ]
Wang, Yanli [1 ]
Wang, Xitao [3 ]
Ren, Yang [4 ]
Wang, Yandong [1 ]
机构：
[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[2] Argonne Natl Lab, Appl Mat Div, 9700 S Cass Ave, Argonne, IL 60439 USA
[3] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China
[4] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2019年 / 739卷
基金：
北京市自然科学基金; 中国国家自然科学基金;
关键词：
High-energy X-ray diffraction; Duplex stainless steels; Thermal aging; Spinodal decomposition; G-PHASE PRECIPITATION; LOW-CYCLE FATIGUE; MICROMECHANICAL BEHAVIOR; TRANSFORMATION; EMBRITTLEMENT; TEMPERATURE; FERRITE; PROBE;
D O I：
10.1016/j.msea.2018.10.025
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A direct relationship between the microstructural evolution and macroscopic fracture behaviors of a thermally aged (at 475 degrees C for 400 h) duplex stainless steel (DSS) has been established with experimental results from atom probe tomography (APT), nanoindentation and in situ synchrotron-based high-energy X-ray diffraction (HE-XRD). The APT experiments demonstrate that ferrite in DSS spinodally decomposes into Cr-enriched and Cr-depleted domains during thermal aging, which leads to a severe hardening effect in ferrite. The lattice strain development during deformation acquired with the in situ HE-XRD measurements confirms the cleavage fracture of alpha{110} and alpha{200} ferrite grains aligned perpendicular to loading direction. The thermally aged DSS can be readily fractured by connecting the cleavage cracks in ferrite. The spinodal-decomposition-induced hardening in ferrite and the premature failure of ferrite control the final brittle fracture in the aged DSS.
引用
收藏
页码：264 / 271
页数：8
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