Planar dislocation structure during creep-fatigue interactions of TP347H heat-resistant austenitic steel at 600 °C

被引：21
|
作者：
Zhou, Hongwei [1 ,2 ]
Zhang, Hongyan [1 ,2 ]
Bai, Fengmei [3 ,4 ]
Song, Meng [1 ,4 ]
Chen, Yan [1 ,2 ]
Zhang, Liqiang [3 ]
Fang, Xudong [5 ]
He, Yizhu [1 ,2 ]
机构：
[1] Anhui Univ Technol, Key Lab Green Fabricat & Surface Technol Adv Met, Minist Educ, Maanshan 243002, Peoples R China
[2] Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002, Anhui, Peoples R China
[3] Anhui Univ Technol, Sch Met Engn, Maanshan 243002, Anhui, Peoples R China
[4] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110189, Peoples R China
[5] Taiyuan Iron & Steel Grp Co Ltd, State Key Lab Adv Stainless Steel, Taiyuan 030003, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 779卷
基金：
中国国家自然科学基金;
关键词：
Heat-resistant austenitic steel; Creep-fatigue; Low cycle fatigue; Fatigue fracture mode; Planar slip structure; LOW-CYCLE FATIGUE; GRAIN-BOUNDARY CARBIDES; 316L STAINLESS-STEEL; INTERACTION BEHAVIOR; PREDICTION METHODS; DAMAGE MECHANISM; LIFE PREDICTION; DEFORMATION; EVOLUTION; PRECIPITATION;
D O I：
10.1016/j.msea.2020.139141
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The low-cycle fatigue (LCF) and creep-fatigue (CF) interaction tests of TP347H austenitic stainless steel are carried out in air under a fully-reversed strain amplitude of 1.0% at 600 degrees C. A 10 min tensile dwell is applied in CF interaction testing. The influences of dwell on dislocation structures and fracture behavior have been evaluated. It is found that CF interaction life is lower than LCF one. The fatigue fracture mode changes from transgranular crack under LCF to transgranular plus intergranular fracture with tensile dwell. A lot of dislocation planar slip bands (PSBs) were found under CF interaction condition. PSB interacts with PSB of another slip system, twins, grain boundary (GB), and triangular GB. Strongly PSB-GB interaction causes stress concentration at GB, creating cavities and crack initiation, causing intergranular fracture. The stress concentration within the PSBs will also cause cracks, resulting in transgranular fracture morphology with fatigue striation.
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页数：11
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