Nanoindentation characterization on the temperature-dependent fracture mechanism of Chinese 316H austenitic stainless steel under creep-fatigue interaction

被引：10
|
作者：
Song, Yuxuan [1 ]
Pan, Zhouxin [1 ]
Li, Yuebing [1 ]
Jin, Weiya [1 ]
Gao, Zengliang [1 ,2 ]
Wu, Zhenggang [3 ]
Ma, Yi [1 ,4 ]
机构：
[1] Zhejiang Univ Technol, Inst Proc Equipment & Control Engn, Coll Mech Engn, Hangzhou 310014, Peoples R China
[2] Minist Educ, Engn Res Ctr Proc Equipment & Remfg, Hangzhou, Peoples R China
[3] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China
[4] Nanjing Tech Univ, Key Lab Light weight Mat, Nanjing 210009, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2022年 / 186卷
基金：
中国国家自然科学基金;
关键词：
Austenitic stainless steel; Creep-fatigue interaction; Nanoindentation; Strain rate sensitivity; Fracture mechanism; STRAIN-RATE SENSITIVITY; DEFORMATION-BEHAVIOR; HARDNESS;
D O I：
10.1016/j.matchar.2022.111806
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Since the generation-IV nuclear reactors are aiming to operate at higher temperature, the effect of temperature on the creep-fatigue fracture behavior of 316H austenitic stainless steel were studied using nanoindentation technique. The results indicate that intergranular crack was gradually inconspicuous with increasing temperature from 823 to 923 K. However, as the temperature further increased to 973 K, fracture mechanism was found to be dominated by intergranular cracking. Based on the ex-situ mechanical properties at the nanoscale, i.e., hardness (H), elastic modulus (E), and strain rate sensitivity (m) of the fracture edge, a structural damage indicator ln(H/ E)/m was proposed to characterize the damage of grain boundaries, for unfolding the relationship between fracture mechanism of creep-fatigue interaction and temperature.
引用
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页数：9
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