Probing the fatigue enhancement in a thermally aged cast duplex stainless steel by in situ neutron diffraction

被引：2

作者：

Yu, Dunji ^{[1
]}

Guo, Can ^{[2
]}

Fu, Sichao ^{[3
]}

Chen, Yan ^{[1
]}

An, Ke ^{[1
]}

Yu, Weiwei ^{[4
]}

Chen, Xu ^{[2
]}

机构：

[1] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA

[2] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[3] Oak Ridge Natl Lab, Neutron Technol Div, Oak Ridge, TN 37831 USA

[4] Suzhou Nucl Power Inst, Suzhou 240051, Peoples R China

来源：

SCRIPTA MATERIALIA | 2024年 / 252卷

基金：

中国国家自然科学基金;

关键词：

Neutron diffraction; Phase stress; Cast duplex stainless steels; Fatigue; Thermal aging; LOW-CYCLE FATIGUE; DEFORMATION-BEHAVIOR; PHASE; MECHANISMS;

D O I：

10.1016/j.scriptamat.2024.116252

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

After long-term thermal aging at 400 degrees C for 3000 h and 10,000 h, a cast duplex stainless steel exhibits promoted fatigue performance, including enhanced three-stage cyclic hardening and prolonged fatigue life. Utilizing in situ neutron diffraction, the phase-specific stresses are resolved, and their evolutions over entire fatigue cycling reveal the underlying mechanisms of the fatigue enhancement. It is found that the ferrite phase bears a much higher stress than the austenite matrix under both as-received and aged conditions. The enhanced cyclic hardening in Stage I is attributed to the strengthening of both phases due to thermal aging, while the enhancement in Stage III results from the martensitic transformation induced strengthening. The fatigue life is prolonged thanks to the cyclic hardening and the delay of martensitic transformation in the austenite phase after thermal aging.

引用

页数：6

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