Declined Fatigue Crack Propagation Rate of a High-Strength Steel by Electropulsing Treatment

被引：14

作者：

Ben, Dandan ^{[1
,2
]}

Yang, Huajie ^{[1
,2
]}

Ma, Yunrui ^{[1
,2
]}

Wang, Qiang ^{[1
,2
]}

Tian, Yanzhong ^{[3
]}

Zhang, Peng ^{[1
,2
]}

Duan, Qiqiang ^{[1
,2
]}

Zhang, Zhefeng ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Mat Fatigue & Fracture Div, Shenyang 110016, Liaoning, Peoples R China

[2] Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China

[3] Northeastern Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China

来源：

ADVANCED ENGINEERING MATERIALS | 2019年 / 21卷 / 07期

基金：

中国国家自然科学基金;

关键词：

crack-healing; crack propagation rate; electropulsing; fatigue; high-strength steel; PHASE-TRANSFORMATIONS; FRACTURE MECHANISM; RESIDUAL-STRESS; CURRENT-DENSITY; BEHAVIOR; MICROSTRUCTURE; ALLOY; RECRYSTALLIZATION; LIFE;

D O I：

10.1002/adem.201801345

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The fatigue crack propagation behavior is a key issue for the service of engineering materials. The effect of electropulsing treatment (EPT) on the growth of fatigue crack in a high-strength steel (AISI 4340 steel) is investigated. It is shown that the crack propagation rate could be significantly declined via high-density EPT. The crack features of fracture surface are examined using laser scanning confocal microscopy (LSCM) and scanning electron microscopy (SEM). The crack deviation, local crack-healing and bridging phenomenon are proposed to be beneficial to lower the crack propagation rate, which should be brought out by the current detour, selective Joule heating, compressive stress, and electrical breakdown phenomenon. All these EPT effects exhibit significant contributions to the improvement of fatigue properties in the widely used high-strength steel.

引用

页数：8

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