The mechanism of internal fatigue-crack initiation and early growth in a titanium alloy with lamellar and equiaxed microstructure

被引：42

作者：

Pan, Xiangnan ^{[1
,2
]}

Xu, Shouwen ^{[1
,2
]}

Qian, Guian ^{[1
,2
]}

Nikitin, Alexander ^{[3
,4
]}

Shanyavskiy, Andrey ^{[5
]}

Palin-Luc, Thierry ^{[6
]}

Hong, Youshi ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China

[3] Univ Paris Ouest Nanterre Def, LEME, 50 Rue Serves, F-92410 Ville Davray, France

[4] MAI Natl Res Univ, 4 Volokolamskoe Hwy,A-80,GSP-3, Moscow 125993, Russia

[5] Aviaregister, Air Sheremetevo 1,POB 54, Moscow Reg 141426, Chimkovskiy Sta, Russia

[6] Univ Bordeaux, Arts & Metiers Inst Technol, CNRS, Bordeaux INP,INRAE,I2M Bordeaux,Esplanade Arts &, F-33405 Talence, France

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 798卷

基金：

中国国家自然科学基金;

关键词：

Titanium alloy; Crack initiation; Facet; Very-high-cycle fatigue; Lamellar microstructure; HIGH-CYCLE FATIGUE; GIGACYCLE FATIGUE; TI-6AL-4V; BEHAVIOR; TORSION; REGIME; FRACTURE; TI6A14V; DUALITY; TENSILE;

D O I：

10.1016/j.msea.2020.140110

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Traditionally, equiaxed alpha grains rather than lamellar microstructure (LM) domains in titanium alloys are regarded as potential internal crack origins in high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) re-gimes. Here, we found that the fatigue crack is prone to initiate from a large LM domain in a titanium alloy with the composition of LM and equiaxed microstructure (EM) of fine alpha grains. Then, the mechanisms of internal crack initiation and early growth for the cases of HCF and VHCF under stress ratio R =-1, 0.1 and 0.5 were addressed and a mechanism chart was constructed to illustrate the internal cracking behavior, especially showing that the numerous cyclic pressing process dominates the related microstructure evolution with grain size refinement and nanograin formation underneath the fracture surfaces in the region of crack initiation and early growth.

引用

页数：14

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