Characterizations of Fatigue Deformation and Fracture Behavior of Commercially Pure Iron with Grain Boundary Micro-voids

被引：2
作者：
Yun, Jong-Guk [1 ]
Cao, Xin-Ming [1 ]
Wang, Yue [2 ]
Kang, Yan [2 ]
Li, Xiao-Wu [1 ]
机构：
[1] Northeastern Univ, Coll Sci, Inst Mat Phys & Chem, POB 104 3-11 Wenhua Rd, Shenyang 110004, Peoples R China
[2] Northwestern Univ, Sino Dutch Biomed & Informat Engn Sch, Shenyang 110004, Peoples R China
来源：
MECHANICAL, MATERIALS AND MANUFACTURING ENGINEERING, PTS 1-3 | 2011年 / 66-68卷
基金：
中国国家自然科学基金;
关键词：
Pure iron; Micro-voids; Fatigue deformation; Fracture surface; Fractal dimension; CYCLIC DEFORMATION; SINGLE-CRYSTALS; ALPHA-IRON; CRACK INITIATION; CARBON CONTENT; SURFACES; COPPER; TEMPERATURE; ALLOY; CREEP;
D O I：
10.4028/www.scientific.net/AMM.66-68.1942
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fatigue deformation behavior of the commercially pure iron containing micro-voids at grain boundaries (GBs) were investigated under total strain amplitude control, and fatigue fractures were quantitatively characterized by fractal analyses. The cyclic response curves of the CP iron show an initial softening stage within early several cycles followed by a continuous cyclic hardening. No stress saturation phenomenon was found. Pre-existence of micro-voids at GBs spurs intergranular cracking to become a common damage mode besides transgranular cracking along slip bands. Quantitative analyses of fracture surface demonstrate that the value of fractal dimension D of the scanning profile in the crack growth zone is the largest as compared to those in the crack source zone and final rapid fracture area, almost regardless of the applied strain amplitude. This phenomenon was discussed in terms of the tortuosity of crack propagation path.
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页码：1942 / +
页数：2
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