Fatigue and fracture behavior of nickel-based superalloy Inconel 718 up to the very high cycle regime

被引：52

作者：

Ma, Xian-feng ^{[1
]}

Duan, Zheng ^{[1
]}

Shi, Hui-ji ^{[1
]}

Murai, Ryosuke ^{[2
]}

Yanagisawa, Eiichi ^{[2
]}

机构：

[1] Tsinghua Univ, Appl Mech Lab, Dept Engn Mech, Sch Aerosp, Beijing 100084, Peoples R China

[2] Mitsubishi Heavy Ind Co Ltd, Tokyo, Japan

来源：

JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A | 2010年 / 11卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Nickel-based superalloy; High cycle fatigue (HCF); Fatigue crack initiation; Crack growth; Life prediction; SUBSURFACE CRACK INITIATION; HIGH-TEMPERATURE; IN-100; SUPERALLOY; GROWTH-BEHAVIOR; LIFE; MODEL; STEEL; MICROMECHANISMS; PREDICTION; STRENGTH;

D O I：

10.1631/jzus.A1000171

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The fatigue and fracture behavior of nickel-based superalloy Inconel 718 was investigated up to the very high cycle regime under rotary bending tests at room temperature. It was found that this superalloy can still fracture after exceeding 107 cycles. Fractographic analysis revealed that there was a transition from fatigue crack initiation at multi-sites to single initiation with decreasing stress levels. The fracture surface can be divided into four areas according to the appearance, associated with fracture mechanics analysis of the corresponding stress intensity factors. The fracture mechanism dominant in each area was disclosed by scanning electron microscope examination and analyzed in comparison with those obtained from the crack growth tests. Subsequently, life prediction modeling was proposed by estimating the crack initiation and propagation stage respectively. It was found that Chan (2003)'s model for initiation life and the Paris law for growth life can provide comparable predictions against the experimental life.

引用

页码：727 / 737

页数：11

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