Damage mechanism and fatigue strength prediction of compacted graphite iron with different microstructures

被引：11
作者：
Chen, Y. [1 ,2 ]
Pang, J. C. [1 ]
Li, S. X. [1 ]
Zou, C. L. [1 ]
Zhang, Z. F. [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shi changxu Innovat Ctr Adv Mat, 72 Wenhua Rd, Shenyang 110016, Peoples R China
[2] Zhengzhou Univ, Henan Inst Adv Technol, 97 Wenhua Rd, Zhengzhou 450001, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2022年 / 164卷
基金：
中国国家自然科学基金;
关键词：
Compacted graphite iron; Pearlite content; Fatigue strength; Damage mechanism; ELASTIC-MODULUS; CAST-IRON; DUCTILE; TEMPERATURE; BEHAVIOR; MORPHOLOGY; ELEMENTS; MODEL; SIZE;
D O I：
10.1016/j.ijfatigue.2022.107126
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The effects of microstructures on the tensile properties, high-cycle fatigue properties and corresponding damage mechanism of compacted graphite iron (CGI) were investigated. The results show that with the increase of pearlite content, both the tensile strength and fatigue strength show an upward trend. Fatigue cracks usually initiate at the graphite/ferrite interface and gradually propagate into the matrix under the high-frequency cyclic stress. The adjacent cracks bridge to form the main crack, leading to the final fracture. Based on the pearlite content and tensile strength, a new model for predicting the fatigue strength of CGI with high accuracy was proposed.
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页数：14
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