Fatigue strength optimization of compacted graphite cast iron processed by austempering process

被引：0
作者：
Teng, X. Y. [1 ,2 ]
Tan, B. Z. [1 ,3 ,4 ,5 ]
Pang, J. C. [1 ]
Chen, Y. [1 ,2 ]
Zou, C. L. [1 ]
Shi, F. [3 ,4 ]
Li, S. X. [1 ]
Zhang, Z. F. [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
[3] Northeastern Univ, Sch Mat Sci & Engn, Dept Mat Phys & Chem, Shenyang 110819, Peoples R China
[4] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China
[5] Liaoning Acad Mat, Inst Coating Technol Hydrogen Gas Turbines, Shenyang 110167, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2025年 / 932卷
基金：
中国国家自然科学基金;
关键词：
Compacted graphite cast iron; Austempering; Tensile strength; High-cycle fatigue strength; Damage mechanism; MECHANICAL-PROPERTIES; MICROSTRUCTURE; TEMPERATURE; ADI;
D O I：
10.1016/j.msea.2025.148271
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The fatigue property optimization of compacted graphite cast iron (CGI) by the austempering process was investigated. The austenitizing at 850 degrees C firstly then austempering at 280 degrees C and 370 degrees C respectively were selected. The tensile and fatigue properties and corresponding damage mechanism of the CGI and austempered CGI (ACGI) samples were carried out. The highest fatigue strength of 221 MPa for CGI materials was obtained by austempering at 370 degrees C. The fatigue strength decreases first and then increases in CGI and ACGI samples with the increase of austempering temperature. The general relation between the tensile and fatigue strength of CGI was further investigated. The corresponding physical significance in the relations was proposed based on the different defect morphologies in cast iron alloys, which provides implications for understanding the relation between metal fatigue and tensile strength and optimizing fatigue properties.
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页数：11
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