The damage mechanism of tension-tension fatigue interaction with creep damage of the compacted graphite cast iron alloy at high temperatures

被引：0
作者：
Yue, Wu [1 ]
Zehui, Pei [2 ]
Zhijun, Ma [1 ]
Zhong, Yang [1 ]
Yongchun, Guo [1 ]
Minxian, Liang [1 ]
Jianping, Li [1 ]
Hua, Chen [3 ]
机构：
[1] Shaanxi Prov Engn Res Ctr Aluminium Magniesum Ligh, Sch Mat & Chem Engn, Xian, Peoples R China
[2] Henan Diesel Engine Co LTD, Luoyang, Peoples R China
[3] Xian Technol Univ, Sch Mechatron Engn, Xian 710021, Peoples R China
来源：
MATERIALS RESEARCH EXPRESS | 2023年 / 10卷 / 09期
关键词：
compacted graphite cast iron; creep-fatigue interaction; time-dependent deformation; intergranular crack; transgranular crack; THERMAL-CONDUCTIVITY; STRENGTH;
D O I：
10.1088/2053-1591/acfb5d
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The tension-tension fatigue test of the compacted graphite cast iron (CGI) alloy was carried out by RDL100 universal testing at 500 & DEG;C and 550 & DEG;C, respectively. A tension-tension trapezoidal load is applied to the CGI specimen. Because of the time-dependent deformation at elevated temperatures, the stress-strain curve presents hysteresis loops, and the area of the hysteresis loop increases gradually with continuous cyclic loading and sustained loading times. Intergranular and transgranular cracks in the microstructure accelerate the CGI alloy fracture failure. The fatigue life is sensitive to the short loading time and decreases with the sustained loading time exponentially under the tension-tension fatigue condition. The short holding time has a great influence on the fatigue life of CGI. The fatigue behavior of CGI alloys and the influence of holding time on the fatigue life can be characterized by y = aexp(bx) (a and b are constants, can be fitted through the test data). In addition, the fatigue life of CGI alloy can be predicted by the ductility depletion method. But the equivalent stress amplitude needs to be modified to eliminate the effects of oxidation damage.
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页数：14
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