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Experimental characterization of the short crack growth behavior of a ductile cast iron (DCI GJS-500) affected by intergranular embrittlement at temperatures nearby 400 ∘C
International Journal of Fatigue ( IF 6 ) Pub Date : 2021-10-08 , DOI: 10.1016/j.ijfatigue.2021.106573
Elena Garcia Trelles 1 , Stefan Eckmann 1 , Christoph Schweizer 1
Affiliation  

In this investigation, the fatigue and crack growth behavior of the ductile cast iron material (DCI) GJS-500 was experimentally characterized by performing isothermal low cycle fatigue (LCF) tests, out-of-phase thermomechanical fatigue (OPTMF) tests as well as low cycle fatigue tests combined with the replica testing method (LCF-R) within the temperature range RT–500 °C. The studied material exhibits an embrittlement at temperatures nearby 400 °C, leading to a significant higher fatigue crack growth rate and a reduced lifetime, when compared with RT and 500 °C. A possible explanation for the observed higher fatigue crack growth rate coupled with a significant lifetime reduction, is intergranular embrittlement.



中文翻译:

受晶间脆化影响的球墨铸铁 (DCI GJS-500) 在 400 ∘ C 附近的短裂纹扩展行为的实验表征

在这项研究中,球墨铸铁材料 (DCI) GJS-500 的疲劳和裂纹扩展行为通过等温低周疲劳 (LCF) 测试、异相热机械疲劳 (OPTMF) 测试以及在 RT–500 °C 的温度范围内,结合复制测试方法 (LCF-R) 进行低周疲劳测试。与 RT 和 500 °C 相比,所研究的材料在 400 °C 附近的温度下表现出脆化,导致疲劳裂纹扩展速率显着提高,寿命缩短。观察到的较高疲劳裂纹扩展速率以及显着的寿命缩短的一个可能解释是晶间脆化。

更新日期:2021-10-14
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