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High temperature fatigue behaviors of a cast ferritic stainless steel

机译：铸铁素体不锈钢的高温疲劳行为

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摘要

This work investigated the high temperature low cycle fatigue (LCF) behavior of ACI HB20-type, cast ferritic stainless steel. In addition to the preliminary results from tension test, isothermal strain controlled fatigue tests were carried out at 600℃ and 800℃ The total strain amplitudes applied to the samples were from ±0.25% to ±0.65% with a strain rate of 10~(-3)/s. The fatigue lifetime curves at each temperature were obtained based on Basquin and Coffin-Manson equations. Also, these temperature dependent plots were re-constructed into a general superposition curve and compared to other heat resistant stainless steels. Additionally, microstructure and fractured surface after LCF test were analyzed using a scanning electron microscopy suggesting that the crack initiated at the grain boundary of the surface and propagated intergranularly as well as transgranularly. This is attributed by the formation of Cr and Nb carbide along the grain boundaries.
机译：这项工作研究了ACI HB20型铸造铁素体不锈钢的高温低循环疲劳（LCF）行为。除拉伸试验的初步结果外，还在600℃和800℃下进行了等温应变控制疲劳试验。施加在样品上的总应变幅度为±0.25％至±0.65％，应变率为10〜（- 3）/秒。根据Basquin和Coffin-Manson方程获得了每个温度下的疲劳寿命曲线。而且，这些与温度有关的曲线被重新构建为一条一般的叠加曲线，并与其他耐热不锈钢进行了比较。另外，使用扫描电子显微镜对LCF测试后的显微组织和断裂表面进行了分析，表明裂纹始于表面的晶界，并且沿晶间以及沿晶间扩展。这归因于沿晶界形成的Cr和Nb碳化物。

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