Gigacycle fatigue of high-strength steel caused by MnS inclusions
Gigacycle fatigue of high-strength steel caused by MnS inclusions
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DOI：
10.1016/j.msea.2021.141840
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发表时间：
2021-09
期刊：
影响因子：
6.4
通讯作者：
Y. Furuya
中科院分区：
文献类型：
--
作者：
Y. Furuya
对含有大量MnS的高强度钢进行了不同加工比的疲劳试验。通过纵向和横向疲劳试验研究了各向异性。疲劳强度与较高的工作率呈正相关，表明高工作率提高了疲劳强度。各向异性也被观察到，表明在纵向上的疲劳强度高于那些在横向上。断裂方式为内部断裂，主要来源于MnS夹杂。在高加工比下，MnS呈细长形状。夹杂物的大小与工作比率呈负相关，在高工作比率下观察到较小的夹杂物大小。夹杂物的尺寸在纵向上小于在横向上。这些结果进行了分析，使用在以前的研究中得出的预测。结果表明，加工比的影响可以用夹杂物尺寸来解释。MnS和氧化物之间的差异不大，因为当夹杂物尺寸相当时，两种夹杂物显示出几乎相同的效果。各向异性，一些其他因素比夹杂物的大小略有影响的疲劳性能，降低疲劳强度在横向上。
Gigacycle fatigue tests were conducted on high-strength steels that contained large amounts of MnS and which had been subjected to different working ratios. Anisotropy was also investigated by fatigue testing in both the longitudinal and transverse directions. The fatigue strengths were positively correlated with higher working ratios, revealing that high working ratios improved fatigue strength. Anisotropy was also observed, indicating that the fatigue strengths in the longitudinal direction were higher than those in the transverse direction. The fracture mode was internal fractures, mostly originating from MnS inclusions. The MnS showed long slender shapes under high working ratios. The inclusion sizes were inversely correlated with working ratios, with small inclusion sizes seen under high working ratios. The inclusion sizes were smaller in the longitudinal direction than in the transverse direction. These results were analyzed by using a prediction derived in the previous study. The results showed the effect of working ratios to be explained by inclusion size. There was little difference between MnS and oxides in that both inclusions revealed almost identical effects when the inclusion sizes were comparable. Anisotropically, some other factor than inclusion size slightly affected the fatigue properties, reducing the fatigue strength in the transverse direction.