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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural Characteristics of Prematurely Failed Cold-Strip Mill Work-Rolls: Some Observations on Spelling Susceptibility
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Microstructural Characteristics of Prematurely Failed Cold-Strip Mill Work-Rolls: Some Observations on Spelling Susceptibility

机译：冷轧带钢轧机过早失效的显微组织特征：拼写敏感性的一些观察

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摘要

A comprehensive metallurgical investigation was carried out on samples of prematurely failed cold-strip mill work-rolls used in an integrated steel plant to study the influence of microstructural characteristics on failure propensity and roll life. The samples pertained to 3 wt. percent Cr-base forged steel work-rolls, which exhibited variations in roll life despite operation under similar mill environments. Optical and SEM revealed that while a uniform dispersion of fine globular carbides was conducive to higher roll life, carbides of angular and/or elongated morphologies acted as stress-raisers, induced microcracking of the tempered martensite matrix, and accentuated eventual spalling. From the standpoint of nonmetallic inclusions, higher life rolls were cleaner. Low/poor life rolls showed higher incidences of MnS and angular TiN inclusions, which often provided sites for the precipitation of undesirable elongated carbides. Although microprobe analysis indicated that carbides in these rolls were essentially M7C3, quantitative metallography revealed that, apart from morphology, roil performance was profoundly influenced by carbide content and count. Interestingly, while higher life rolls were characterized by carbide contents of >4.S vol. percent and counts of >200,000 number/mm~2, rolls exhibiting low and poor lives showed significantly lower values of these features. X-ray diffractometry of spalled roll specimens indicated that while higher life rolls contained minimal retained austenite, rolls exhibiting lower lives inevitably contained >10 percent retained austenite. The deleterious effect of excessive retained austenite on the spalling susceptibility of cold-strip mill work-rolls was attributed to its possible transformation to martensite under imposed rolling stresses.
机译：对在一家综合钢铁厂中使用的过早失效的冷轧机工作辊样品进行了全面的冶金研究，以研究微观结构特征对失效倾向和辊寿命的影响。样品占3重量％。 ％的铬基锻钢工作辊，尽管在相似的轧机环境下运行，但轧辊寿命仍会变化。光学和扫描电镜显示，尽管细小球形碳化物的均匀分散有利于延长轧辊寿命，但角形和/或拉长形态的碳化物充当应力增强剂，引起回火马氏体基体的微裂纹，并最终加剧剥落。从非金属夹杂物的角度来看，使用寿命更长的材料更清洁。低/低寿命轧辊显示出更高的MnS和角TiN夹杂物发生率，这通常为不希望的细长碳化物析出提供了场所。尽管微探针分析表明这些轧辊中的碳化物本质上是M7C3，但定量金相分析显示，除形态外，轧制性能还受碳化物含量和数量的深刻影响。有趣的是，虽然高寿命轧辊的特征是碳化物含量> 4.S vol。百分率和计数> 200,000个数字/ mm〜2，寿命低和寿命差的卷筒的这些特征值明显较低。散裂辊试样的X射线衍射分析表明，虽然高寿命辊中的残留奥氏体含量极低，但低寿命辊中不可避免地含有大于10％的残余奥氏体。残余奥氏体过多对冷轧带钢工作辊剥落敏感性的有害作用归因于在强加的轧制应力下其可能转变为马氏体。

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