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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Microstructural study and residual stress measurement of a hot rolling work roll material during isothermal oxidation
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Microstructural study and residual stress measurement of a hot rolling work roll material during isothermal oxidation

机译：等温氧化过程中热轧工作辊材料的微观结构研究和残余应力测量

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摘要

Compact oxide scale at a high speed steel (HSS) work roll surface during hot rolling process can act as an effective solid lubricant and a protective layer for better product surface quality. In this study, considering practical hot rolling process time, microstructure and surface roughness of three oxide scales on a HSS work roll have been systematically characterized with a help of scanning electron microscopy (SEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). It has been found that growth of the oxide scale follows a parabolic rate law and the dominant oxide phase is hematite. In addition, surface roughness increases dramatically when the oxidation time is less than 30min and then changes slightly, when the HSS specimens were isothermally oxidized at 600 degrees C in a dry air. Residual stress evolutions with oxidation time have also been examined in details using X-ray diffraction (XRD) method. Measurement of microhardness at the HSS specimen surface revealed that development of defects and decrease of compressive residual stress in the oxide layer lead to a slight decrease in the microhardness.
机译：热轧工艺期间高速钢（HSS）工作辊表面的紧凑型氧化物尺度可作为有效的固体润滑剂和保护层，用于更好的产品表面质量。在本研究中，考虑到实际的热轧工艺时间，HSS工作辊上的三种氧化物鳞片的微观结构和表面粗糙度已经系统地具有扫描电子显微镜（SEM），原子力显微镜（AFM）和透射电子显微镜的帮助（TEM）。已经发现，氧化物量表的生长遵循抛物率法，并且优势氧化相是赤铁矿。另外，当氧化时间小于30min时，表面粗糙度显着增加，然后在干燥空气中在600℃下等温氧化时，稍微改变。还使用X射线衍射（XRD）方法详细检查具有氧化时间的残余应力演进。 HSS样本表面上的微硬度测量显示氧化物层中的缺陷和压缩残余应力的降低导致微硬度的略微降低。

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