Specimens of cast iron rolls are studied after multiple operations of tempering at 300°C. X-ray diffraction and phase analyses are performed. The temperature of the start and finish of the phase transformations in the iron are determined. Tests for abrasive wear are conducted, and the hardness of the rolls is measured. It is shown that multiple tempering lowers the content of “soft” structural components in the rolls (retained austenite, bainite and graphite) and raises the content of hard phases (martensite and carbides), which elevates the hardness and the wear resistance of the working layer of the cast forming rolls.

中文翻译：

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回火对不定形铸铁两层成型轧辊组织和性能的影响

对铸铁轧辊试样进行了多次300℃回火后的研究。进行 X 射线衍射和相分析。确定铁中相变的开始和结束温度。进行磨粒磨损测试，并测量轧辊的硬度。结果表明，多次回火降低了轧辊中“软”组织成分（残余奥氏体、贝氏体和石墨）的含量，提高了硬相（马氏体和碳化物）的含量，从而提高了加工硬度和耐磨性。铸成型辊层。