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首页> 外文期刊>Materials science forum >Metallurgy of Highly Wear-Resistant Indefinite-Chill Work Roll Materials for Hot Rolling Mills
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Metallurgy of Highly Wear-Resistant Indefinite-Chill Work Roll Materials for Hot Rolling Mills

机译：用于热轧机的高度耐磨无限寒冷工作辊材料的冶金

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Indefinite-chill materials are used as shell materials for cast work rolls for surface-critical applications in hot rolling mills. Besides a smooth surface quality, a low sticking tendency and low sensitivity against incidents in the rolling mill, the work rolls need the highest wear resistance possible. The microstructure of the indefinite-chill material consists of various carbides (cementite up to 40 area-%) and up to 5 area-% of graphite embedded in tempered martensite. To increase the wear resistance of this material group, the comparably soft cementite has to be replaced by more wear resistant carbides such as MC, M_2C or M_6C. This can be achieved by increasing the amount of carbide forming elements such as Nb, V, Mo, W or Cr. Nevertheless it is important to maintain a certain amount of graphite in the microstructure to avoid sticking to the rolled material and to lower the sensitivity against mill incidents. It is well known that high amounts of carbide forming elements limit the graphite precipitation and therefore a sophisticated alloying concept is required for this material type. Not only the effects of matrix elements such as Si, Mn, Ni and Co but also the effects of Cr, Mo, W, Nb and V were studied in an intensive research project. This work gives an insight in the results of the project based on the example of the effects of Si and Cr on the phase amounts and the composition of the cementite phase.
机译：无限期的冷却材料用作铸造工作辊的壳材料，用于热轧机中的表面关键应用。除了平滑的表面质量外，工作辊还需要低粘性趋势和对轧机事件的低灵敏度，需要最高的耐磨性。无限寒冷材料的微观结构由各种碳化物（渗碳盐高达40个区域）和嵌入钢制马氏体中的石墨的最多5个面积％。为了提高该材料基团的耐磨性，相当软的渗碳石必须用更耐磨的碳化物如MC，M_2C或M_6C代替。这可以通过增加诸如Nb，V，Mo，W或Cr的碳化物形成元素的量来实现。然而，重要的是在微观结构中保持一定量的石墨，以避免粘附到轧制材料上并降低对磨机事件的灵敏度。众所周知，大量的碳化物形成元件限制石墨沉淀，因此这种材料类型需要复杂的合金化概念。不仅在一个密集的研究项目中研究了基质元素如Si，Mn，Ni和Co，也是Cr，Mo，W，Nb和V的影响的影响。这项工作基于Si和Cr对相量的效果和渗碳渗阶段的组成的实施例，对该项目的结果进行了识别。

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