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本文研究了Cu、Mn、N等合金元素对Ni-Cu-Cr系铸铁轧辊材料的组织、硬度、耐磨性、韧性和冷热疲劳性能的影响。目的是探讨以Ni-Cu-Cr系铸铁轧辊代替Ni-Cr系铸铁轧辊的可行性。实验表明,富Cu相生成是降低材料性能的主要原因。本实验条件下,富Cu相容易在γ-Fe=Cu+Fe_3C的共析转变中生成,影响富Cu相生成的主要因素是Cu、Ni,Cr含量和冷却速度。实验证实,分别以0.5％,2.0％Cu,相应取代中、高Ni-Cr轧辊材料中的Ni时,均无富Cu相生成,其主要性能指标可达到Ni-Cr系铸铁轧辊材料的水平。用Ni-Cu-Cr系铸铁轧辊材料铸造的轧辊已上轧机进行考核,初步轧制效果令人满意。
In this paper, the effects of alloying elements such as Cu, Mn and N on the microstructure, hardness, wear resistance, toughness and hot and cold fatigue properties of Ni-Cu-Cr cast iron roll materials were studied. The purpose is to investigate the feasibility of replacing Ni-Cr cast iron rolls with Ni-Cu-Cr cast iron rolls. Experiments show that the Cu-rich phase formation is the main reason to reduce the material properties. Under the experimental conditions, Cu-rich phase is easily formed during the eutectoid transformation of γ-Fe = Cu + Fe_3C, and the main factors affecting the Cu-rich phase formation are Cu, Ni, Cr content and cooling rate. Experiments show that when 0.5% and 2.0% Cu are respectively substituted for Ni in medium and high Ni-Cr roll materials, no Cu-rich phase is formed, and its main performance index can reach the level of Ni-Cr cast iron roll material. The roll cast by Ni-Cu-Cr cast iron roll material has been evaluated by the rolling mill, and the preliminary rolling effect is satisfactory.