中南大学学报（自然科学版）2016，Vol.47Issue(7)：2213-2220,8.DOI:10.11817/j.issn.1672-7207.2016.07.005
冷却速率对高碳铬铁金相组织的影响
Effect of cooling rate on metallographic structure of high-carbon ferrochrome
摘要
Abstract
The metallographic structure of high-carbon ferrochrome (HCFC) cooled in furnace, air atmosphere and water bath respectively were investigated by means of optic microscope, X-ray diffractometer and electronic probe analyzer. The results show that HCFC is mainly composed of primary phase (Cr,Fe)7C3, eutectic phase (Cr,Fe)7C3-CrFe and graphite phase, which is independent of cooling rate. With the improvement of cooling rate, the grain size of primary phase decreases gradually, while its mass fraction shows an increasing trend. The growth of primary phase grain for water-cooled sample is perpendicular to the solidification interface, but that of primary phase grain for furnace-cooled and air-cooled samples has not fixed direction. Due to the non-equilibrium solidification in air-cooled and water-cooled conditions, the formation of peritectic phase (Cr,Fe)23C6 is restrained along with the precipitation of eutectic phase (Cr,Fe)23C6-CrFe. Flake graphite phase is discovered in primary phase and eutectic phase of furnace-cooled specimen as well as eutectic zone of air-cooled and water-cooled specimens. As the cooling rate increases, the mass ratio of Cr to Fe in (Cr,Fe)7C3 gradually declines, while that for (Cr,Fe)23C6, CrFe goes up, and the distribution of other impurity elements such as Si, Mn and Ti in main phases is hardly affected by cooling rate.关键词
高碳铬铁/冷却速率/金相组织/石墨析出Key words
high-carbon ferrochrome/cooling rate/metallographic structure/graphite precipitation分类
矿业与冶金引用本文复制引用
杨建平,陈津,郝赳赳,郭丽娜,林万明..冷却速率对高碳铬铁金相组织的影响[J].中南大学学报（自然科学版）,2016,47(7):2213-2220,8.基金项目
钢铁联合研究基金-国家自然科学基金委员会与上海宝山钢铁集团公司联合资助项目(51174252)(Project(51174252) supported by the Joint Fund of the National Natural Science Foundation of China and the Shanghai Baosteel Group Corporation) （51174252）
