【作者】 高雪云； 田景玉； 刘杰； 刘俊友；

【Author】 Gao Xueyun~1,Tian Jingyu~1,Liu Jie~2,Liu Junyou~1 1.School of Materials Science and Enigneerging;Beijing University of Science and Technology Beijing, Beijing 100083,China; 2.Beijing BKDR Metallurgy Engineering & Technology Co.,Ltd.,Beijing 100083,China

【机构】 北京科技大学材料科学与工程学院； 北京北科德瑞冶金工程技术有限公司；

【摘要】 利用光学显微镜(OM)观察了高铬铸铁材质的篦条的显微组织,采用X射线衍射方法对试样进行物相鉴定,同时测定了不同服役时期试样的冲击韧性。在此基础上,分析了显微组织演变对篦条冲击韧性的影响。结果表明,由于原始铸态组织处于热力学不稳定状态,在高温条件下不断析出点状二次碳化物,致使合金的冲击韧性持续下降。更多还原

【Abstract】 Microstructure of high-chromium cast iron grate bars was observed by means of optical microscopy(OM),and phase identification was carried out by using X-ray diffraction.Moreover,the impact toughness of the specimen at different times in service was measured.On this basis,the effect of microstructure evolution of high chromium cast iron grate bars for Bayan Obo ore sintering on the impact toughness.The results show that the continuous secondary carbide precipitation dot precipitate continuously during high temperatures,since the thermodynamic instability of the original cast structure, which result in the deteriorating of the impact toughness.更多还原