摘要
观察分析了服役前后Fe-Cr-Ni耐热钢乙烯裂解炉管横截面组织。由管外壁向内,树枝晶的垂直管外壁沿径向生长的特征逐渐减弱,直至消失。服役前组织为含过饱和碳的奥氏体和沿晶界分布的碳化物。炉管服役过程的时效与渗碳导致大量碳化物的析出,其数量、大小与形态取决于服役温度和时间。析出碳化物影响炉管的性能。
The microstructure of ethylene cracking tubes before and after service was examined and analyzed.The directional growth feature of cellular-dendritic crystals growing along the direction perpendicular to the tube wall weakened gradually from the external side to the inside.The microstructure before was mainly austenite over-saturated with carbon and carbides distributed along grain boundaries.Aging and carburization during the service produced precipitation of carbides,the amount,size and forms of which depended on the service time and working temperature.The mechanical properties of the tube were influenced by the precipitation of carbides.
出处
《江苏工业学院学报》
2005年第1期5-8,共4页
Journal of Jiangsu Polytechnic University
基金
江苏省科技厅应用基础研究基金资助(BJ2000007)
教育部留学回国人员科研启动基金资助
关键词
组织
乙烯裂解炉管
渗碳
耐热钢
microstructure
ethylene cracking tube
carburization
heat resistant steel
