高温时效对一种铁镍基合金组织稳定性的影响  

Effect of high temperature aging on microstructure stability of Fe-Ni based alloy

作　　者：杨权 冯起[2] 徐航 赵中赫 郝维勋 李庆春 英晓宇[2] YANG Quan;FENG Qi;XU Hang;ZHAO Zhonghe;HAO Weixun;LI Qingchun;YING Xiaoyu(State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers,Harbin 150046,China;Harbin Boiler Co.,Ltd.,Harbin 150046,China)

机构地区：[1]高效清洁燃煤电站锅炉国家重点实验室,哈尔滨150046 [2]哈尔滨锅炉厂有限责任公司,哈尔滨150046

出　　处：《黑龙江电力》2021年第5期440-443,共4页Heilongjiang Electric Power

摘　　要：研究交货状态铁镍基合金Ni47Cr23Fe23W7在650℃高温时效过程中的显微组织稳定性,采用约翰逊-迈尔(JMAK)方程进行计算。在650℃下,随着时效时间的延长,达到5000 h以上后,逐渐在晶界和晶粒内部出现少量析出相,析出相呈颗粒状和短棒状,缓慢长大。结果表明,Ni47Cr23Fe23W7在650℃下,组织预计开始发生粗化的时间约为16.7万小时,具有优异组织稳定性,Ni47Cr23Fe23W7合金可以作为650℃超超临界机组锅炉集箱和管道的候选材料。The microstructure stability of delivered Fe-Ni base alloy Ni47Cr23Fe23W7 during high temperature aging at 650℃was studied and calculated by Johnson-Mayer(JMAK)equation.At 650℃,with the extension of aging time,after more than 5000 h,a small amount of precipitates gradually appear at the grain boundary and inside the grain,and the precipitates grow slowly in granular and short rod shape.The results show that Ni47Cr23Fe23W7 is expected to start coarsening at 650℃for 167000 hours,which has excellent structural stability.Ni47Cr23Fe23W7 alloy can be used as a candidate material for boiler header and pipeline of 650℃ultra supercritical unit.

关 键 词：铁镍基合金 高温时效 组织稳定性 超超临界机组 

分 类 号：TF734.36[冶金工程—钢铁冶金]