新型铁镍基合金的高温时效组织演化规律研究  

Research on Evolution Laws of High Temperature Aging Microstructure in Novel Fe-Ni Based Superalloy

作　　者：李生志 孙林根 霍鑫 丁丽锋 刘霞 沈红卫 程俊 杨振刚 刘瞿[2] LI Shengzhi;SUN Lingen;HUO Xin;DING Lifeng;LIU Xia;SHEN Hongwei;CHENG Jun;YANG Zhengang;LIU Qu

机构地区：[1]上海电气电站设备有限公司上海汽轮机厂,上海200240 [2]清华大学机械工程系,北京100084

出　　处：《大型铸锻件》2024年第6期65-68,93,共5页Heavy Casting and Forging

基　　金：国家重点研发计划项目(2023YFB4102300650℃及以上高参数高效燃煤发电技术及示范)。

摘　　要：针对650℃超超临界火电机组使用的新型铁镍基高温合金材料,通过微观组织观察,开展了高温时效过程中的组织演化规律研究。结果表明,在650℃时效时,合金中晶界和晶内无明显析出相析出。随着时效温度提高和时间延长,晶界以颗粒状的TiC和M_(23)C_(6)碳化物析出相为主,呈链状分布;晶内以球状γ′强化相为主,尺寸由几纳米增加到几十纳米。此外,在800℃及850℃时效时,合金中部分区域出现晶界迁移现象,形成了析出相贫化与不连续粗化区。The evolution laws of microstructure in a novel Fe-Ni based superalloy utilized in ultra-supercritical thermal power generating units during high temperature aging treatment were investigated through methods such as microstructure observation.The results show that aging at 650℃,there is no obvious precipitate in the grain boundary and in the crystal.With the increase of aging temperature and time,granular TiC and M 23 C 6 carbide precipitates are mainly distributed in chain pattern at grain boundaries.The sphericalγ'reinforced phase is mainly distributed in the crystal,and the size increases from a few nanometers to tens of nanometers.Furthermore,some grain boundaries migrated at the aging temperature of 800℃and 850℃,forming precipitation dilution zones and discontinuous coarsening zones.

关 键 词：铁镍基合金 高温时效 组织演化 晶界迁移 

分 类 号：TG17[金属学及工艺—金属表面处理]