700℃超超临界机组用617B镍基合金的组织结构和析出相  

Microstructure and Precipitates of Alloy 617B Used for 700℃ Advanced Ulta-supercritical Power Units

作　　者：郭岩[1] 王彩侠[1] 李太江[1] 侯淑芳[1] 王博涵[1] 

机构地区：[1]西安热工研究院有限公司,西安710032

出　　处：《材料研究学报》2016年第11期841-847,共7页Chinese Journal of Materials Research

基　　金：西安热工研究院有限公司研究开发基金TN-15-TYK05资助项目~~

摘　　要：使用扫描电子显微镜(SEM)和透射电子显微镜(TEM)对比分析了617B镍基合金在750℃持久试样和时效态试样的组织结构和析出相。结果表明:在蠕变和时效过程中在晶内和晶界都析出复杂面心立方结构的M23C6,晶内析出有序立方结构γ′相,前者为多边形或条形,后者为粒状;随着试验时间的延长析出物的颗粒尺寸出现长大的趋势;应力对γ′相的生长影响不明显,但是对晶界碳化物有明显的影响;在长时间应力条件下,M23C6碳化物聚集长大。The microstructure and precipitates of the creep-ruptured and aged alloy 617B at 750℃ were characterized by means of scanning electron microscopy （SEM） and transmission electron microscopy （TEM）.The polygonal （or strip-type） M23C6 particles with a complex face-centered cubic （fcc） structure locate along grain boundaries and inside grains, and granular y＇ phase particles with an ordered fcc- structure inside grains were observed during creep and aging. The precipitates grown up with test time. The comparative observation of the aged and creep-ruptured alloy samples revealed that the applied stress did not affect the growth of y＇ phase obviously, but affect the precipitation of carbides at grain boundaries greatly. The stress leads to the sharp growth and agglomation of M23C6 particles after a long time creep test.

关 键 词：金属材料 镍基合金617B 蠕变 时效 析出 应力 

分 类 号：O631.2[理学—高分子化学]