700℃超超临界机组用617B镍基合金的组织结构和析出相*

doi:10.11901/1005.3093.2015.478

材料研究学报

2016, Vol. 30

Issue (11): 841-847 DOI: 10.11901/1005.3093.2015.478

论文

本期目录 | 过刊浏览

700℃超超临界机组用617B镍基合金的组织结构和析出相*

郭岩(

),王彩侠,李太江,侯淑芳,王博涵

西安热工研究院有限公司西安 710032

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

Yan GUO(

),Caixia WANG,Taijiang LI,Shufang HOU,Bohan WANG

Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710032, China

引用本文:

郭岩, 王彩侠, 李太江, 侯淑芳, 王博涵. 700℃超超临界机组用617B镍基合金的组织结构和析出相*[J]. 材料研究学报, 2016, 30(11): 841-847.
Yan GUO, Caixia WANG, Taijiang LI, Shufang HOU, Bohan WANG. Microstructure and Precipitates of Alloy 617B Used for 700℃ Advanced Ulta-supercritical Power Units[J]. Chinese Journal of Materials Research, 2016, 30(11): 841-847.

全文: PDF(7908 KB) HTML

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。

关键词 ：金属材料, 镍基合金617B, 蠕变, 时效, 析出, 应力

Abstract：

The microstructure and precipitates of the creep-ruptured and aged alloy 617B at 750^oC 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 γ ′ 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 γ ′ 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.

Key words： metallic materials alloy 617B creep aging precipitate stress

收稿日期: 2015-10-20

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

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表1 Alloy 617 B的化学成分

图1 持久断裂试样的断口形貌

图2 二次裂纹及析出物的扫描电镜形貌

图3 750℃/170 MPa/591 h持久断裂试样的TEM像和电子衍射花样

图4 750℃/300 h时效态的TEM像及电子衍射花样

图5 750℃/150 MPa/1237 h持久断裂试样的TEM像和电子衍射花样

图6 750℃/1000 h时效态的TEM像和电子衍射花样

图7 750℃/120 MPa/4764 h持久断裂试样的TEM像和电子衍射花样

图8 750℃/5000 h时效态的TEM像和电子衍射花样

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