690合金中三晶交界及晶界类型对碳化物析出形貌的影响

doi:10.11900/0412.1961.2017.00141

金属学报

2018, Vol. 54

Issue (3): 404-410 DOI: 10.11900/0412.1961.2017.00141

本期目录 | 过刊浏览

690合金中三晶交界及晶界类型对碳化物析出形貌的影响

刘锡荣, 张凯, 夏爽, 刘文庆, 李慧(

)

上海大学微结构重点实验室上海 200444

Effects of Triple Junction and Grain Boundary Characters on the Morphology of Carbide Precipitation in Alloy 690

Xirong LIU, Kai ZHANG, Shuang XIA, Wenqing LIU, Hui LI(

)

Key Laboratory for Microstructures, Shanghai University, Shanghai 200444,China;

引用本文:

刘锡荣, 张凯, 夏爽, 刘文庆, 李慧. 690合金中三晶交界及晶界类型对碳化物析出形貌的影响[J]. 金属学报, 2018, 54(3): 404-410.
Xirong LIU, Kai ZHANG, Shuang XIA, Wenqing LIU, Hui LI. Effects of Triple Junction and Grain Boundary Characters on the Morphology of Carbide Precipitation in Alloy 690[J]. Acta Metall Sin, 2018, 54(3): 404-410.

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摘要:

利用SEM和EBSD技术研究了镍基690合金在715 ℃时效15 h后不同类型的三晶交界附近3个晶界上碳化物的析出形貌。结果表明：对于不同类型三晶交界处,Σ3_c晶界上析出的碳化物的形貌存在明显的差异,碳化物按照Σ3-Σ3-Σ9、Σ3-Σ9-Σ27、Σ3-Σ27-R、Σ3-R-R三晶交界顺序逐渐增多增大。Σ3_i和Σ9晶界上析出的碳化物的形貌在不同类型的三晶交界附近基本相似。Σ27晶界上碳化物的析出形貌在三晶交界处与晶界内部存在一定差异,三晶交界处析出的碳化物相对于晶界内部离散且大。当2条随机晶界与Σ3或Σ9晶界相连时,其中一条随机晶界上析出的碳化物比另一条上的小。

关键词 ：碳化物, 晶界类型, 三晶交界, 晶界工程, 690合金

Abstract：

The nickel-based Inconel Alloy 690 (Ni-30Cr-10Fe, mass fraction, %) was developed as a replacement material for Inconel Alloy 600 in the steam generator tube of pressurized water reactors nuclear power plants. Intergranular corrosion and intergranular stress corrosion cracking were the main failure reasons for steam generator tubes, which were related to the precipitation of grain boundary carbides. Hence, the precipitation of carbide at the grain boundaries and triple junctions with different characters is worthy to be studied. The morphology of carbide precipitated on grain boundaries at triple junctions with various characters in grain boundary engineering (GBE) treated Alloy 690 aged at 715 ℃ for 15 h were investigated by SEM and EBSD. The results show that, there are obvious differences in the morphology of carbides precipitated on the Σ3_c grain boundary near different types of triple junction. The size of carbide precipitated at Σ3_c grain boundary increased by the order of Σ3-Σ3-Σ9、Σ3-Σ9-Σ27、Σ3-Σ27-R、Σ3-R-R triple junctions. But the morphology of carbides precipitated at the Σ3_i and Σ9 grain boundaries was independent of the nearby triple junction characters. The precipitation morphology of carbides precipitated on the Σ27 grain boundary near the triple junction is different from that precipitated on the internal grain boundary, for example, the carbides precipitated near triple junction was more discrete and bigger than that precipitated on internal grain boundary. When the triple junction contain two random grain boundaries and one Σ3 grain boundary or Σ9 grain boundary, the size of carbide precipitated on one of random grain boundary is smaller than that of precipitated on the other one.

Key words： carbide grain boundary character triple junction grain boundary engineering Alloy 690

收稿日期: 2017-04-20

基金资助:资助项目国家重点研发计划项目 No.2016YFB0700401和国家自然科学基金项目 No.51301103

作者简介:

作者简介刘锡荣,男,1992年生,硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00141 或 https://www.ams.org.cn/CN/Y2018/V54/I3/404

图1 690合金在1100 ℃下固溶处理15 min,固溶处理后将样品冷轧5%、再经1100 ℃再结晶退火5 min (GBE),GBE处理后在715 ℃时效15 h 样品的取向成像显微 (OIM)图

表1 690合金在不同处理条件下的晶界特征分布统计(Palumbo-Aust标准[16],长度百分比)和平均晶粒尺寸

图2 715 ℃时效15 h后Σ3-Σ3-Σ9三晶交界附近3个晶界上碳化物的析出形貌

图3 715 ℃时效15 h后Σ3-Σ9-Σ27和Σ3-Σ27-R 三晶交界处3个晶界上碳化物的析出形貌

图4 715 ℃时效15 h后Σ3 (Σ9)-R-R三晶交界处3个晶界上碳化物的析出形貌

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