<strong>650 ℃</strong>时效对<strong>9Cr-ODS</strong>钢显微组织和性能的影响

doi:10.11900/0412.1961.2019.00445

金属学报

2020, Vol. 56

Issue (8): 1075-1083 DOI: 10.11900/0412.1961.2019.00445

本期目录 | 过刊浏览

650 ℃时效对9Cr-ODS钢显微组织和性能的影响

彭艳艳, 余黎明(

), 刘永长, 马宗青, 刘晨曦, 李冲, 李会军

天津大学材料科学与工程学院天津市复合材料与功能化重点实验室天津 300072

Effect of Ageing Treatment at 650 ℃ on Microstructure and Properties of 9Cr-ODS Steel

PENG Yanyan, YU Liming(

), LIU Yongchang, MA Zongqing, LIU Chenxi, LI Chong, LI Huijun

Tianjin Key Lab of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

引用本文:

彭艳艳, 余黎明, 刘永长, 马宗青, 刘晨曦, 李冲, 李会军. 650 ℃时效对9Cr-ODS钢显微组织和性能的影响[J]. 金属学报, 2020, 56(8): 1075-1083.
Yanyan PENG, Liming YU, Yongchang LIU, Zongqing MA, Chenxi LIU, Chong LI, Huijun LI. Effect of Ageing Treatment at 650 ℃ on Microstructure and Properties of 9Cr-ODS Steel[J]. Acta Metall Sin, 2020, 56(8): 1075-1083.

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摘要:

采用粉末冶金工艺制备了9Cr-ODS钢，采用XRD、SEM、TEM、硬度测试等方法对9Cr-ODS钢在650 ℃下时效不同时间后的组织演变与热稳定性进行了研究。结果表明：原始烧结态组织主要由板条马氏体和Y₂O₃析出相组成；随着时效时间的增加，9Cr-ODS钢的板条马氏体逐渐粗化，位错减少，同时Cr₂₃C₆碳化物开始析出并长大。大尺寸Laves相在时效中逐渐析出并随时效时间延长而长大。尺寸较大的Y₂O₃粒子在时效中进一步增大，而尺寸稍小的Y₂O₃在时效中析出数量增多。显微硬度随时效时间的增加先下降然后逐渐趋于稳定。

关键词 ： 9Cr-ODS钢, 时效, 热稳定性

Abstract：

Oxide dispersion strengthened (ODS) steel has excellent high-temperature performance and corrosion resistance. It has broad application prospect and development space in the key field of high temperature structural materials for nuclear power. 9Cr-ODS steel has become one of the most promising candidate materials in advanced nuclear reactors because of its excellent high temperature mechanical properties and radiation resistance. In this work, 9Cr-ODS steel was designed and prepared by powder metallurgy process. The as-hot isostatically pressed (HIPed) microstructure of the steel was studied and analyzed, including matrix grain distribution characteristics, micron-scale large size precipitated phase, and nanoscale oxide particles. In addition, the high temperature microstructure thermal stability of 9Cr-ODS steel aged at 650 ℃ for different time was researched by means of XRD, SEM, TEM and hardness test, and the microstructure change of matrix and hardness properties were analyzed. Based on the contrast analysis of the matrix microstructure and hardness properties, the hardness change of the austenitic ODS steel at high temperature was obtained. The results showed that the original as-HIPed microstructure of 9Cr-ODS steel is mainly composed of martensite lath and large amount of Y₂O₃. During ageing process, the lath martensite of 9Cr-ODS steel gradually coarsens and the number of dislocations decreases with ageing time increasing, and the Cr₂₃C₆ carbides begin to precipitate along the grain boundary and grow up. At the same time, the Laves phases with large size begin to precipitate in ageing and then grow with the increase of ageing time. Meanwhile, ageing treatment makes Y₂O₃ phase with larger size further grow, while Y₂O₃ phase with smaller size precipitate increase. This phenomenon can probably be associated with the dissolution of the fine particles induced from the particle coarsening, generally called the Ostwald-Ripening mechanism. The change of microhardness during ageing was related to the size of lath martensite and the number and density of the second phase precipitation, especially Cr₂₃C₆. The hardness test results show that the microhardness first decreases and then tends to be stable with the increase of ageing time.

Key words： 9Cr-ODS steel ageing thermal stability

收稿日期: 2019-12-24

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目(51974199);国家自然科学基金项目(U1960204)

作者简介: 彭艳艳，女，1994年生，硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00445 或 https://www.ams.org.cn/CN/Y2020/V56/I8/1075

图1 9Cr-ODS钢在650 ℃不同时效时间的XRD谱

图2 9Cr-ODS钢在650 ℃不同时效时间下的TEM明场像

图3 9Cr-ODS钢在650 ℃不同时效时间下的马氏体板条尺寸统计图和平均尺寸图

图4 9Cr-ODS钢中氧化物在650 ℃不同时效时间的TEM明场像

图5 9Cr-ODS钢中氧化物的TEM像和EDS

图6 Y2O3与基体的SAED谱

图7 9Cr-ODS钢在650 ℃不同时效时间下的Y2O3尺寸统计图和平均尺寸图

图8 9Cr-ODS钢在650 ℃不同时效时间下的碳化物TEM明场像

图9 9Cr-ODS钢中碳化物的TEM像和EDS

图10 9Cr-ODS钢在650 ℃不同时效时间下的Laves相TEM明场像

图11 9Cr-ODS钢中Laves相的TEM像和EDS

图12 650 ℃时效时硬度随时效时间的变化

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