超临界水冷堆用候选奥氏体耐热不锈钢热时效组织研究

李俊; 李绍宏; 熊茹; 杨红梅; 李萌蘖

doi:10.13832/j.jnpe.2023.06.0148

超临界水冷堆用候选奥氏体耐热不锈钢热时效组织研究

doi: 10.13832/j.jnpe.2023.06.0148

李俊^1,,
李绍宏¹,
熊茹^2, ,,
杨红梅¹,
李萌蘖¹

1.
昆明理工大学材料科学与工程学院，昆明，650093
2.
中国核动力研究设计院反应堆燃料及材料重点实验室，成都，610213

基金项目: 国家重点研发计划（2018YFE0116200）

详细信息

作者简介:
李　俊（1979—），男，副教授，现主要从事金属材料强韧化研究，E-mail: mes_lijun@kust.edu.cn

通讯作者:
熊　茹，E-mail: littlexiongru@126.com

中图分类号: TL334
计量
- 文章访问数: 167
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- PDF下载量: 26
- 被引次数: 0
出版历程
- 收稿日期: 2022-11-20
- 修回日期: 2023-04-27
- 刊出日期: 2023-12-15

Study on the Thermal Aged Microstructure of Candidate Austenitic Heat-resistant Stainless Steel for Supercritical Water-cooled Reactor

1.
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
2.
Key Laboratory of Nuclear Reactor System Design Technology, Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: 为了研究热时效过程中超临界水冷堆（SCWR）用候选包壳材料含铝奥氏体耐热钢（AFA）热时效组织和冲击性能的变化，对铝含量为2.5%的AFA钢在650℃进行了500~3000 h热时效处理。利用场发射扫描电镜对析出相及冲击断口进行观察，利用透射电镜对热时效试验钢中析出相的类型和结构进行研究。结果表明：试验钢的冲击韧性随时效时间延长而逐渐降低，试验钢断裂由韧窝断裂逐渐向韧窝断裂和解理断裂的混合断裂方式过渡。热时效过程中Laves相在晶界上析出以及γ'-Ni₃Al相大量析出并粗化是AFA钢冲击韧性随时效时间延长而降低的主要原因。
- 超临界水冷堆（SCWR） /
- 燃料包壳 /
- AFA钢 /
- 冲击性能
Abstract: In order to study the change of thermal aged microstructure and impact properties of alumina-forming austenitic stainless (AFA) steel, a candidate cladding material for Supercritical water-cooled reactor（SCWR）, the AFA steel with 2.5% aluminum content was subjected to thermal aging treatment at 650℃ for 500~3000 h. The precipitated phases and the impact fracture were observed by field emission scanning electron microscopy. The types and crystal structures of the precipitated phases were studied by transmission electron microscopy. The results show that the impact toughness of the test steel decreases gradually with the extension of aging time, and the fracture of the test steel gradually transits from dimple fracture to mixed fracture mode of dimple fracture and cleavage fracture. The precipitation of Laves phase at grain boundaries and the precipitation and coarsening of γ'-Ni₃Al phase during thermal aging are the main reasons for the decrease of impact toughness of AFA steel with the extension of aging time.
- SCWR /
- Fuel cladding /
- AFA steel /
- Impact properties

HTML全文

图 1 试验钢固溶态样品的金相组织和FE-SEM组织

Figure 1. Metallographic and FE-SEM Images of Solid Solution Sample

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图 2 不同时间热时效处理后AFA钢的冲击功

Figure 2. Impact Energy of AFA Steel after Different Thermal Aging Time

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图 3 固溶态试样冲击断口形貌

Figure 3. Impact Fracture Morphology of Solid Solution Samples　　　　　　

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图 4 试验钢在650℃热时效不同时间的冲击断口形貌

Figure 4. Impact Fracture Morphology of Test Steel Aged at 650℃ for Different Time

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图 5 试验钢650℃热时效不同时间的背散射电子像（内插图为二次电子像）

Figure 5. Backscattered Electron Images of Test Steel Aged at 650℃ for Different Time (the inserted image is secondary electron image)

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图 6 试验钢 650℃热时效 3000 h 样品的 TEM 图

Figure 6. TEM Image of Test Steel Aged at 650℃ for 3000 h

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图 7 试验钢在 650℃热时效不同时间晶界上析出相的平均尺寸

Figure 7. Average Size of Precipitated Phases at Grain Boundary of Test Steel after Thermal Aging at 650℃

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表 1 AFA钢化学成分

Table 1. Chemical Composition of AFA Steel

元素	C	Si	Mn	P	S	Ni	Cr	Cu	Mo	V	Ti	Al	Nb	B	Fe
质量分数/%	0.024	0.081	0.051	0.0085	0.0066	23.46	13.980	0.007	1.981	0.014	0.013	2.507	0.470	0.005	57.40

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