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金属学报  2020, Vol. 56 Issue (5): 673-682    DOI: 10.11900/0412.1961.2019.00267
  本期目录 | 过刊浏览 |
冷变形和固溶温度对HR3C钢中σ相析出行为的影响
曹铁山1,2, 赵津艺1, 程从前1, 孟宪明3, 赵杰1()
1.大连理工大学材料科学与工程学院 大连 116024
2.大连理工大学工业装备结构分析国家重点实验室 大连 116024
3.中国汽车技术研究中心 天津 300300
Effect of Cold Deformation and Solid Solution Temperature on σ-phase Precipitation Behavior in HR3C Heat Resistant Steel
CAO Tieshan1,2, ZHAO Jinyi1, CHENG Congqian1, MENG Xianming3, ZHAO Jie1()
1.School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2.State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
3.China Automotive Technology & Research Center, Tianjin 300300, China
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摘要: 

结合HR3C钢制备工艺,综合研究冷变形和固溶处理工艺对其在时效过程中σ相的析出动力学和相关力学性能的影响。结果表明:冷变形和固溶温度均对该钢中σ相的析出有着较大的影响,变形量的增加会促进σ相的时效析出,升高固溶处理温度有助于抑制HR3C钢中σ相的析出行为,但却在一定程度上增大晶粒尺寸。σ相析出量随时间延长先缓慢增加,后快速析出,最后达到稳态值约5.7% (体积分数)。变形量的增加使HR3C钢时效过程中冲击韧性显著降低,而固溶温度的升高虽然增加了固溶态试样的冲击韧性但降低了时效过程中的冲击韧性。

关键词 HR3C钢σ冷变形固溶处理    
Abstract

HR3C steel, widely applied in ultra-supercritical power plant, suffers an intergranular embrittlement problem during long-term high-temperature ageing or service, which will be enhanced by the precipitation of σ phase. Research has showed that the precipitation behaviors of σ phase are different significantly as the difference of manufacturers, which relates to the preparation process of cold-deformation & solid-solution treatment. In this work, the effects of cold deformation and solution treatment on the precipitation kinetics of σ phase and related mechanical properties for HR3C steel during the ageing process were studied. The results show that cold-deformation and solid solution temperature both have a significant influence on the precipitation of σ phase in the steel. The increase of cold-deformation will promote the precipitation of σ phase, and rising solution temperature helps to inhibit the growth of σ phase but increase the grain size. The precipitation kinetics study of σ phase in HR3C steel with different pre-treatment shows that σ phase growths slowly at first, and then gets into a rapid precipitation period, and finally reaches a steady-state with a value of about 5.7% (volume fraction). The impact toughness analysis shows that the increase of cold-deformation would lower down the impact toughness of HR3C steel during the ageing procedure, while the rise of the solid-solution temperature increases the impact toughness before ageing and reduces it during ageing.

Key wordsHR3C steel    σ phase    cold-deformation    solid solution treatment
收稿日期: 2019-08-15     
ZTFLH:  TG142.1  
基金资助:国家自然科学基金项目(U1610256);国家高技术研究发展计划项目(2015AA034402);大连理工大学基本科研业务费项目(No.DUT19RC(4)010)
通讯作者: 赵杰     E-mail: jiezhao@dlut.edu.cn
Corresponding author: ZHAO Jie     E-mail: jiezhao@dlut.edu.cn
作者简介: 曹铁山,男,1985年生,博士

引用本文:

曹铁山, 赵津艺, 程从前, 孟宪明, 赵杰. 冷变形和固溶温度对HR3C钢中σ相析出行为的影响[J]. 金属学报, 2020, 56(5): 673-682.
Tieshan CAO, Jinyi ZHAO, Congqian CHENG, Xianming MENG, Jie ZHAO. Effect of Cold Deformation and Solid Solution Temperature on σ-phase Precipitation Behavior in HR3C Heat Resistant Steel. Acta Metall Sin, 2020, 56(5): 673-682.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00267      或      https://www.ams.org.cn/CN/Y2020/V56/I5/673

图1  不同状态下的HR3C试样显微组织的OM像
图2  冷变形8%的HR3C钢在不同温度固溶处理后的显微组织的OM像
图3  不同冷变形+1093 ℃、20 min固溶处理HR3C钢在750 ℃时效不同时间后显微组织的OM像
图4  冷变形8%的HR3C钢经不同固溶温度处理后750 ℃长时间时效显微组织的OM像
图5  8%冷变形+1093 ℃、20 min固溶+750 ℃、2000 h时效HR3C钢的SEM像及点1中第二相的EDS分析
图6  不同冷变形HR3C钢经1093 ℃、20 min固溶后在750 ℃时效过程中的显色实验结果
图7  不同冷变形的HR3C钢在750 ℃时效时σ相体积分数随时间的变化关系
图8  不同处理状态的HR3C钢的lnln11-y-lnt关系及σ相析出的Avrami曲线
Deformation stateSolution temperatureAgeing temperaturebn
As received10937509.654×10-71.787
50%10937003.860×10-82.598
50%10937506.808×10-72.313
8%10937002.024×10-215.816
8%10937501.129×10-92.600
8%11437501.557×10-195.369
表1  由lnln11-y-lnt线性关系得到的Avrami方程中参数b和n
图9  700和750 ℃时效条件下HR3C钢中σ相析出的TTT曲线
图10  冷变形和固溶温度对HR3C钢在700 ℃时效过程中的Charpy冲击吸收功的影响
图11  HR3C钢经8%冷变形+1093 ℃固溶处理后在700 ℃时效不同时间样品的微观断口形貌
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