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材料研究学报  2018, Vol. 32 Issue (2): 142-148    DOI: 10.11901/1005.3093.2017.625
  研究论文 本期目录 | 过刊浏览 |
Cr/Ni当量比对CAP1400核主泵泵壳用奥氏体不锈钢性能的影响
康秀红(), 胡小强, 郑雷刚, 夏立军
中国科学院金属研究所 沈阳材料科学国家(联合)实验室 沈阳 110016
Effect of Cr/Ni Equivalent Ratio on Microstructure and Properties of Austenitic Stainless Steel CAP1400 for Reactor Coolant Pump Casing
Xiuhong KANG(), Xiaoqiang HU, Leigang ZHENG, Lijun XIA
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
引用本文:

康秀红, 胡小强, 郑雷刚, 夏立军. Cr/Ni当量比对CAP1400核主泵泵壳用奥氏体不锈钢性能的影响[J]. 材料研究学报, 2018, 32(2): 142-148.
Xiuhong KANG, Xiaoqiang HU, Leigang ZHENG, Lijun XIA. Effect of Cr/Ni Equivalent Ratio on Microstructure and Properties of Austenitic Stainless Steel CAP1400 for Reactor Coolant Pump Casing[J]. Chinese Journal of Materials Research, 2018, 32(2): 142-148.

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摘要: 

基于热力学分析,设计了2种不同Cr/Ni当量比的CAP1400核主泵泵壳用奥氏体不锈钢,研究了Cr/Ni当量比和固溶处理温度对这类钢中铁素体的含量及其350℃拉伸性能的影响。结果表明,Cr/Ni当量比较大时,泵壳用奥氏体钢中铁素体含量较多,更为粗大;而且350℃时抗拉强度较高,能满足CAP1400核主泵泵壳的力学性能要求。在1100~1200℃不同温度固溶处理后,随着固溶处理温度的提高泵壳用奥氏体不锈钢中铁素体的含量略有提高,但是对350℃时的拉伸强度影响较小。
关键词 ： 金属材料,  奥氏体不锈钢,  Cr/Ni当量比,  固溶处理,  铁素体含量,  核主泵泵壳    
Abstract：

Austenitic stainless steels with different Cr / Ni equivalent ratio for CAP1400 reactor coolant pump casings were designed based on thermodynamics consideration. The effect of Cr/Ni equivalent ratio and solution treatment temperature on the ferrite volume fraction and tensile properties of the steel at 350℃ were investigated by microstructure observation and tensile tests. Results show that with the increase of Cr/Ni equivalent ratio the amount of ferrite-phase in austenitic stainless steel increases and the ferrite-phase is more bulky. The austenitic stainless steel with high Cr/Ni equivalent ratio has a higher tensile strength at 350℃, which can meet the requirements of mechanical properties for CAP1400 pump casing. After solution treatment at different temperatures in the range from 1100~1200℃, the content of ferrite-phase in the studied steel was slightly increased with the raising of solution treatment temperature, but it had little effect on the tensile properties at 350℃.
Key words： metallic materials    austenitic stainless steel    Cr/Ni equivalent ratio    solution treatment    ferrite contents    nuclear reactor coolant pump casing
收稿日期: 2017-10-19     
ZTFLH:  TG171  
基金资助:辽宁省科技创新重大专项(201410003)
作者简介:

作者简介 康秀红,女,1976年生,博士,副研究员
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https://www.cjmr.org/CN/10.11901/1005.3093.2017.625      或      https://www.cjmr.org/CN/Y2018/V32/I2/142

Elements C Mn Si S P Cr Ni Mo Fe
Specification ≤0.08 ≤1.50 ≤2.00 ≤0.005 ≤0.03 18.0~21.0 8.0~11.0 ≤0.50 Bal.
表1  CAP1400核主泵泵壳用奥氏体不锈钢的成分
Strength parameter Rm/MPa Rp0.2/MPa
Requirement ≥404 ≥144
表2  CAP1400核主泵泵壳用奥氏体不锈钢的350℃拉伸性能要求
图1  CAP1400-1和CAP1400-2铸态样品的热处理制度
Elements C Mn Si Ni Cr Mo S P N O Fe
CAP1400-1 0.063 1.16 1.49 11.25 19.72 0.52 0.0004 0.004 0.026 0.0009 Bal.
CAP1400-2 0.056 1.18 1.49 8.60 19.95 0.39 0.0007 0.005 0.028 0.0008 Bal.
表3  CAP1400核主泵泵壳奥氏体不锈钢实验铸锭化学成分(%, mass fraction)
图2  在平衡态下CAP1400奥氏体不锈钢的凝固规律
Elements C Mn Si Ni Cr Mo S P N O Fe Creq/Nieq
CAP1400-1 0.060 1.20 1.50 11.00 20.00 0.50 ≤0.0015 ≤0.01 0.03 ≤0.0015 Bal. 0.99
CAP1400-2 0.060 1.20 1.50 8.00 20.00 0.50 ≤0.0015 ≤0.01 0.03 ≤0.0015 Bal. 1.22
表4  CAP1400泵体奥氏体不锈钢合金设计化学成分(%,质量分数)
图3  在平衡态下CAP1400-1和CAP1400-2奥氏体不锈钢中平衡相质量分数与温度的关系
图4  CAP1400-1和CAP1400-2的铸态组织
Steel Creq/Nieq Calculated ferrite fraction/%,
volume fraction		 Measured ferrite fraction/%,
volume fraction
CAP1400-1 0.99 4.8 6.6±1.1
CAP1400-2 1.22 14.5 12.1±1.3
表5  CAP1400-1和CAP1400-2铸态组织中铁素体含量
图5  CAP1400-1合金在不同温度固溶处理后的光学组织形貌
图6  CAP1400-2合金在不同温度固溶处理后的光学组织形貌
图7  热处理制度对CAP1400-1和CAP1400-2合金中铁素体含量的影响
图8  CAP1400-1和CAP1400-2的350℃拉伸时的屈服强度和抗拉强度
图9  固溶温度对CAP1400-1和CAP1400-2合金350℃拉伸延伸率的影响
图10  在350℃固溶处理试样的拉伸断口微观形貌
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