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Chinese Journal of Materials Research  2018, Vol. 32 Issue (2): 142-148    DOI: 10.11901/1005.3093.2017.625
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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
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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. Chinese Journal of Materials Research, 2018, 32(2): 142-148.

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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     
Received:  19 October 2017     
ZTFLH:  TG171  
Fund: Supported by Liaoning Science and Technology Innovation Major Project (No. 201410003)
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Articles by authors
Xiuhong KANG
Xiaoqiang HU
Leigang ZHENG
Lijun XIA

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.625     OR     https://www.cjmr.org/EN/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.
Table 1  Composition range of CAP1400 austenitic stainless steel (%, mass fraction)
Strength parameter Rm/MPa Rp0.2/MPa
Requirement ≥404 ≥144
Table 2  Tensile properties of CAP1400 austenitic stainless steel at 350℃
Fig.1  Heat treatment process for as cast samples of CAP1400-1 and CAP1400-2 steels
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.
Table 3  Chemical compositions of CAP1400 austenite stainless steel (%, mass fraction)
Fig.2  Solidification characteristics of CAP1400 austenite stainless steel at thermo dynamic equilibrium state (1- liquid, 2-liquid+BCC, 3-liquid+BCC+FCC)
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
Table 4  Designed chemical compositions of CAP1400 austenite stainless steel (%, mass fraction)
Fig.3  Mass fraction of phases as a function of temperature in CAP1400-1 (a) and CAP1400-2 (b)steels at thermodynamic equilibrium state (1-liquid, 2-δ phase, 3-γ phase,4-σ phase, 5-M23C6)
Fig.4  Optical micrographs of CAP1400-1 (a) and CAP1400-2 (b) austenite stainless steels
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
Table 5  Volume fraction of δ ferrite phases in CAP1400-1 and CAP1400-2 austenite stainless steels
Fig.5  Microstructure of CAP1400-1 alloy after solid solution treatment (a) 1110℃, (b) 1130℃, (c) 1160℃
Fig.6  The microstructure of CAP1400-2 alloy after solid solution treatment (a) 1110℃, (b) 1130℃, (c) 1160℃
Fig.7  Effect of heat treatment on ferrite content in CAP1400-1 and CAP1400-2 alloys
Fig.8  Yield strength (a) and tensile strength (b) of CAP1400-1 and CAP1400-2 at 350℃
Fig.9  Effect of solid solution temperature on the elongation of CAP1400-1 and CAP1400-2 steels at 350℃
Fig.10  Microstructure of tensile fracture at 350℃after solution treated at 1100℃ (a), 1130℃ (b), and 1160℃(c) for CAP1400-1 steeland solution treated at 1100℃ (d), 1130℃ (e), 1160℃ (f) for CAP1400-2 steel
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