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张建龙,崔英浩,薛河.安全端焊接接头镍基合金600SCC裂纹扩展行为研究[J].稀有金属材料与工程(英文),2020,49(5):1496~1502.[Zhang Jianlong,Cui Yinghao and Xue He.Research on SCC Crack Growth Behavior of Nickel-based Alloy 600 in Safe-end Welded Joints[J].Rare Metal Materials and Engineering,2020,49(5):1496~1502.]
Research on SCC Crack Growth Behavior of Nickel-based Alloy 600 in Safe-end Welded Joints
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Received:October 18, 2019  Revised:May 11, 2020
Key words: SCC  nickel-based alloy  macro structural parameters  crack tip plastic zone  crack growth rate (CGR)
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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Zhang Jianlong,Cui Yinghao and Xue He  
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      Nickel-based alloys are commonly used as welding part for the primary circuit safe-end welded joints of pressurized water reactors. Due to the harsh service environment and the uneven mechanical properties of the welded joints, the nickel-based alloys are prone to produce stress corrosion cracking, which has a great impact on the safe operation of nuclear power. To understand the variation of the material macrostructural parameters (including the plastic properties of the material and the stress intensity factor K) on the SCC crack growth rate, the SCC crack propagation finite element model of nickel-base alloy 600 under different macrostructure parameters was established, and the effects of different plasticity and K on the plastic zone and tensile plastic strain around the crack tip are analyzed. Results show that the plastic zone size and tensile strain around crack tip are affected by K, yield strength and hardening exponent, among which the K at crack tip has a greater influence, and it is inversely proportional to yield strength, while the K is directly proportional to hardening exponent. The results of SCC growth rate calculated under different K were compared with the experimental results under high temperature water environment, and the range of characteristic distance r0 of nickel-based alloy 600 was obtained. The research results can provide a scientific basis for SCC rate prediction under high temperature water environment of nickel-based alloy 600 for nuclear power.