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,2020,49(5):1496~1502.[Zhang Jianlong,Cui Yinghao,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.]
安全端焊接接头镍基合金600SCC裂纹扩展行为研究
投稿时间:2019-10-18  修订日期:2020-05-11
中文关键词:  应力腐蚀开裂  镍基合金  宏观结构参量  裂尖塑性区  裂纹扩展速率
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      镍基合金作为压水堆一回路安全端焊接接头焊缝的常用材料,由于严苛的服役环境以及焊缝处材料力学性能的不均匀使得镍基合金极易发生应力腐蚀开裂现象,对核电安全运行造成很大影响。为了解材料宏观结构参量变化(包括材料塑性性能以及应力强度因子K)对SCC裂纹扩展速率的变化,本文通过建立镍基合金600不同宏观结构参量下的SCC裂纹扩展有限元模型,分析了镍基合金600不同塑性以及载荷参数变化对裂尖塑性区和拉伸塑性应变的影响,结果表明塑性区尺寸及裂尖拉伸应变受到裂尖应力强度因子、屈服强度及硬化指数的影响,其中裂尖应力强度因子的影响较大,同时与屈服强度成反比,应力强度因子和硬化指数成正比;通过比较不同应力强度因子下计算所得SCC扩展速率结果和高温水环境下SCC扩展速率实验,获得了符合镍基合金600的特征距离r0的取值范围;研究结果能为核电镍基合金600的高温水环境下SCC速率预测提供一定的科学依据。
Research on SCC Crack Growth Behavior of Nickel-based Alloy 600 in Safe-end Welded Joints
英文关键词:SCC  nickel-based alloy  macro structural parameters  crack tip plastic zone  crack growth rate (CGR)
英文摘要:
      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.
作者单位E-mail
张建龙 西安科技大学机械工程学院 jlzhang916@hotmail.com 
崔英浩 中原工学院  
薛河 西安科技大学机械工程学院 xuehe1961@163.com 
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