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力学与化学相互作用引起的力学化学效应会加速核电站中镍基合金的应力腐蚀开裂行为。焊接接头材料力学性能的不均匀性,将间接影响材料的力学化学效应。采用标准紧凑拉伸试样和有限元方法,研究得到了高温水环境中600合金屈服强度和硬化指数对裂纹尖端表面力学化学效应的影响,分析了弹性和塑性变形对裂纹尖端力学化学效应的作用。结果表明,600合金裂尖表面的力学化学效应受到屈服强度变化的影响,但硬化指数对裂尖表面力学化学效应的影响不明显。
The mechanical and chemical effects caused by the interaction between mechanics and chemistry accelerate the stress corrosion cracking behavior of nickel-base alloys in nuclear power plants. The non-uniformity of the mechanical properties of the welded joint material will indirectly affect the mechanical and chemical effects of the material. The effect of yield strength and hardening index of 600 alloy on the mechano-chemical effect at the crack tip is investigated by using standard tensile test and finite element method. The effect of elastic and plastic deformation on the mechano-chemical effect at the crack tip is analyzed. . The results show that the mechanical and chemical effects of 600 alloy crack tip surface are affected by the yield strength changes, but the hardening index has no obvious effect on the mechanical and chemical effects of the crack tip surface.