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研究了核电用镍基Inconel 600合金在350℃和450~650 MPa下的蠕变过程,分析了蠕变应变随应力、时间的变化规律。利用幂定律和对数定律对试验数据进行拟合,建立了Inconel 600合金的蠕变本构方程。结果表明:在350℃和450~650 MPa应力条件下,Inconel 600合金初期蠕变速率很大,随着时间延长,合金的加工硬化程度增加,蠕变速率减小;幂定律和对数定律都能较好的拟合Inconel 600合金的蠕变变形量随时间的变化趋势。与幂定律相比,对数定律拟合的蠕变曲线与试验数据更加接近。Inconel600合金的蠕变本构方程为:ε=1.234×10~(-14)σ~(3.969)t~(0.3199)或ε=1.009×10~(-11)σ~(3.458)ln(1+t/64.76)。
The creep process of nickel-based Inconel 600 alloy for nuclear power at 350 ℃ and 450-650 MPa was studied. The variation of creep strain with stress and time was analyzed. The creep constitutive equation of Inconel 600 alloy was established by fitting the experimental data with power law and logarithmic law. The results show that at 350 ℃ and 450-650 MPa, the initial creep rate of Inconel 600 alloy is very high. With the extension of time, the degree of work hardening increases and the creep rate decreases. Both the power law and the logarithmic law Can better fit Inconel 600 creep deformation of the alloy with time trend. Compared with the power law, the law of logarithm of the fitted creep curve is closer to the experimental data. The creep constitutive equation of Inconel600 alloy is: ε = 1.234 × 10 ~ (-14) σ ~ (3.969) t ~ (0.3199) or ε = 1.009 × 10 ~ (-11) σ ~ (3.458) ln t / 64.76).