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通过高温拉伸试验研究Hastelloy C-276合金在不同温度和初始应力下的应力松弛行为。实验得到了一系列应力松弛曲线,应用二次延迟函数对实验测得的应力松弛曲线进行拟合,拟合出的曲线与实验应力松弛曲线符合得较好。从实验测得的应力松弛曲线可以推导出不同温度下材料的蠕变应变速率与应力之间的关系,此外,还探讨了温度对Hastelloy C-276合金应力松弛的影响,为转子屏蔽套真空热胀形过程的有限元模拟工作奠定了理论基础,并为其提供了有价值的数据。
The stress relaxation behavior of Hastelloy C-276 alloy at different temperatures and initial stresses was investigated by high temperature tensile test. A series of stress relaxation curves were obtained. The quadratic delay function was used to fit the experimentally measured stress relaxation curves. The fitted curves were in good agreement with the experimental stress relaxation curves. From the measured stress relaxation curves, the relationship between the creep strain rate and the stress at different temperatures can be deduced. In addition, the effect of temperature on the stress relaxation of the Hastelloy C-276 alloy is also discussed. The bulging process of finite element simulation work laid the theoretical foundation, and provide valuable data.