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首页> 外文期刊>Journal of Materials Engineering and Performance >High-Temperature Mechanical Behavior of Cold-Worked Stress-Relieved Zr-2.5Nb
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High-Temperature Mechanical Behavior of Cold-Worked Stress-Relieved Zr-2.5Nb

机译：冷作应力消除Zr-2.5Nb的高温力学行为

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摘要

The mechanical behavior of cold-worked stress-relieved Zr-2.5Nb pressure tube material used in pressurized heavy-water reactors is summarized in terms of ultimate tensile strength (UTS), yield strength (YS), and percentage elongation to fracture, strain-rate sensitivity (m), strain-hardening index (n), and activation energy for the self-diffusion of zirconium. Tensile tests carried out in the temperature range of 298 to 773 K at three different strain rates are used to calculate n and m. At higher temperatures, UTS, YS, percentage elongation, and n are found to be strain rate dependent. The plateaus observed in curves for UTS or YS versus temperature are typical of dynamic strain aging behavior. The drop In strength at high temperature is correlated with the self-diffusion of zirconium in a-phase zirconium by comparing the activation energies of the two phenomena. Transmission electron microstructures of thin foils from samples tested at ambient temperature and at 773 K are used to explain the observed variation of n and m with test temperature. A similar trend in the variation of m and percentage elongation with temperature Is also explained.
机译：根据极限抗拉强度（UTS），屈服强度（YS）以及断裂伸长率，应变-应力，总结了用于压力重水反应堆的冷加工消除应力的Zr-2.5Nb压力管材料的机械性能。速率敏感性（m），应变硬化指数（n）和锆自扩散的活化能。在三种不同的应变率下，在298至773 K的温度范围内进行的拉伸试验用于计算n和m。在较高的温度下，发现UTS，YS，伸长百分比和n与应变速率有关。在UTS或YS与温度的关系曲线中观察到的平稳期是动态应变时效行为的典型特征。通过比较两种现象的活化能，高温下强度的下降与锆在a相锆中的自扩散相关。在环境温度和773 K下测试的样品的薄膜的透射电子显微结构用于解释观察到的n和m在测试温度下的变化。还解释了m和伸长百分率随温度变化的类似趋势。

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