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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >THE THERMAL STABILITY OF SURFACE DEFORMED ZIRCONIUM
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THE THERMAL STABILITY OF SURFACE DEFORMED ZIRCONIUM

机译：表面变形锆的热稳定性

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This study examined the microstructural and mechanical changes in shot-peened zirconium resulting from extended exposures to temperatures between 200 and 300 degrees C. The peening hardens the surface region which extends to about 300 mu m from the surface. It was discovered that the outermost (10-50 mu m) shot-peened surface decreases in hardness from approximately 230 VHN (DPH) to about 220 VHN after 560 h at 200 degrees C. The same drop in hardness was observed after about 5.5 h at 300 degrees C. Further drops in hardness with time were observed at 300 degrees C to a minimum surface hardness of 206 VHN after 560 h. Longer times at 200 and 300 degrees C did not appear to significantly affect the hardness. These decreases in hardness were determined from hardness depth profiles before and after heat treating the zirconium to various times from 0.5 to 4458 h. The hardness between 150 and 300 mu m (the less deformed region) was approximately unaffected by the thermal treatments, The grain dislocation structure of the shot-peened zirconium was examined in the as-peened as well as the annealed conditions using polarized light optical and transmission electron microscopy. These observations are consistent with an explanation of decreased hardness based on static recovery without any static recrystallization. (C) 1997 Elsevier Science B.V. [References: 26]
机译：这项研究检查了喷丸硬化锆的微观结构和机械变化，这些变化是由于长时间暴露于200至300摄氏度之间的温度而引起的。喷丸硬化了表面区域，该区域从表面延伸到大约300微米。发现最外层（10-50微米）的喷丸处理表面在200摄氏度下经过560小时的硬度从大约230 VHN（DPH）降低到大约220 VHN。在大约5.5 h后观察到相同的硬度下降在300摄氏度时。在560小时后，在300摄氏度下观察到硬度进一步下降，最低表面硬度为206 VHN。在200和300摄氏度下较长的时间似乎并未显着影响硬度。这些硬度的降低是由锆热处理前后0.5至4458 h的硬度深度曲线确定的。 150至300μm之间的硬度（变形程度较小的区域）几乎不受热处理的影响。喷丸硬化锆的晶粒位错结构在喷丸状态以及退火条件下使用偏振光光学和透射电子显微镜。这些观察结果与基于静态恢复而没有任何静态重结晶的硬度降低的解释一致。 （C）1997 Elsevier Science B.V. [参考：26]

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