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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.3: Design and Analysis >INITIATION AND ARREST OF DELAYED HYDRIDE CRACKING IN Zr-2.5Nb TUBES
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INITIATION AND ARREST OF DELAYED HYDRIDE CRACKING IN Zr-2.5Nb TUBES

机译：Zr-2.5Nb钢管中氢化物裂纹的引发和抑制

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摘要

Using Kim's delayed hydride cracking (DHC) model, this study reanalyzes the critical temperatures for DHC initiation and arrest in Zr-2.5Nb tubes that had previously been investigated with Dutton and Puls's DHC model. At temperatures over 180℃ along with a hydrogen concentration of over 15 ppm H, the DHC initiation in a CANDU Zr-2.5Nb tube was suppressed, which required a cooling or AT from the terminal solid solubility for dissolution (TSSD) temperatures. With the number of the thermal cycle increasing, the DHC initiation temperatures or T_cs gradually shifted towards the TSSD. At a hydrogen concentration as low as 7 ppm H and temperatures lower than 180℃, a DHC initiation occurred at temperatures near the TSSD with little △T. Different DHC initiation temperatures with hydrogen concentrations are discussed in view of precipitation of hydrides in the zirconium matrix either by a cooling or by a stress-induced γ- to δ-hydride transformation. The DHC arrest temperatures were governed by the critical supersaturated hydrogen concentration or △C regardless of the thermal cycle treatment. By correlating the DHC cracking and arrest temperatures with the supersaturated hydrogen concentration or △C for the DHC cracking and arrest, we conclude that the △C arising from the hysteresis of the terminal solid solubility of hydrogen on a heat-up and on a cool-down is the driving force for the DHC.
机译：本研究使用Kim的延迟氢化物裂解（DHC）模型，重新分析了先前由Dutton和Puls的DHC模型研究过的Zr-2.5Nb管中DHC引发和停止的临界温度。在超过180℃的温度和超过15 ppm H的氢气浓度下，CANDU Zr-2.5Nb管中的DHC引发受到抑制，这需要从溶解时的最终固溶度（TSSD）温度开始冷却或冷却。随着热循环次数的增加，DHC起始温度或T_cs逐渐移向TSSD。在氢浓度低至7 ppm H且温度低于180℃时，在TSSD附近且△T很小的温度下发生DHC引发。考虑到通过冷却或应力诱导的从γ-到δ-氢化物的转变，锆基质中的氢化物沉淀，讨论了氢浓度不同的DHC起始温度。不管热循环处理如何，DHC的停止温度都由临界过饱和氢浓度或△C决定。通过将DHC裂解和阻滞温度与DHC裂解和阻滞的过饱和氢浓度或△C相关联，我们得出结论，△C是由氢在加热和冷却时最终固溶度的滞后引起的。是DHC的驱动力。

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