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首页> 外文会议>Thirteenth International Symposium on Zirconium in the Nuclear Industry; Jun 10-14, 2001; Annecy, France >Influence of Hydrogen Content on the Phase Transformation Temperatures and on the Thermal-Mechanical Behavior of Zy-4, M4 (ZrSnFeV), and M5~(TM) (ZrNbO) Alloys During the First Phase of LOCA Transient
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Influence of Hydrogen Content on the Phase Transformation Temperatures and on the Thermal-Mechanical Behavior of Zy-4, M4 (ZrSnFeV), and M5~(TM) (ZrNbO) Alloys During the First Phase of LOCA Transient

机译：氢含量对LOCA瞬态第一相期间Zy-4，M4（ZrSnFeV）和M5〜（TM）（ZrNbO）合金的相变温度和热机械行为的影响

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To simulate the end-of-life behavior of cladding tubes during the first phase of a LOCA transient, one may assume that the main effect of a long service exposure on the cladding deformation behavior during LOCA arises from the hydrogen uptake associated with the cladding oxidation at high burn-up. Thus, the recent metallurgical studies and EDGAR [2] tests performed on pre-hydrided Zr-base alloys are presented. The influence of hydrogen has been studied for concentrations ranging from ～100 up to ～1000 (weight) ppm on Framatome-ANP low-tin Zy-4, M4 (ZrSnFeV), and M5~(TM)(ZrNbO) alloys. The decrease of the α/β phase transformation temperatures with the increase of the hydrogen content is noticeable and has been quantified, and then modeled, for both quasi-equilibrium (caLorimetry) and dynamic (dilatometry) conditions for heating rates up to 100℃/s. Some complementary microstructural examinations on hydrided samples, beforehand partially transformed into β phase, have been performed to get a better insight of the metallurgical features associated with the hydrogen effects. Finally, the EDGAR thermal-mechanical test results are presented and discussed. The alloys have been tested under steady state conditions of pressure and temperature, on the one hand, and with continuous heating (thermal ramps) on the other. The results show that the mechanical behavior cannot be explained solely by the effect of hydrogen on the shift of the α/β phase transformation temperatures, but that hydrogen modifies also the creep behavior and the burst criterion, especially in the α domain, and in the lower α+β temperature range. As a result, hydrogen decreases the creep strength and the ductility of the materials, the effect being greater for higher hydrogen content. All these data are used to model the thermal-mechanical behavior of the hydrided cladding tubes in order to simulate the LOCA behavior of the clad after long-term in-service exposure. Finally, preliminary thermal ramp tests under uniaxial loading performed on irradiated Zy-4 are presented and compared to the behavior of non-irradiated as-received and hydrided Zy-4. These last experiments were made to validate the assumption that the main effect of a long service exposure on the cladding deformation behavior during the first phase of LOCA is mainly linked to the hydrogen uptake associated with the cladding oxidation.
机译：为了模拟LOCA瞬态的第一阶段包层管的寿命终止行为，可以假设长期服务暴露对LOCA期间包层变形行为的主要影响是由于与包层氧化相关的氢吸收高燃尽。因此，介绍了对预水合Zr基合金进行的最新冶金研究和EDGAR [2]测试。已研究了氢浓度对Framatome-ANP低锡Zy-4，M4（ZrSnFeV）和M5〜（TM）（ZrNbO）合金的影响，其浓度范围从〜100至〜1000（重量）ppm。随着氢气含量的增加，α/β相变温度的降低是明显的，并且已经量化，然后对准平衡（量热法）和动态（膨胀法）条件下升温速率高达100℃/ s。已对预先部分转变为β相的氢化样品进行了一些补充性的微结构检查，以更好地了解与氢效应相关的冶金特征。最后，介绍并讨论了EDGAR的热机械测试结果。一方面，已在压力和温度的稳态条件下对合金进行了测试，另一方面，对合金进行了连续加热（热升温）。结果表明，不能仅通过氢对α/β相变温度变化的影响来解释力学行为，但是氢还可以改变蠕变行为和爆裂准则，尤其是在α区域和较低的α+β温度范围。结果，氢降低了材料的蠕变强度和延展性，对于更高的氢含量，效果更大。所有这些数据都用于对氢化覆层管的热机械行为进行建模，以模拟长期在长期暴露后覆层的LOCA行为。最后，介绍了对辐照过的Zy-4在单轴载荷下进行的初步热升温试验，并将其与未经辐照的原样和水合Zy-4的行为进行了比较。进行这些最后的实验是为了验证以下假设：长期暴露在LOCA第一阶段期间对包层变形行为的主要影响主要与与包层氧化相关的氢吸收有关。

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