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Thermal creep behavior in heat-treated and modified textured Zr-Excel pressure tube material

机译:热处理和改性织构Zr-Excel压力管材料的热蠕变行为

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Thermal creep properties of Zr-Excel alloy (Zr-3.5 wt% Sn-0.8 wt% Nb-0.8 wt% Mo) have been investigated in this study. The limits of existing experimental data on the current material and the search for more isotropic properties in Pressure Tube (PT) material motivates the current study. Heat-treatment on Excel PT materials leads to significant microstructural changes, where a strong texture of the As-Received (ASR) PT materials has been altered to a different degree of randomness at various solution temperatures. Microstructural alteration through heat-treatments should have an influence on the thermal creep behavior of the current material. It is observed that at a relatively high creep test temperature (> 300 ℃), steady-state creep rate of both ASR and heat-treated materials depends on the applied stress in a power law fashion and approaches stress exponent value of ~3. However, at a relatively low test temperature, n showed a high value in all treatments. The activation energy (Q) for the creep mechanism has been found to be microstructure-dependent. The ASR material has a Q value of ~73 to ~114 kJ/mol at the applied test temperature range (150-350 ℃). However, martensitic structure formation and other microscopic changes (dislocation structures and elemental segregation) caused significant increase in Q values up to -325 kJ/mol in the heat-treated materials. A significant decrease has been observed in creep anisotropy in the WQ-895 treatment for which texture has been moderately randomized.
机译:在这项研究中,研究了Zr-Excel合金(Zr-3.5 wt%Sn-0.8 wt%Nb-0.8 wt%Mo)的热蠕变性能。当前材料的现有实验数据的局限性以及在压力管(PT)材料中寻求更多各向同性的要求推动了当前的研究。在Excel PT材料上进行热处理会导致显着的微观结构变化,其中在各种溶液温度下,As-Received(ASR)PT材料的坚固质地已更改为不同程度的随机性。通过热处理进行的微观结构改变应该对当前材料的热蠕变行为产生影响。可以看出,在较高的蠕变测试温度(> 300℃)下,ASR和热处理材料的稳态蠕变速率均以幂定律方式取决于所施加的应力,并且接近〜3的应力指数值。但是,在相对较低的测试温度下,n在所有处理中均显示出较高的值。已经发现蠕变机理的活化能(Q)与微观结构有关。在所施加的测试温度范围(150-350℃)下,ASR材料的Q值为〜73至〜114 kJ / mol。但是,马氏体结构的形成和其他微观变化(位错结构和元素偏析)导致热处理材料中的Q值显着增加,最高达到-325 kJ / mol。在WQ-895处理中,已经观察到蠕变各向异性的显着降低,其纹理已被适当地随机化了。

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