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Toughening Behavior in Alloy 617 with Long Term Ageing

机译：长期时效的617合金的增韧行为

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The influence of ageing at temperature 700℃ for up to 20 000 hours on the deformation, damage and fracture behavior of Alloy 617 has been investigated by two toughness tests. Dense nano y' phase and carbides are the main precipitates. However, the long-term aged material still shows high toughness. The mechanism has been studied using electron backscatter detector (EBSD) and electron channeling contrast imaging (ECCI). The results show that dense nano/micro-twins have been formed in the adjacent of the fracture front during the impact toughness or CTOD testing. Increase of ageing time reduces the number of nano/micro-twins, but they can be observed in all aged materials in spite of different strain rates. This indicates that besides dislocation slip, twinning is another deformation mechanism in long term aged material during the toughness tests. Formation of nano/micro-twins may be one of contributions to high toughness in the aged material, which is termed as twin induced toughening.
机译：通过两次韧性试验，研究了700℃下长达2万小时的时效对617合金变形，损伤和断裂行为的影响。主要的析出物是致密的纳米y'相和碳化物。但是，长期老化的材料仍显示出高韧性。已经使用电子反向散射检测器（EBSD）和电子通道对比度成像（ECCI）研究了该机制。结果表明，在冲击韧性或CTOD测试过程中，在断裂前沿附近形成了致密的纳米/微孪晶。老化时间的增加会减少纳米/微孪晶的数量，但是尽管应变速率不同，但在所有老化的材料中都可以观察到它们。这表明，除位错滑移外，孪晶是韧性试验中长期老化材料中的另一种变形机制。纳米/微孪晶的形成可能是对时效材料的高韧性的一种贡献，这被称为孪生诱导增韧。

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