Comparison of Notched Bar Creep Behavior of Various Alloys
Comparison of Notched Bar Creep Behavior of Various Alloys
复制标题
各种合金缺口棒蠕变行为的比较
DOI：
10.1115/pvp2010-26096
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Yukio Takahashi
中科院分区：
文献类型：
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作者：
Yukio Takahashi
在高温下工作的各种部件的设计中，需要评估蠕变断裂的可能性。除了单轴拉伸下的蠕变断裂行为外，多轴应力状态需要在许多部件中处理，并且其适当考虑是至关重要的。为了研究高应力三轴度下的蠕变断裂行为，对发电设备中使用的各种合金的切口棒试样进行了蠕变试验。结果发现，所有的材料表现出缺口强化行为，但有些材料表现出相当大的减少在断裂时的变形，与平原标本相比。它的量不相似，但强烈依赖于材料，在高铬钢中较大，在奥氏体不锈钢中较小。结果发现，每种材料的真实断裂应变对温度和非弹性应变率的依赖性可以通过应变率-温度参数成功地建模。
Possibility of creep rupture needs to be evaluated in design of various components operating at high temperatures. Multiaxial stress states need to be treated in many components and its proper consideration is of critical importance, in addition to the creep rupture behavior under uniaxial tension. In order to examine creep rupture behavior under high stress triaxiality, creep tests were conducted on notched bar specimens of various alloys used in power generation facilities. It was found that all materials showed notch-strengthening behavior but some materials showed considerable reduction of deformation at rupture, in comparison with the plain specimens. Its amount was not similar but strongly dependent on material, being larger in high chromium steels, and smaller in an austenitic stainless steel. It was found that the dependency of true rupture strain on temperature and inelastic strain rate in each material can be successfully modeled by a strain rate-temperature parameter.Copyright © 2010 by ASME