Micro–macro creep damage simulation for welded joints
Micro–macro creep damage simulation for welded joints
复制标题
焊接接头的微观-宏观蠕变损伤模拟
DOI：
10.3184/096034011x13123545763673
复制
发表时间：
2011
影响因子：
1.3
通讯作者：
M. Fujita
中科院分区：
文献类型：
--
作者：
T. Igari;T. Fukahori;F. Kawashima;T. Tokiyoshi;Y. Chuman;N. Komai;M. Fujita
摘要对火电厂管道焊缝进行IV型蠕变损伤评估是火电厂剩余寿命预测的重要内容。实际蠕变损伤首先是微观的，如小缺陷的萌生和合并，最后是宏观的，如裂纹状缺陷的扩展。本文概述了基于晶界-断裂抗力模型的微宏观联合蠕变损伤模拟，并将其应用于低合金钢焊缝和高铬钢焊缝的蠕变损伤模拟。首先讨论了2.25Cr -1Mo钢（ASME P-22）等低合金钢焊缝的模拟建模，并给出了实验室蠕变断裂试样和实际动力管道焊缝的应用实例。其次，对改性9Cr -1Mo钢（ASME P-91）焊接接头热影响区小缺陷的数量密度进行了再现试验。证明了预测微观损伤的可能性。
Abstract Assessment of Type IV creep damage in pipe welds is important for residual life prediction of fossil power plants. Actual creep damage is firstly microscopic, such as the initiation and coalescence of small defects, and lastly macroscopic, such as the propagation of crack-like defects. In this paper, an outline of the micro – macro combined creep damage simulation on the basis of the grain-boundary-fracture-resistance model is shown, and is applied to the creep damage simulation of both low-alloy steel welds and high-chromium steel welds. Firstly modelling of the simulation for low-alloy steel welds such as 2.25Cr –1Mo steel (ASME P-22) is discussed, and application examples are shown such as creep rupture specimens in the laboratory and welds in actual power piping. Secondly a trial is carried out to reproduce the number density of small defects in the heat-affected zone of welded joints of modified 9Cr –1Mo steel (ASME P-91). The possibility of predicting the microscopic damage is demonstrated.