A precipitate evolution-based continuum damage mechanics model of creep behaviour in welded 9Cr steel at high temperature

被引：6
|
作者：
Murchu, C. O. [1 ,2 ]
Leen, S. B. [2 ,3 ]
O'Donoghue, P. E. [1 ,2 ]
Barrett, R. A. [2 ,3 ]
机构：
[1] NUI Galway, Civil Engn, Coll Engn & Informat, Galway H91 HX31, Ireland
[2] NUI Galway, Ryan Inst Enironm Marine & Energy Res, Galway H91 HX31, Ireland
[3] NUI Galway, Mech Engn, Coll Engn & Informat, Galway H91 HX31, Ireland
来源：
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS | 2019年 / 233卷 / 01期
基金：
爱尔兰科学基金会;
关键词：
Precipitates; weldments; 9Cr steels; damage mechanics; lifetime prediction; LONG-TERM CREEP; P91; STEEL; MICROSTRUCTURAL ZONES; WELDMENT; FAILURE; JOINT;
D O I：
10.1177/1464420718762607
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A multiaxial, physically based, continuum damage mechanics methodology for creep of welded 9Cr steels is presented, incorporating a multiple precipitate-type state variable, which simulates the effects of strain- and temperature-induced coarsening kinematics. Precipitate volume fraction and initial diameter for carbide and carbo-nitride precipitate types are key microstructural variables controlling time to failure in the model. The heat-affected zone material is simulated explicitly utilising measured microstructural data, allowing detailed investigation of failure mechanisms. Failure is shown to be controlled by a combination of microstructural degradation and Kachanov-type damage for the formation and growth of creep cavities. Comparisons with experimental data demonstrate the accuracy of this model for P91 material.
引用
收藏
页码：39 / 51
页数：13
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