首页> 美国政府科技报告 >Modeling the Role of Dislocation Substructure During Class M and ExponentialCreep
【24h】

Modeling the Role of Dislocation Substructure During Class M and ExponentialCreep

机译:在m类和ExponentialCreep期间建模位错子结构的作用

获取原文

摘要

The different substructures that form in the power-law and exponential creepregimes for single phase crystalline materials under various conditions of stress, temperature, and strain are reviewed. The microstructure is correlated both qualitatively and quantitatively with power-law and exponential creep as well as with steady state and non-steady state deformation behavior. These observations suggest that creep is influenced by a complex interaction between several elements of the microstructure, such as dislocations, cells, and subgrains. The stability of the creep substructure is examined in both of these creep regimes during stress and temperature change experiments. these observations are rationalized on the basis of a phenomenological model, where normal primary creep is interpreted as a series of constant structure exponential creep rate-stress relationships. The implications of this viewpoint on the magnitude of the stress exponent and steady-state behavior are discussed. A theory is developed to predict the macroscopic creep behavior of a single phase material using quantitative microstructural data. In this technique the thermally activated deformation mechanisms proposed by dislocation physics are interlinked with a previously developed multiphase, three-dimensional, dislocation substructure creep model. This procedure leads to several coupled differential equations interrelating macroscopic creep plasticity with microstructural evolution.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号