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首页> 外文期刊>Materials Science and Engineering >Modelling of the evolution of micro-grain misorientations during creep of tempered martensite ferritic steels
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Modelling of the evolution of micro-grain misorientations during creep of tempered martensite ferritic steels

机译：回火马氏体铁素体钢蠕变过程中微晶取向错误演变的建模

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摘要

Tempered martensite ferritic steels are prone to low-angle boundary (LAB) vanishing and micro-grain size increase during creep deformation. A physically based model of LAB vanishing during creep deformation is presented. The LABs are modelled by simple dislocation arrays following the Read and Shockley model. Depending on the activated slip systems, mobile edge/screw dislocations annihilate with LAB parallel dislocations of opposite sign. The LAB misorientation frequency evolution versus creep strain can be analytically computed. The material parameters are the fractions of edge/screw dislocations in the LABs and the critical edge/screw dislocation annihilation distances. Different LAB misorientation frequencies obtained by electron backscatter diffraction (EBSD) and available in the literature are used as input data of the simulations. The computed LAB misorientation frequencies are then compared with the experimental frequencies obtained at different creep strains. If the material parameters belong to physical ranges, their influence on the predictions remain rather weak. The model generally permits a reasonable prediction of misorientation and micro-grain size evolutions during creep. Finally, the effects of precipitate evolution, climb and internal stresses are discussed.
机译：回火马氏体铁素体钢在蠕变变形过程中容易出现低角度边界（LAB）消失和微晶粒度增加的现象。提出了基于物理的LAB蠕变变形消失的模型。 LAB通过遵循Read和Shockley模型的简单位错阵列进行建模。根据激活的滑移系统，可移动边缘/螺钉位错会随着符号相反的LAB平行位错而消失。可以对LAB取向错误的频率演变与蠕变应变进行分析计算。材料参数是LAB中边缘/螺钉位错的分数和临界边缘/螺钉位错an灭距离。通过电子背散射衍射（EBSD）获得并在文献中可获得的不同LAB取向差频率被用作模拟的输入数据。然后将计算出的LAB取向错误频率与在不同蠕变应变下获得的实验频率进行比较。如果材料参数属于物理范围，则它们对预测的影响仍然很弱。该模型通常可以合理预测蠕变过程中的取向错误和晶粒尺寸的演变。最后，讨论了析出物，爬升和内应力的影响。

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