晶体取向对单晶高温合金锯齿形屈服行为的影响

Crystallographic Orientation Influence on the Serrated Yielding Behavior of a Single-Crystal Superalloy.

作者信息

Segersäll Mikael, Moverare Johan J

机构信息

Department of Management and Engineering, Linköping University, Linköping 58183, Sweden.

Siemens Industrial Turbomachinery AB, Finspång 61283, Sweden.

出版信息

Materials (Basel). 2013 Jan 31;6(2):437-444. doi: 10.3390/ma6020437.

DOI:10.3390/ma6020437

PMID:28809317

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5452088/

Abstract

Since Ni-based single-crystal superalloys are anisotropic materials, their behavior in different crystal orientations is of great interest. In this study, the yielding behavior in both tension and compression for , and oriented materials at 500 °C has been investigated. The direction showed a serrated yielding behavior, a great tension/compression asymmetry in yield strength and visible deformation bands. However, the and directions showed a more homogeneous yielding, less tension/compression asymmetry in yield strength and no deformation bands. Microstructure investigations showed that the serrated yielding behavior of the direction can be attributed to the appearance of dynamic strain aging (DSA) and that only one slip system is active in this direction during plastic deformation.

摘要

由于镍基单晶高温合金是各向异性材料，它们在不同晶体取向的行为备受关注。在本研究中，对500°C下、和取向材料的拉伸和压缩屈服行为进行了研究。方向呈现出锯齿状屈服行为、屈服强度上较大的拉伸/压缩不对称性以及明显的变形带。然而，和方向呈现出更均匀的屈服、屈服强度上较小的拉伸/压缩不对称性且没有变形带。微观结构研究表明，方向的锯齿状屈服行为可归因于动态应变时效（DSA）的出现，并且在塑性变形过程中该方向只有一个滑移系起作用。