边界条件对多晶奥氏体不锈钢中晶格应变演化的影响。

Effect of boundary conditions on the evolution of lattice strains in a polycrystalline austenitic stainless steel.

作者信息

Wang Y Q, Hossain S, Kabra S, Zhang S Y, Smith D J, Truman C E

机构信息

1Department of Mechanical Engineering, University of Bristol, Bristol, BS8 1TR UK.

2School of Materials, The University of Manchester, Oxford Rd, Manchester, M13 9PL UK.

出版信息

J Mater Sci. 2017;52(13):7929-7936. doi: 10.1007/s10853-017-0997-6. Epub 2017 Mar 17.

DOI:10.1007/s10853-017-0997-6

PMID:32103836

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7010389/

Abstract

The effect of boundary conditions (constant load, constant strain and elastic follow-up) on lattice strain evolution during creep in a polycrystalline austenitic stainless steel was studied using in situ neutron diffraction at 550 °C. The lattice strains were found to remain constant under constant load control. However, under constant strain and elastic follow-up control, the lattice strains relaxed the most in the elastically softest lattice plane {200} and the least in the elastically stiffest lattice plane {111}. The intergranular stresses created between different grain families were constant during creep tests irrespective of the boundary conditions with the initial applied stresses of 250 MPa.

摘要

在550°C下，使用原位中子衍射研究了边界条件（恒定载荷、恒定应变和弹性跟随）对多晶奥氏体不锈钢蠕变过程中晶格应变演化的影响。发现在恒定载荷控制下晶格应变保持恒定。然而，在恒定应变和弹性跟随控制下，晶格应变在弹性最软的晶格平面{200}中松弛最大，在弹性最硬的晶格平面{111}中松弛最小。在蠕变试验期间，不同晶粒族之间产生的晶间应力是恒定的，与初始施加应力为250MPa的边界条件无关。