Internal strains between grains during creep deformation of an austenitic stainless steel
Internal strains between grains during creep deformation of an austenitic stainless steel
复制标题
奥氏体不锈钢蠕变变形过程中晶粒间的内应变
DOI：
--
复制
发表时间：
2015
影响因子：
4.5
通讯作者：
P. Flewitt
中科院分区：
文献类型：
--
作者：
B. Chen;J. Hu;Y. Q. Wang;S. Kabra;A. Cocks;D. Smith;P. Flewitt
使用原位中子衍射测量奥氏体不锈钢蠕变过程中晶粒之间产生的内部应变。考虑了二次蠕变预应变试样。在 550 °C 蠕变变形之前、期间和之后进行了测量。在 550 °C 下原位蠕变 4 小时期间，晶粒之间的内应变没有可测量的变化。此外，还测量了 470 至 550 °C 范围内升高/降低温度对内部应变的影响，并根据热膨胀/收缩的贡献进行了解释。当样品在 530、510、490 和 470 °C 的停留时间内蠕变时，颗粒之间不会产生进一步的内部失配应变。讨论的结果涉及 (i) 自洽模型的一般结构和 (ii) 蠕变研究中子源的优化使用。
Internal strains that develop between grains during creep of an austenitic stainless steel were measured using in situ neutron diffraction. The secondary creep pre-strained test specimens were considered. Measurements were undertaken before, during and post creep deformation at 550 °C. There was no measurable change of internal strains between grains during in situ creep for 4 h at 550 °C. In addition, the effect of increasing/reducing temperatures in a range from 470 to 550 °C on the internal strains was measured and interpreted with respect to contributions from thermal expansion/contraction. No further internal misfit strains between grains were created when specimen crept during the dwell time at 530, 510, 490 and 470 °C. Results are discussed with respect to (i) the general structure of self-consistent models and (ii) the optimised use of neutron sources for creep studies.