期刊
SCRIPTA MATERIALIA
卷 231, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2023.115457
关键词
-
The microstructural changes of cyclic loaded AISI 347 stainless steel were investigated to determine the true endurance limit at 573 K. Fatigue tests were conducted using stress control and a load frequency of 980 Hz. Even in specimens that reached the endurance limit at 5 x 10^8 cycles, local cyclic plastic deformation and slip bands formation were observed. Transmission electron microscopy revealed additional microstructural effects such as nano-twin formation and alpha '-martensite formation. However, the alpha '-martensitic transformation is not the main mechanism responsible for the observed true endurance limit in AISI 347 at 573 K.
Microstructural changes were investigated regarding the existence of the true endurance limit of a cyclic loaded metastable austenitic stainless steel AISI 347 in the very high cycle regime at 573 K. The fatigue tests were performed in stress control with a stress load ration R =-1 using a servo-hydraulic testing system with a load frequency of 980 Hz. Local cyclic plastic deformation and slip bands formation were observed even in the specimens that achieved the endurance limit at 5 x 108 cycles. Moreover, in these specimens further microstructural effects like nano-twins and alpha '-martensite formation were detected by transmission electron microscopy. While nano-twin formation takes place in the bulk material, the alpha '-martensite nucleates at the specimen's surface. Therefore, the alpha '-martensitic transformation is not the main mechanism responsible for the true endurance limit observed in the investigated AISI 347 at 573 K.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据