文献类型：期刊文献

英文题名：Influence of notch root radius on high cycle fatigue properties and fatigue crack initiation behavior of Ti-55531 alloy with a multilevel lamellar microstructure

作者：Zhang, Zhong Huang, Chaowen Xu, Zilu Yang, Jiang Long, Shaolei Tan, Changsheng Wan, Mingpan Liu, Dan Ji, Shengli Zeng, Weidong

第一作者：Zhang, Zhong

通信作者：Huang, CW[1];Huang, CW[2];Huang, CW[3];Tan, CS[4]

机构：[1]Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China;[2]Guizhou Anda Aviat Forging Co Ltd, Anshun 561000, Peoples R China;[3]Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China;[4]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[5]Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China

第一机构：Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China;corresponding author), Guizhou Anda Aviat Forging Co Ltd, Anshun 561000, Peoples R China;corresponding author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China;corresponding author), Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China.

年份：2023

卷号：24

起止页码：6293-6311

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：;EI(收录号：20231914056520);Scopus(收录号：2-s2.0-85156164214);WOS:【SCI-EXPANDED(收录号:WOS:001043354200001)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 51801037, 52061005, 52261025, and 52001253) , the Science and Technology Projects of Guizhou Province (Nos. [2020] 1Y196 and [2021] 310) , the Scientific Research Program Funded by Shaanxi Provincial Education Department of China (21JY028) . The authors would like to thank Dr. Xin Wen from Chongqing University, Prof. Yilong Liang from Guizhou University, and Dr. Chao Zhu from MogoEdit for their useful discussions and language help. We also thank Dr. Xuehao Zheng from ZKKF (Beijing) Science & amp; Technology Company for supporting of TEM analysis.

语种：英文

外文关键词：Ti-55531 alloy; Notch high cycle fatigue; Multilevel lamellar microstructure; Fatigue crack initiation

摘要：Notch high cycle fatigue (HCF) properties and microcrack initiation behavior of Ti-55531 alloy with a multilevel lamellar microstructure under various notch radii were systemat-ically investigated. Results indicate that the reduction of notch root radius significantly promotes fatigue microcrack initiation, and then dramatically reduces the HCF life and strength of the alloy. Cyclic deformation of the alloy is mainly controlled by the slipping and deformation twinning ina plates. The primary fatigue crack initiation micro-mechanism is a/b interface cracking induced by slipping and twinning at all notch HCF specimens. Moreover, the volume fraction of twinning would increase with decreasing of the notch root radius. Interestingly, when the notch root radius is the smallest (R 1/4 0.14 mm) and the stress concentration factor is the largest (Kt 1/4 4), in addition to slipping and twinning, basal stacking faults promoting the cracking of a/b interface could be another crucial HCF microcrack initiation mechanism of the alloy. Furthermore, with decreasing of notch root radius and increasing of stress concentration factor, the size of cycle plastic deformation zone at notch root gradually reduces to the size of a colony and even the a plate. Therefore, the order of influential degree of three different levels microstructure on the crack initiation mechanism of notched HCF can be arranged as a plate > a colony > b GB.& COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).