Effect of combined plasma-carburizing and deep-rolling on notch fatigue property of Ti-6Al-4V alloy |
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| Authors: | N Tsuji S Tanaka T Takasugi |
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| Affiliation: | 1. Tanaka Ltd., 1-10-6 Tedukayama-naka, Sumiyoshiku, Osaka 558-0053, Japan;2. SDC Inc., 4-132-1 Kannabe-cho, Sakaiku, Sakai 590-0984, Japan;3. Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai 599-8531, Japan;1. Department of Materials Science and Engineering, Monash University, Australia;2. Baosteel Central Research Institute, Baosteel Group Corporation, China;3. Department of Mechanical and Aerospace Engineering, Monash University, Australia;1. Research Center for Advanced Manufacturing (RCAM), Lyle School of Engineering, Southern Methodist University, 3101 Dyer Street, Dallas, TX 75205, USA;2. Lyle School of Engineering, Southern Methodist University, 3101 Dyer Street, Dallas, TX 75205, USA;3. Restorative Sciences Department, Baylor College of Dentistry, Texas A&M Health Science Center, 3302 Gaston Ave, Dallas, TX 75246, USA;1. Department of Orthopedics, First Hospital of China Medical University, Shenyang, 110001, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;3. School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA, 6027, Australia;1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China |
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| Abstract: | This paper discusses the effects of a combination of plasma-carburizing and deep-rolling on notch fatigue properties of a Ti-6Al-4V alloy. Circumferentially V-notched cylindrical Ti-6Al-4V alloy specimens were plasma-carburized at a relatively low temperature for the improvement of wear resistance, and then, deep-rolled at the notch root for inducing compressive residual stress. Scanning electron microscopy, optical microscopy, laser scanning microscopy, surface roughness tester, and micro-hardness tester were used to characterize the modified surface layer at the notch root. Axial loading fatigue tests (R = 0.1) were performed using a servo-hydraulic testing machine in a laboratory atmosphere at an ambient temperature. The notch fatigue life of the specimen was reduced by plasma-carburizing due to the brittleness caused by the higher hardness in addition to the disappearance of compressive residual stress on the notched surface, but remarkably improved by the subsequent deep-rolling. The surface layer containing the compressive residual stress and the work hardening induced by deep-rolling effectively prevented and delayed the fatigue crack initiation and propagation of deep-rolled carburized specimen. |
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