S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
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Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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S&M2625 Research Paper of Special Issue

Fatigue Tests and Fracture Behavior Analysis of Porous Implant Materials Fabricated by 3D Metal Printing Technology

Ming-Hsien Hu, Chun-Ming Chang, Tan-Chih Chang, Yao-Tsung Yang, Chia-Hui Chien, Wan Ao, and Feng-Min Lai

(Received January 4, 2021; Accepted May 27, 2021)

Keywords: 3D printing of porous materials, mechanical properties, fatigue testing, heat treatment, manufacturing process

3D-printed Ti-6Al-4V materials can be used for implantation upon the confirmation of medical device specifications. Moreover, Young’s coefficient of porous Ti-6Al-4V is close to that of the human bone, and it can allow the growth of bone cells through holes to fuse with implant materials. In this study, porous Ti-6Al-4V samples were fabricated by 3D printing. The fabricated porous Ti-6Al-4V samples had four rows of holes in the front and one or two rows of holes in the side. The mechanical properties and fatigue lifetimes of the porous Ti-6Al-4V samples were analyzed, where the samples were prepared by selective laser melting (SLM) 3D printing followed by post–heat treatment at a temperature of 500, 700, or 925 ºC in a vertical tube furnace for 2 h with a heating rate of 10 °C/min. A tensile testing machine was used to measure Young’s modulus and tensile strength of the porous Ti-6Al-4V alloy samples. Upon microstructural observation by SEM, the as-fabricated 3D-printed sample showed a fine needle-like martensite structure, and the 500- and 700-℃-treated samples showed a needle-like β-structure. Additionally, the 925-℃-treated sample showed a coarse β-structure. The porous Ti-6Al-4V sample subjected to post–heat treatment at 500 ℃ had the lowest Young’s modulus and the highest tensile strength, where the strengths used in the fatigue testing were 0.1, 0.2, and 0.6 times the yield strength. The fatigue lifetimes of the porous Ti-6Al-4V samples with one and two rows of holes in the lateral side were 128,941 and 22,721 cycles at 0.2 times the yield strength, respectively.

Corresponding author: Feng-Min Lai

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