{"id":610604,"date":"2024-02-28T19:00:01","date_gmt":"2024-02-28T16:00:01","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/scientists-propose-anti-fatigue-preparation-for-3d-printed-titanium-alloy\/"},"modified":"2024-02-28T19:00:01","modified_gmt":"2024-02-28T16:00:01","slug":"scientists-propose-anti-fatigue-preparation-for-3d-printed-titanium-alloy","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/scientists-propose-anti-fatigue-preparation-for-3d-printed-titanium-alloy\/","title":{"rendered":"#Scientists propose anti-fatigue preparation for 3D-printed titanium alloy"},"content":{"rendered":"
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\n (a1-d1) 3D visualization images of the quasi in situ<\/i> XRT test sample evaluating the size and spatial distribution of microvoids. (a2-d2) Reconstructed orientation maps of prior \u03b2 grains based on the EBSD results of the \u03b1 phase revealing the change in the size and morphology of the prior \u03b2 grains. (a3-d3) Inverse pole figures (IPF) of the \u03b1 phase indicating the size and orientation distribution of \u03b1 laths and colonies. (a4-d4) STEM micrographs showing the size and distribution of the \u03b1\/\u03b1\u2032 laths and \u03b2 phases. Based on several systematic studies, the Net-AM microstructure is ultimately obtained after the NAMP technique. Credit: IMR
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A research team led by Profs. Zhang Zhefeng and Zhang Zhenjun from the Institute of Metal Research of the Chinese Academy of Science<\/a>s has proposed an innovative strategy to fabricate an anti-fatigue 3D-printed titanium alloy by separately regulating their microstructure and defects, called as net-additive manufacturing preparation (NAMP).<\/p>\n

The research is published<\/a> in the journal Nature<\/i>.<\/p>\n

Additive manufacturing (AM), also known as three-dimensional (3D) printing, is a disruptive technology<\/a> in the manufacturing field. However, the poor fatigue performance of 3D-printed materials under cyclic loading\u2014compared with traditional manufacturing\u2014seriously limits the app<\/a>lication of such materials as structural components in important fields such as space exploration and aviation.<\/p>\n

In this study, in terms of their previous fatigue prediction theories, the researchers proposed a groundbreaking concept: 3D-printed microstructures (i.e., Net-AM microstructures) have naturally high fatigue resistance. However, their low-fatigue performance of 3D materials may be overshadowed by the negative effects of microvoids induced by the current printing process.<\/p>\n

To verify this concept, they invented the Net-Additive Manufacturing Process (NAMP), including a hot-isostatic pressing (HIP) to eliminate the microvoids and a subsequent high-temperature-short-time (HTSt) heat treatment to restore the AM microstructure with fine martensite lath, which can successfully restore a nearly void-free Net-AM microstructure to the titanium alloy.<\/p>\n

Interestingly, the Net-AM microstructure has remarkably high fatigue resistance, which exceeds the resistance of all other additively manufactured and even forged titanium alloys. The Net-AM microstructure also shows the highest specific fatigue strength (i.e., fatigue strength\/density) of all reported materials in the world.<\/p>\n