According to the Korea Advanced Institute of Science & Technology (Kaist), a research team, led by Professor Sungchul Lee from the Department of Mechanical Engineering in cooperation with Professor Hyoung Seop Kims Team, has successfully completed the strength dukility ductivity dilemma of TI-6AL-4V alloy alloy alloy plants High strengths and the production of high strengths enable successfully through the production of high strengths and the production of high strengths and the production of high strengths and the production of high strengths and the production of high strengths. The KI developed by the team predicts the mechanical properties based on various 3D printing process parameters and at the same time provides uncertainty information.
Laser powder fusion (LPBF) is often used for 3D-printti-6al-4V alloy-a material that is known for its high strength and biocompatibility. However, this 3D printed alloy traditionally had challenges to achieve high strength and high ductility. Although there were attempts to solve this problem by adapting both the pressure process parameters and the heat treatment conditions, the large number of possible combinations have made it difficult to examine them all by experiments and simulations alone.
The active learning frame developed by the team quickly examines a wide range of 3D printing process parameters and heat treatment conditions to recommend those who are intended to improve the strength and ductility of the alloy. These recommendations are based on the predictions of the AI model about the final tensile strength and the overall stretch as well as the associated uncertainty information for each sentence of process parameters and heat treatment conditions.
The recommended conditions are then validated by carrying out 3D printing and train tests in order to obtain the actual mechanical properties. This new data is included in another AI model training, and iterative research was determined by the optimal process parameters and the heat treatment conditions for the generation of high-performance alloys in just five iterations. With these optimized conditions, the 3D-printed TI-6AL-4V alloy achieved an ultimate tensile strength of 1190 MPa and a total expansion of 16.5%what has successfully overcome the strength dukility duk.
“In this study, we were able to develop a top-class TI-6AL-4V alloy with minimal experimental studies by optimizing the 3D printing process parameters and the heat treatment conditions. Compared to previous studies, we have created a alloy with a similar ultimate tensile strength, but a higher overall stretch as well as that with a similar stretch, but a greater ultimate tensile strength, ”said Professor Seungchul Lee. “If our approach is not only applied to mechanical properties, but also to other properties such as thermal conductivity and thermal expansion, we assume that it enables efficient exploration of 3D pressure parameters and heat treatment conditions.”
The study was published in Nature Communications and research was supported by the National Research Foundation of the Koreas -Nano & Material Technology Development Program and the leading research center.