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RISS 인기검색어
- 검색키워드
- 저자 : Dmitriy Yu. Ozherelkov (검색결과 2 건)
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Anton Yu. Nalivaiko,Dmitriy Yu. Ozherelkov,Ivan A. Pelevin,Stanislav V. Chernyshikhin,Andrey E. Medvedev,Andrey V. Korshunov,Alexey N. Arnautov,Alexander A. Gromov 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
The synthesis features for 3D samples of AlSi10MgCualloy were investigated. Two types of samples were used: single tracksand cubic samples of 10 mm3volumes obtained by selective laser melting. 3D printing regimes and samples characteristicswere compared for both types of samples. A comprehensive characterization of the initial AlSi10MgCualloy powder wasperformed. The morphology, microstructure, and micro-hardness of the obtained single tracks and cubic samples werestudied. The mechanism of the porosity formation was discussed in detail. A formation of pores and non–uniform structureswas evidently caused by non–equilibrium crystallization during the selective laser melting process, namely 3D samples fastcooling. The lower porosity and the more uniform structure were obtained with higher values of laser power (from 220 to240 W) Values of laser power had a crucial influence on the morphology and microstructure of the obtained 3D material. Optimal modes for selective laser melting for experimental AlSi10MgCupowder were revealed based on the microstructureand micro-hardness data. The values of the micro-hardness were varied from 115.5 to 151.1 HV. The micro-hardness forsamples was increased on average by 20 HV after additional heat treatment. It was caused, most probably, by the separationof the Al2Cuphase.
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Laser Polishing of Nickel-Titanium Shape Memory Alloy Produced via Laser Powder Bed Fusion
Stanislav V. Chernyshikhin,Daniil V. Panov,Tran Van Tuan,Dmitriy Yu. Ozherelkov,Vadim A. Sheremetyev,Igor V. Shishkovsky 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
Laser Powder Bed Fusion (LPBF) is considered a promising technology for NiTi intermetallic components production. However, different defects such as near-surface porosity inherent to the process are limiting the standardization and widespread of the technology due to the deterioration of the mechanical properties. In this work, a comprehensive study was implemented to reduce the near-surface porosity by the laser polishing of additively manufactured samples from pre-alloyed NiTi powder by LPBF. Different laser polishing process conditions were employed for the treatment of the near-surface region. Results have shown that the most effective treatment aimed at porosity healing occurs at a laser power of 540 W, a scanning speed of 25 mm/s, a hatch spacing of 200 μm, and a laser spot of 500 μm. The phase identification and martensite-austenite transformation temperatures characterization were carried out before and after the laser polishing of the NiTi samples; the influence of the laser polishing on the functional properties of the material was demonstrated. It was shown that the application of required linear energy density for successful healing of the near-surface porosity leads to the local solutionizing effect. Additionally, electrochemical studies were carried out in Hank's solution and demonstrated that the corrosion resistance was improved after laser polishing.
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