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Mg-4Al-2Sn 합금의 고온 기계적 특성에 미치는 Pd첨가의 영향
임시온,강병수,조대현,박익민,Yim, Si-On,Kang, Byoung-Soo,Cho, Dae-Hyun,Park, Ik-Min 한국주조공학회 2017 한국주조공학회지 Vol.37 No.4
This study investigated the effect of Pd on the microstructure, tensile and creep properties of Mg-4Al-2Sn (AT42) alloy at a high temperature for transportation-related industrial applications. AT42-xPd (x = 0, 1 and 2 wt. %) alloys were prepared using a permanent mould casting method. The microstructures of the as-cast alloys were characterized by the presence of the intermetallic phases $Mg_{17}Al_{12}$, $Mg_2Sn$ and $Al_4Pd$. The addition of Pd was found to improve the tensile properties of AT42 at room and at elevated temperatures, and to increase the creep resistance at elevated temperatures. A small amount of Pd could markedly improve the tensile properties of AT42 by means of grain-refinement and the dispersion of secondary phase strengthening. Moreover, the thermally stable phase $Al_4Pd$ effectively improves the creep resistance of AT42 due to the strengthened grain boundaries and the suppressed formation of $Mg_{17}Al_{12}$.
QMST/QCG 제도를 통한 잠수함 함정 체계개발단계 방법론 연구
서원범 ( Seo Won-bum ),임시온 ( Yim Si-on ),최영호 ( Choi Young-ho ),김병호 ( Kim Byeong-ho ) 한국품질경영학회 2020 품질경영학회지 Vol.48 No.3
Purpose: This paper is to study the methodology of the development stage of the submarine vessel through the QMST/QCG system. Methods: In order to study the methodology for supporting the development stage of the submarine vessel system, the mission and role for QMST were defined, and the timing and detailed plans of the QCG review were established. Results: Through the analysis of the development stage of the ship's weapon system, QMST was formed, and roles were divided for each subdivision, and methods to effectively support the DAPA IPT were specified. In addition, QCG review timing and plans for submarine safety control lists were established. Conclusion: It is expected that the methodology in the development stage discussed in this study will be useful as a reference when supporting the general weapon system development stage in addition to similar equipment.