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Waspaloy 터빈디스크의 열간 단조시 결정립분포 해석에 관한 연구
염종택,이종수,김정한,이동근,박노광,Yeom, Jong-Taek,Lee, Chong-Soo,Kim, Jeoung-Han,Lee, Dong-Geun,Park, Nho-Kwang 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.2
The microstructure evolution during a hot forging of Waspaloy was investigated using the recrystallization model and FEM simulation. In order to obtain an uniform microstructure, hot forging was carried out by two step. The change of grain size during hot forging has a deep connection with dynamic recrystallization behavior. Avrami-type constitutive equation for the dynamic recrystallization was implemented into an user subroutine of 2D FE simulator. The evolution of grain structure in the two-step forging of Waspaloy was simulated using the 2D FEM user-subroutine. The detailed variation of microstructures due to dynamic recrystallization could effectively be predicted at various locations in a forged pancake.
Ti-6Al-4V합금의 열간 후방압출에 대한 성형 안정성 평가모델의 고찰
염종택,박노광,이유환,신태진,황상무,홍성석,심인옥,이종수,Yeom Jong-Taek,Park Nho-Kwang,Lee You-Hwan,Shin Tae-Jin,Hwang Sang-Mu,Hong Sung-Suk,Shim In-Ok,Lee Chong-Soo 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.3
The metal forming behavior of Ti-6Al-4V tube during hot backward extrusion was investigated with various forming stabilities or instabilities criteria. that is, Ziegler's instability criterion, dynamic materials model(DMM) stability criteria and Rao's instability criterion. These approaches also were coupled to the internal variables generated from FE simulation. In order to validate the reliabilities of three criteria, hot backward extrusions for Ti-6Al-4V tube making were carried out with different backward extrusion designs. The useful model for predicting the forming defects was suggested through the comparison between experimental observations and simulation results.
고온 자전 합성시 반응열 제어가 TiAl 미세 조직에 미치는 영향에 관한 연구
문종태,염종택,신봉문,김용석,이용호,Mun, Jong-Tae,Yeom, Jong-Taek,Sin, Bong-Mun,Kim, Yong-Seok,Lee, Yong-Ho 한국재료학회 1995 한국재료학회지 Vol.5 No.7
TiAi intermetallic compound has been extensively studied for possible high temperature structural applications because of its high specific strength at high temperature, high creep resistance, and good oxidation resistance at elevated temperatures. In addition to its good properties, an economic manufacturing routes should be developed for this material to be used more extensively. One of the promising route in manufacturing TiAl intermetallics is the Self-propagating High-temperature Synthesis (SHS) method. Thus in this study, an attempt was made to study the mechanism of the SHS process in TiAl synthesis. The composition of the sample was Ti-(45, 50, 53)at% Al and the microstuctures of the products were analyzed using optical microscope and scanning electron microscope. When the phases formed at the main SHS reaction of whicyh combustion temperature is higher than the melting temperature of aluminum were identified as TiAl and Ti$_3$Al ; Ti$_3$Al cores surrounded by TiAl phase. In order to increase the combustion temperature, carbon was added 5 and 10at.%. When the carbon content was 10at.%, the heat of the reaction was large enough to melt the phase formed and that is consistent with the theoretical calculation results of the adiabatic temperature. The combution temperatue, which was measured by a computer data acquisition system, increased with the carbon content. The phases formed from the reaction involving the carbon added were indentified as TiAl and Ti$_2$AlC using XRD. The vickers hardness of the reaction product increased with the carbon content.
황병선,염종택,이진우,Hwang, Byeong-Seon,Yeom, Jong-Taek,Lee, Jin-U 재료연구소 2009 機械와 材料 Vol.21 No.2
본 고는 중대형 풍력터빈의 핵심부품인 로터 블레이드, 대형베어링, 증속기, 발전기, 전략변환장치, 타워 등에 사용되는 주요재료에 대한 설명과 제조방법 및 평가 방법 등에 대해 다루어 졌다. 일반적으로 풍력터빈을 구성하는 소재는 금속소재와 비금속재료로 구분되며, 비금속재료는 대부분 복합재료로써 풍력 블레이드에 적용되고 있다. 현재 육상용 풍력터빈의 한계를 극복하기 위한 대안으로, 해상용 풍력터빈에 대한 관심이 집중되고 있으며, 이러한 극지 해상의 대형 시스템에 활용되고 있는 금속소재의 경우, 고강도, 저온인성, 내피로, 내식성 등이 우수한 강재를 요구하기에 이르렀다. 이에 따라, 여러 소재 측면의 요구를 충족하기 위한 소재설계의 비중이 점차 고조되고 있으며, 이러한 시점에 본 고를 통해 풍력터빈에 활용되고 있는 소재의 전반적인 내용과 관련 소재부품의 제조 및 평가 방법등의 이해를 돕고자 한다.