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대입열 EH36-TM강의 Tandem EGW 용접부 미세조직 및 기계적 성질
정홍철,박영환,안영호,이종봉,Jeong, Hong-Chul,Park, Young-Hwan,An, Young-Ho,Lee, Jong-Bong 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.1
In the coarse grained HAZ of conventional TiN steel, most TiN particles are dissolved and austenite grain growth easily occurrs during high heat input welding. To avoid this difficulty, thermal stability of TiN particles is improved by increasing nitrogen content in EH36-TM steel. Increased thermal stability of TiN particle is helpful for preventing austenite grain growth by the pinning effect. In this study, the mechanical properties and microstructures of high heat input welded Tandem EGW joint in EH36-TM steel with high nitrogen content were investigated. The austenite grain size in simulated HAZ of the steel at $1400^{\circ}C$ was much smaller than that of conventional TiN steel. Even for high heat input welding, the microstructure of coarse grained HAZ consisted of fine ferrite and pearlite and the mechanical properties of the joint were sufficient to meet all the requirements specified in classification rule.
용접 열영향부 미세조직 및 재질 예측 모델링 : III. 석출물 - Free 저합금강의 초기 오스테나이트 결정립크기의 영향을 고려한 용접 열영향부 오스테나이트 결정립성장 예측 모델
엄상호,문준오,정홍철,이종봉,이창희,Uhm, Sang-Ho,Moon, Joon-Oh,Jeong, Hong-Chul,Lee, Jong-Bong,Lee, Chang-Hee 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.4
The austenite grain growth model in low alloyed steel HAZ without precipitates was proposed by analyzing isothermal grain growth behavior. Steels used in this study were designed to investigate the effect of alloying elements. Meanwhile, a systematic procedure was proposed to prevent inappropriate neglect of initial grain size (D0) and misreading both time exponent and activation energy for isothermal grain growth. It was found that the time exponent was almost constant, irrespectively of temperature and alloying elements, and activation energy increased with the addition of alloying elements. From quantification of the effect of alloying elements on the activation energy, an isothermal grain growth model was presented. Finally, combining with the additivity rule, the austenite grain size in the CGHAZ was predicted.