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자료유형
학술저널
저자정보
최우혁 (현대제철 기술연구소) 조성규 (현대제철 기술연구소) 최원규 (현대제철 기술연구소) 고상기 (현대제철 기술연구소) 한종만 (현대제철 기술연구소)
저널정보
대한용접·접합학회 대한용접·접합학회지 大韓熔接·接合學會誌 第30卷 第1號
발행연도
2012.2
수록면
64 - 71 (8page)

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The characteristics of high heat input (342kJ/㎝) EG (Electro Gas Arc) welded joint of EH36-TM steel has been investigated. The weld metal microstructure consisted of fine acicular ferrite (AF), a little volume of polygonal ferrite (PF) and grain boundary ferrite (GBF). Charpy impact test results of the weld metal and heat affected zone (HAZ) met the requirement of classification rule (Min. 34J at -20 ℃). In order to evaluate the relationship between the impact toughness property and the grain size of HAZ, the austenite grain size of HAZ was measured. The prior austenite grain size in Fusion line (F.L+0.1 ㎜) was about 350 ㎛. The grain size in F.L+1.5 ㎜ was measured to be less than 30 ㎛ and this region was identified as being included in FGHAZ(Fine Grain HAZ). It is seen that as the austenite grain size decreases, the size of GBF, FSP (Ferrite Side Plate) become smaller and the impact toughness of HAZ increases. Therefore, the CGHAZ was considered to be area up to 1.3㎜ away from the fusion line.
Results of TEM replica analysis for a welded joint implied that very small size (0.8~1.2㎛) oxygen inclusions played a role of forming fine acicular ferrite in the weld metal. A large amount of (Ti, Mn, Al)xOy oxygen inclusions dispersed, and oxides density was measured to be 4,600-5,300 (ea/㎟). During the welding thermal cycle, the area near a fusion line was reheated to temperature exceeding 1400℃. However, the nitrides and carbides were not completely dissolved near the fusion line because of rapid heating and cooling rate. Instead, they might grow during the cooling process. TiC precipitates of about 50 ~ 100㎚ size dispersed near the fusion line.

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Abstract
1. 서론
2. 실험 방법
3. 실험 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2013-581-001591603