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RISS 인기검색어
- 검색키워드
- 주제어 : Thermo mechanical controlled process(TMCP) (검색결과 5 건)
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RH 공정 조건이 다른 TMCP강의 개재물 및 기계적 특성
권영국,최병철,이금화,남기우 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.1
TMCP(Thermo Mechanical Control Process) steel was continuously cast (CC) by varying the argon gas flow rate and vacuum time in the Ruhrstahl Heraeus (RH) refining process. Using the CC specimens, the distribution of the inclusions and the mechanical properties were evaluated. A lot of oxides and Al-O type inclusions were observed. The average Vickers hardness did not show a constant, but showed dispersion in a certain range. The shape and scale parameters of the CC specimen with an argon gas flow rate of 160Nm3 and a vacuum time of 12 minutes was the best. Mechanical properties (tensile strength, yield strength and elongation) were consistent with the Weibull probability distribution analysis results. The impact resistance was the best for CC specimens with an argon flow rate of 140 Nm3 and a vacuum time of 12 minutes. Although the inclusions and mechanical properties of the CC specimens were evaluated according to the argon gas flow rate and vacuum time, these values were no significant difference.
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B과 Cu가 포함된 고강도 저합금강의 연속냉각 변태와 미세조직 및 기계적 특성
황병철,Hwang, Byoungchul 한국재료학회 2013 한국재료학회지 Vol.23 No.9
This study investigated the continuous cooling transformation, microstructure, and mechanical properties of highstrength low-alloy steels containing B and Cu. Continuous cooling transformation diagrams under non-deformed and deformed conditions were constructed by means of dilatometry, metallographic methods, and hardness data. Based on the continuous cooling transformation behaviors, six kinds of steel specimens with different B and Cu contents were fabricated by a thermomechanical control process comprising controlled rolling and accelerated cooling. Then, tensile and Charpy impact tests were conducted to examine the correlation of the microstructure with mechanical properties. Deformation in the austenite region promoted the formation of quasi-polygonal ferrite and granular bainite with a significant increase in transformation start temperatures. The mechanical test results indicate that the B-added steel specimens had higher strength and lower upper-shelf energy than the B-free steel specimens without deterioration in low-temperature toughness because their microstructures were mostly composed of lower bainite and lath martensite with a small amount of degenerate upper bainite. On the other hand, the increase of Cu content from 0.5 wt.% to 1.5 wt.% noticeably increased yield and tensile strengths by 100 MPa without loss of ductility, which may be attributed to the enhanced solid solution hardening and precipitation hardening resulting from veryfine Cu precipitates formed during accelerated cooling.
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TMCP 및 QT강 용접부에 있어 균열길이가 파괴특성에 미치는 영향
신용택(Y.T. Shin),신학수(H.S. Shin),강성원(S.W. Kang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
This experimental investigation focuses on an evaluation of fracture characteristics of API 2W Gr.50 (TMCP) and 580 ㎫ class high-strength steel (QT) weldments with respect to crack length to width ratio. Crack Tip Opening Displacement (CTOD) values from Single Edge Notched Bending (SENB) specimen are associated with the Charpy toughness of root weld located at the middle of the specimen thickness and showed lower toughness values according to the increasing crack length to width ratio. In fractography analysis, t. The hardness values of the reheated zone in weld metal are lower than the as solidified zone, and fractures are initiated at the reheated zone with low hardness values within the center third of section thickness.
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金敏男(M. N. Kim),吳世奎(S. K. Oh),全泰彦(T. E. Jeon),徐康泰(K. T. Seo),朴正培(J. B. Park) 한국해양공학회 1991 韓國海洋工學會誌 Vol.5 No.1
In this paper, an attempt has been taken for improving the weldability of wet welds of TMCP steel plate by shielding around weld arc surroundings. The principal results of this experimental investigation can be summarized as follows :<br/> 1) The cooling rates resulting from wet welds with the developed electrode on TMCP steel plate could be lower than that of the non-shieled wet welds.<br/> 2) The metallurgical characteristics in underwater wet welds of TMCP steel plate and the developed electrode could be improved by shielding around weld arc surroundings.
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입열량에 따른 FCAW용접부 파괴인성에 미치는 미세조직의 영향
신용택,강성원,김명현,Shin, Yong-Taek,Kang, Sung-Won,Kim, Myung-Hyun 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.3
This paper is to evaluate fracture characteristics of API 2W Gr.50 TMCP steel weldment typically applied for offshore structures, with the focus on the influence of heat input arising from flux cored arc welding. Based on the results and insights developed from this study, it is found that the toughness for both CTOD and impact exhibits a tendency to decrease as the weld heat input increases. The reheated zone of weldmetal exhibit lower hardness than solidified zone and microstructure that are liable to affect the toughness are acicular ferrite and martensite-austenite constituents (M-A). In particular, M-A is a more effective micro-phase for CTOD toughness than impact toughness.
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