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NTIS 바로가기소성가공 = Transactions of materials processing : Journal of the Korean society for technology of plastics, v.29 no.1, 2020년, pp.11 - 19
이지우 (한밭대학교 신소재공학과) , 조훈휘 (한밭대학교 신소재공학과) , (울산대학교 기계공학부) , (울산대학교 기계공학부) , 홍성태 (울산대학교 기계공학부)
For microstructural analysis of a friction stir welded (FSWed) joint of advanced high-strength steels, dual phase (DP) and complex phase (CP) steels, are studied. FSWed joints are successfully fabricated in the following four cases: (i) DP/DP; (ii) CP/CP; (iii) DP/CP, where the advancing side is DP ...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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마찰교반접합은 어떤 접합기술인가? | 마찰교반접합(Friction Stir Welding, FSW)은 Fig. 1 과 같이 나사산 형태의 돌기(probe)를 가지는 비소모성 공구(tool)를 고속으로 회전시키면서 모재에 삽입함으로써 양쪽의 재료를 혼합시키는 접합기술이다 [9–12]. 실제로 공정 중에는 상호마찰에 의해 대량의 열이 발생하고, 이러한 마찰열에 의한 재료의 연화가 일어남과 동시에 공구에 의한 강제적인 소성 유동이 일어난다. | |
용융용접을 할 경우 생길 수 있는 문제점은? | 가장 광범위하게 사용되는 조립방법은 용접이며, 다른 방법들보다 원가측면에서 유리하다고 할 수 있다. 하지만, 일반적인 용융용접시에는 기공에 의한 결함이 나 열영향부(Heat Affected Zone, HAZ)의 조대화 (coarsening) 및 인성과 연성, 내식성이 감소할 수 있어 기계적 성질이 저하될 가능성이 크다 [7,8]. | |
경량화라는 시대적 요구 부응을 위해 차세대 자동차용 소재로 기대되는 초고강도강은? | 특히, 경량화라는 시대적 요구에 부응하여, 강도 및 성형성이 우수한 초고강도강을 자동차용 소재에 적용하기 위해 철강 업체들의 연구 개발은 점차 가속화 되고 있다. 그 중에서도 이상(Dual Phase, DP)강과 복합상(Complex Phase, CP)강은 우수한 강도와 가공성이 뛰어난 특징을 가지고 있어, 경량화에 기여할 차세대 자동차용 소재로 기대된다 [3]. |
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