• 제목/요약/키워드: Friction Stir Process(FSP)

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마찰교반프로세스를 이용한 금속기 복합소재 제조 및 특성 (Manufacturing and Properties of Metal Based Composite Produced By Friction Stir Processing)

  • 최돈현;연윤모;정승부
    • Journal of Welding and Joining
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    • 제30권5호
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    • pp.27-33
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    • 2012
  • Friction stir processing (FSP), developed based on the basic principles of friction stir welding(FSW), a solid-state joining process originally developed for various metal alloys, is an emergingmetalworking technique that can provide localized modification and control of microstructures in near-surface layers of processed metallic components. The FSP causes intense plastic deformation, material mixing, and thermal exposure, resulting in significant microstructural refinement, densification, and homogeneity of the processed zone. The FSP technique has been successfully used for producing the fine-grained structure and surface composite, modifying the microstructure of materials, and synthesizing the composite and intermetallic compound in situ. In this review article, the current state of the understanding and development of FSP is addressed.

마찰교반용접(FSW) 및 마찰교반처리(FSP)의 최신 연구개발 동향 (Recent Research & Development Trend on Friction Stir Welding and Friction Stir Processing)

  • 이광진
    • Journal of Welding and Joining
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    • 제31권2호
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    • pp.26-29
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    • 2013
  • 마찰교반용접(FSW) 및 마찰교반처리(FSP) 기술 관련 국제 심포지움인 'Friction Stir Welding & Processing VII'에서 발표된 연구논문의 내용을 토대로 아래와 같이 최신 연구개발 동향을 정리하였다. ${\cdot}$ 알루미늄합금과 마그네슘합금의 경량금속에 대한 마찰교반용접이 주류를 이루었던 과거와 달리 최근에는 구조용 연강, 고강도강, 초내열합금 및 타이타늄 합금 등의 고융점 금속재료에 대한 마찰교반용접 공정기술 및 툴의 개발이 수행되고 있다. ${\cdot}$ 주조재 표면 조직의 균질화 및 나노 사이즈의 초미세 결정립 조직을 얻기 위한 개질(改質)을 비롯하여 CNTs 및 Graphene 등의 첨단 탄소소재를 판재의 표면에 코팅 또는 판재 내부에 분산시켜 금속기 나노탄소복합재(MMNCC: Metal Matrix Nano Carbon Composites)의 제조 및 기계적 특성 향상을 목적으로 하는 FSP 관련 연구가 다각적으로 수행되고 있다. ${\cdot}$ 마찰교반용접 공정 중의 접합부의 형성 및 금속유동(Metal flow)에 대한 모델링(Modeling) 관련 연구가 다수 진행되고 있으며, 수학적 해석 및 실시간 모니터링을 통한 연구가 의욕적으로 진행되고 있다.

경량 마그네슘 합금의 표면 신뢰성 향상을 위한 마찰교반공정의 적용 (Application of Friction Stir Process to Improve Surface Reliability of Light Weight Magnesium Alloy)

  • 길응찬;김재연;현창용
    • 한국신뢰성학회지:신뢰성응용연구
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    • 제16권2호
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    • pp.155-161
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    • 2016
  • Purpose: Purpose of this study is to analyze the effect of particle size as well as number of pass on surface microstructure and hardness of SiC(p)/AZ31 surface composite fabricated by friction stir process (FSP). Method: SiC(p)/AZ31 surface composite containing different size of SiC particle (i. e., $2{\mu}m$ and $8{\mu}m$) was fabricated by multi-pass FSP. Microstructure was observed by scanning electron microscope and surface hardness was determined by Vickers hardness tester. Results: For all the FSPed specimens with and without hardening particles, grain size was refined due to dynamic recrystallization behavior. Surface hardness was observed to increase with decreasing particle size in the composite layer. Increasing number of FSP pass was effective for homogeneous distribution of the hardening particles and for resulting increase in surface hardness. Conclusion: FSP was effective to modify surface microstructure for improving surface hardness of SiC/AZ31 composite.

A16061-T6 마찰교반용접시 핀 형상과 이송속도가 기계적 강도에 미치는 영향에 관한 연구 (A Study on the Effect that Pin Shape and Welding Speed have an Influence on Mechanical Strength in Friction Stir Welding A16061-T6)

  • 박희상;이영호;최원두;고준빈
    • 한국공작기계학회논문집
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    • 제17권4호
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    • pp.22-28
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    • 2008
  • Friction stir welding(FSW) is an relatively new solid state joining process. A1606l-T6 aluminium alloy has gathered wide acceptance in the fabrication of light weight structures requiring a high strength to weight ratio and good corrosion resistance. This friction stir process(FSP) uses a non-consumable tool to generate frictional heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, etc., and tool pin profile playa major role in deciding FSP zone formation in A16061-T6 aluminium alloy. Tow different tool pin profiles have been used to fabricate the joints. The formation of friction stir processed zone has been analysed macroscopically. Tensile properties of the joints have been evaluated and correlated with the friction stir processed zone formation.

피로강도 향상을 위한 표면마찰교반법의 가공조건 및 비드형상 (Bead Shape and Conditions of Friction Stir Processing to Improve Fatigue Strength)

  • 박정웅;안규백;김흥주;조병철
    • Journal of Welding and Joining
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    • 제31권4호
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    • pp.73-79
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    • 2013
  • Burr grinding, Tungsten Inert Gas (TIG) dressing, ultrasonic impact treatment, and peening are used to improve fatigue life in steel structures. These methods improve the fatigue life of weld joints by hardening the weld toe, by improving the bead shape, and by creating the compressive residual stress. In this study, a new post-weld treatment method improving the weld bead shape and metal structure at the welding zone using Friction Stir Processing (FSP), a welding process, is proposed to enhance fatigue life. For that, a pin-shaped tool and processing condition employing Friction Stir Processing (FSP) is established through experiments. Experimental results revealed that fatigue life is improved by around 50% compared to as-welded fatigue specimens by reducing the stress concentration at the weld toe and by generating a metal structure finer than that of flux-cored arc welding (FCAW).

마찰교반공정을 통한 강재의 개질 영역에서의 미세조직에 미치는 합금원소의 영향 (Effect of Alloy Elements on Microstructure of Modified Area via Friction Stir Process in Steel Materials)

  • 김상혁;이광진;우기도
    • 한국재료학회지
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    • 제25권8호
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    • pp.370-375
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    • 2015
  • In this study, to confirm the effect of alloying elements on the phase transformation and conditions of the friction stir process, we processed two materials, SS400 and SM45C steels, by a friction stir process (FSP) under various conditions. We analyzed the mechanical properties and microstructure of the friction stir processed zone of SS400 and SM45C steels processed under 400RPM - 100mm/min conditions. We detected no macro (tunnel defect) or micro (void, micro crack) defects in the specimens. The grain refinement in the specimens occurred by dynamic recrystallization and stirring. The microstructure at the friction stir processed zone of the SS400 specimen consisted of an ${\alpha}$-phase. On the other hand, the microstructure at the friction stir processed zone of the SM45 specimen consisted of an ${\alpha}$-phase, $Fe_3C$ and martensite due to a high cooling rate and high carbon content. Furthermore, the hardness and impact absorption energy of the friction stir processed zone were higher than those of base metals. The hardness and impact absorption energy of FSPed SM45C were higher than that of FSPed SS400. Our results confirmed the effect of alloying elements on the phase transformation and mechanical properties of the friction stir processed zone.

A6061-T6과 A5052-H32재의 이종 마찰교반용접시 핀 형상이 기계적 강도에 미치는 영향에 관한 연구 (A Study on the Effect that Pin Shape on Mechanical Strength in Dissimilar Friction Stir Welding A6061-T6 and A5052-H32)

  • 박희상;최원두;고준빈;이영호;신기석;김인철;최만용
    • 한국생산제조학회지
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    • 제18권3호
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    • pp.270-278
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    • 2009
  • Friction stir welding is a relatively new solid state joining process. A6061-T6 and A5052-H32 aluminium alloy has gathered wide acceptance in the fabrication of light weight structures requiring a high strength to weight ratio and good corrosion resistance. This friction stir process uses a non-consumable tool to generate frictional heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, etc., and tool pin profile play a major role in deciding FSP zone formation in A6061-T6 and A5052-H32 aluminium alloy. Three different tool pin profiles have been used to fabricate the dissimilar butt joints. The formation of friction stir processed zone has been analysed macroscopically. Tensile properties of the joints have been evaluated and correlated with the friction stir processed zone formation.

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EFFECT OF PROCESS VARIABLES ON FRICTION STIRRED MICROSTRUCTURE AND SURFACE HARDNESS OF AZ31 MAGNESIUM ALLOY

  • JAE-YEON KIM;JUNG-WOO HWANG;SEUNG-MI LEE;CHANG-YOUNG HYUN;IK-KEUN PARK;JAI-WON BYEON
    • Archives of Metallurgy and Materials
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    • 제64권3호
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    • pp.907-911
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    • 2019
  • Effects of various friction stir processing (FSP) variables on the microstructural evolution and microhardness of the AZ31 magnesium alloy were investigated. The processing variables include rotational and travelling speed of the tool, kind of second phase (i.e., diamond, Al2O3, and ZrO2) and groove depth (i.e., volume fraction of second phase). Grain size, distribution of second phase particle, grain texture, and microhardness were analyzed as a function of the FSP process variables. The FSPed AZ31 composites fabricated with a high heat input condition showed the better dispersion of particle without macro defect. For all composite specimens, the grain size decreased and the microhardness increased regardless of the grooved depth compared with that of the FSPed AZ31 without strengthening particle, respectively. For the AZ31/diamond composite having a grain size of about 1 ㎛, microhardness (i.e., about 108 Hv) was about two times higher than that of the matrix alloy (i.e., about 52 Hv). The effect of second phase particle on retardation of grain growth and resulting hardness increase was discussed.