• Title/Summary/Keyword: Titanium alloy

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Micro-hardness and Young's modulus of a thermo-mechanically processed biomedical titanium alloy

  • Mohammed, Mohsin Talib;Khan, Zahid A.;M., Geetha;Siddiquee, Arshad N.
    • Biomaterials and Biomechanics in Bioengineering
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    • v.1 no.3
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    • pp.117-130
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    • 2014
  • This paper presents a study on the influence of different thermo-mechanical processing (TMP) parameters on some required properties such as micro-hardness and Young's modulus of a novel near ${\beta}$ alloy Ti-20.6Nb-13.6Zr-0.5V (TNZV). The TMP scheme comprises of hot working above and below ${\beta}$ phase, solutionizing treatment above and below ${\beta}$ phase coupled with different cooling rates. Factorial design of experiment is used to systematically collect data for micro-hardness and Young's modulus. Validity of assumptions related to the collected data is checked through several diagnostic tests. The analysis of variance (ANOVA) is used to determine the significance of the main and interaction effects. Finally, optimization of the TMP process parameters is also done to achieve optimum values of the micro-hardness and Young's modulus.

Flow Stress Determination of Johnson-Cook Model of Ti-6Al-4V Material using 3D Printing Technique (3D 프린팅으로 제작한 Ti-6Al-4V 재료의 Johnson-Cook 모델의 유동 응력 결정)

  • Park, Dae-Gyoun;Kim, Tae-Ho;Jeon, Eon-Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.4
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    • pp.64-69
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    • 2018
  • This paper investigates the compressive deformation behavior of direct metal tooling (DMT), processing titanium alloy (Ti-6Al-4V) parts under high strain loading conditions. Split Hopkinson Pressure Bar (SHPB) experiments were performed to determine the flow stress and the coefficients of the Johnson-Cook model. This model is described as a function of strain, strain rate, and temperature. SHPB experiments were performed to characterize the deformation behavior of specimens made with 3D printers, using Ti-6Al-4V material under high temperature and dynamic loading.

NEW PROGRESS IN TiN-BASED PROTECTIVE COATINGS DEPOSITED BY ARC ION PLATING

  • Huang, R.F.;Wen, L.S.
    • Journal of Surface Science and Engineering
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    • v.32 no.3
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    • pp.265-275
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    • 1999
  • Titanium nitride and related overlayers produced by arc ion plating (AIP) are applied as commercial coatings in world-wide scale since the middle of 80s. Due to the achievements of low temperature deposition (LTD), they begin now to be used as wear and corrosion-resistant coatings for machine parts, besides applications on cemented carbide and high speed steel cutting tools. On the other side, TiN can be now applied successfully to brass, Al-alloy, ZnAl alloy articles as decorative coating through LTD. Various nitrides, carbonitrides, borides and other refractory compounds, such as (Ti, Al)N, TiCN, CrN, are used as the coatings for special heavy-duty working conditions instead of TiN since 90s. More and more multilayer coatings are applied now substituting single layer ones. Duplex processes are under development.

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The effect of TIG Dressing on titanium alloy weldment (티타늄 합금 용접부에 대한 TIG Dressing 재용접 효과에 대한 연구)

  • Yang, Hae-Jin;Yi, Hui-Jun;Lee, Jung-Soo;Oh, Myung-Hwan
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.04a
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    • pp.303-306
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    • 2011
  • 티타늄 용접부의 기공 형성은 용접 중 대기중으로부터 유입되거나 모재 표면의 산화막으로부터 확산과정을 통해 유입되는 산소 혹은 수소로 인해 형성된다고 알려져 있다. 용접부 기공은 용접부의 피로 수명과 인성을 저하시키며 취성 파괴의 원인이 된다. 이에 용접 후 비파괴 검사를 통해 용접부 기공을 확인하고 있으며 확인된 기공등의 결함은 재용접을 통해 제거하고 있다. 이번 연구에서는 기계적 가공 방법에 의해 기공을 제거한 후 재용접 하는 기존의 방식에서 벗어나 TIG Dressing 공법을 이용하여 용접부에 형성된 기공을 제거하고자 하였으며 이에 따른 용접부 노치 인성을 확인하였다. 시험 결과 TIG Dressing에 의한 기공 제거 효과와 노치 인성을 확인하였다.

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The Characteristics of Wire Electrical Discharge Machining and Final Surface Grinding for Titanium Alloy (티타늄합금의 와이어 방전가공과 후처리 연삭가공 특성)

  • 왕덕현;김원일;김종업
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.6
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    • pp.10-16
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    • 2002
  • Titanium alloys have the characteristics of lightness, high strength and good corrosion resistant and are broadly used in manufacturing parts for military and aerospace industries. These alloys are also recognized for organism materials comparatively and used as fixing ones in human body. Nevertheless titanium alloys have excellent properties, it is difficult to machine by traditional methods because of high hardness and chemically activated property. So higher tool wear is expected when cutting by conventional tools, so it is required nontraditional machining process. Finally, the mechanical characteristics such as surface roughness, shape and hardness on studied for wire electrical discharge machined and pound surfaces of titanium alloys for different heat-tested conditions.

A Study on the Cutting Characteristics and Analysis by a FEM in the Machining of Ti-6Al-4V alloy (Ti-6Al-4V 합금의 절삭특성과 FEM 해석 비교에 관한 연구)

  • 김남용;홍우표;이동주
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.6
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    • pp.29-35
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    • 2001
  • The cutting characteristics of Ti-6Al-4V alloy and total wear when machining Ti-6Al-4V alloy was studied to understand the machining characteristics. This material is one of the strong candidate materials present and future aerospace or met ical applications. Nowadays their usage has already been broaden to commercial applications such as golf club head, finger rings and many decorative items. Anticipating the general use of this material and development of the titanium alloy in domestic facilities, the review and the study of the machining parameters far those alloys are deemed necessary. This study is concentrated to the machining parameters of the Ti-6Al-4V alloy due to their dominant position in the production of tita mum alloys.

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A study on corrosion resistance of Ti-Nb alloys by Nb contents (Nb 함량에 따른 Ti-Nb계 합금의 내식성에 대한 연구)

  • Park, Geun-Hyeung
    • Journal of Technologic Dentistry
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    • v.28 no.1
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    • pp.61-66
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    • 2006
  • Titanium alloys have been used for dental materials due to it's very good biocompatibility. Ti-6Al-4V alloy instead of pure titanium is being widely used as biomaterials has some characteristics such as high fatigue strength, tensile strength and corrosion resistance. But it has been reported recently that the vanadium element expresses cytotoxicity and carcinogenicity and the aluminium element is related with dementia of Alzheimer type and neurotoxicity. The Ti-Nb alloys has designed and examined corrosion resistance. Ti-3wt.%Nb($\alpha$type), Ti-20wt.%Nb(${\alpha}+{\beta}$type) and Ti-40wt.%Nb($\beta$type) alloys were melted by vacuum arc furnace. The corrosion resistance of Ti alloys was evaluated by potentiodynamic polarization test in the solution of 0.9% NaCl and 5% HCl. The results can be summarized as follows: 1) For the corrosion test in the solution of 0.9% NaCl and 5% HCl, the corrosion behaviour of Ti-Nb alloys was similar to ASTM grade 2 CP Ti. 2) The corrosion resistance of Ti-20Nb alloy was better than that of CP-Ti, Ti-3Nb, Ti-40Nb alloy in 0.9% NaCl and 5% HCl, solutions.

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