• Title, Summary, Keyword: 순 티타늄

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Evaluation of plastic flow curve of pure titanium sheet using hydraulic bulge test (유압벌지실험을 이용한 순 티탄늄 판재의 소성유동곡선 평가(제2보))

  • Kim, Young-Suk;Kim, Jin-Jae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.4
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    • pp.718-725
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    • 2016
  • In this study, the plastic flow curve of commercially pure titanium sheet (CP Ti) actively used in the plate heat exchanger etc., was evaluated. The plastic flow curve known as hardening curve is a key factor needed in conducting finite element analyses (FEA) for the forming process of a sheet material. A hydraulic bulge test was performed on the CP Ti sheet and the strain in this test was measured using the DIC method and ARAMIS system. The measured true stress-true strain curve from the hydraulic bulge test (HBT) was compared with that from the tensile test. The measured true stress-true strain curve from the hydraulic bulge test showed stable plastic flow curve over the strain range of 0.7 which cannot be obtained in the case of the uniaxial tensile test. The measured true stress-true strain curve from the hydraulic bulge test can be fitted well by the hardening equation known as the Kim-Tuan model.

Comparison of histologic observation and insertional and removal torque values between titanium grade 2 and 4 microimplants (Grade 2, 4 티타늄 마이크로 임플랜트의 식립 및 제거 토크와 식립 후 조직학적 반응의 비교)

  • Kang, Sung-Taek;Sung, Jae-Hyun;Kyung, Hee-Moon;Park, Hyo-Sang;Kwon, Oh-Won
    • The korean journal of orthodontics
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    • v.36 no.3
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    • pp.171-177
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    • 2006
  • The purpose of this study was to evaluate the light microscopic features and the maximum insertional and removal torque value of microimplants, made from titanium grade 2 or 4, in the tibia of 6 rabbits. First, the maximum torque values of microimplants at implantation were measured. After 2, 8, and 12 weeks of healing time, the microimplant-containing segments of tibia of 2 rabbits were removed and the maximum removal torque of each microimplant were measured. Comparisons of histologic examination and insertional and removal torque values were carried out for the two groups of microimplants. Removal torque values were significantly increased in both groups after 8 and 12 weeks as compared to 2 weeks after implantation. Other values measured did not show any statistically significant differences and there were no histological differences between grade 2 and 4 titanium. Based on these results, this study showed that there were no significant differences between grade 2 and 4 titanium. It seems better to use grade 4 titanium for making microimplants because grade 4 titanium is mechanically harder than grade 2 titanium and has similar retention.

Weldability of Pure Titanium Thin plate for LPG Re-Condenser by Nd:YAG Laser - Physical Constant and Welding Parameter - (LPG 재응축기용 순티타늄 박판의 Nd:YAG 레이저 용접성(I) - 순티타늄의 물성과 용접변수 -)

  • Kim, Jong-Do;Gwak, Myeong-Seop;Lee, Chang-Je;Kim, Chang-Su
    • Proceedings of the KWS Conference
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    • pp.363-365
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    • 2007
  • Titanium and its alloys have excellent corrosion resistance, high strength to weight ratios and high temperature creep properties, which make them using many various fields of application. Responding to these needs, welding processes for titanium are also being used including TIG, MIG, resistance welding, plasma arc welding, diffusion welding, electron beam welding and laser welding. In this study, It is possible to get sound beads without humping bead and spatter with the decrease of peak power according to increase of pulse width and change of welding speed for heat input control at pulsed Nd:YAG laser welding of titanium plates for Lap welding.

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Effect of Surface Treatments and Glazing Temperatures on Bond Strength and Color Reproducibility in Titanium-Ceramic Prosthesis (티타늄의 표면처리와 저온용융도재의 글레이징 온도에 따른 티타늄-세라믹 보철물의 전단결합강도와 색조재현성)

  • Chung, In-Sung;Lee, Do-Chan
    • The Journal of the Korea Contents Association
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    • v.10 no.11
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    • pp.243-250
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    • 2010
  • The bonding strength and color reproducibility of titanium-ceramic prosthesis were analyzed the effect according to the surface treatments of titanium and the glazing temperatures of the low fused porcelain. The result of bonding strength compared with respect to the surface treatments was observed that the STB1 group coated by TiN had strongest boding strength and then came the SB1 group used special bonding agent, the SGB1 group coated by gold in that order. The bonding strength by the glazing temperature was indicated that the group with $770^{\circ}C$ of glazing temperature was observed increasing the bonding strength as compared with it of the other group, and the group with $810^{\circ}C$ of glazing temperature was observed to be decreased the bonding strength. Glazing temperature increases, the color by the surface treatment of titanium influenced the color of titanium-ceramic on account of getting higher brightness(${\Delta}L$). As a this result, the SB1 and SGB3 groups was evaluated to has the best color reproducibility.

Characteristics of Welds of Pure Titanium Plate Using Ultrasonic Attenuation (초음파 감쇠를 이용한 순 티타늄 판재의 용접부 특성)

  • Seon, Sang-Won;Yi, Won;Park, Hee-Dong;Hwang, Yeong-Tak
    • Journal of the Korean Society for Nondestructive Testing
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    • v.33 no.2
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    • pp.205-211
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    • 2013
  • This paper studies on mechanical properties, fractures, and ultrasonic characteristics of Pure Titanium welds using ultrasonic attenuation. Ti specimen was made by using AR purge gas. When the titanium weld specimen is fractured, Tensile tests were conducted in order to observe the ultrasonic signal changes. A scanning electron microscope(SEM) was used to observe changes in failure surface and an ultrasonic normal probe with the central frequency of 4 MHz was used to obtain ultrasonic signals. As a result, the value of the mechanical properties in the weld zone was lower than that in the base zone and heat affected zone(HAZ) from Ti. Also the grain size in the weld zone was bigger than that in the weld zone and HAZ from Ti. Ultrasonic signals using a RMS method presents correlation between envelope area and the tensile strength. Consequently, the ultrasonic method could be potential tool for integrity evaluation of the Ti weld zone.

Characteristics of Brazing of Eyewear Frame Ti Alloy with Electric Resistance (전기저항을 이용한 안경테용 Ti 합금의 땜질 특성)

  • Park, Jeong-Sik;Lee, Jeong-Yeong
    • Journal of Korean Ophthalmic Optics Society
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    • v.12 no.4
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    • pp.15-18
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    • 2007
  • Titanum and its alloys have been used as the important materials of eyewear frame because of its light weight, mechanical strength and corrosion resistance. This study investigated the characteristics of P-Ti and ${\beta}$-Ti alloys in accordance with joining conditions by electric resistance brazing. Hardness of P-Ti and ${\beta}$-Ti has been reduced because of an increase of grain size by the growth of brazing time. Hardness reduction and reduction area by grain growth were largely appeared in P-Ti than ${\beta}$-Ti.

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Effect of Surface Treatments of Titanium on Bond Strength and Interfacial Characterization in Titanium-Ceramic Prosthesis (티타늄의 표면처리방법에 따른 티타늄-세라믹 보철시편의 결합강도와 계면특성)

  • Chung, In-Sung;Kim, Chi-Young
    • The Journal of the Korea Contents Association
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    • v.10 no.10
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    • pp.219-225
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    • 2010
  • The bonding strength between titanium and ceramic were analyzed according to the bonding agent and the coating methods of Au and TiN respectively. The bonding strength was measured through the 3 point bending test. Consequently, the bonding strength of the special bonding agent after the TiN coated (SPTB) group was $72.20({\pm}5.25)MPa$ which was the strongest one among groups. The bonding strength of the special bonding agent treated only (SPB) group was $67.66({\pm}12.10)MPa$, the special bonding agent after the Au coating SPGB group was $46.95({\pm}12.48)MPa$ and the SP group was $43.80({\pm}5.12)MPa$. Taking these results into account, the bonding strength of the SPB group shows the same as it of the SPTB group, however, it is stronger than SP group. And the TiN coated SPTB group shows the stronger bonding strength than the Au coated SPGB group.

Weldability with Process Parameters During Fiber Laser Welding of a Titanium Plate (II) - The Effect of Control of Heat Input on Weldability - (티타늄 판재의 파이버 레이저 용접시 공정변수에 따른 용접특성 (II) - 입열량 제어에 따른 영향 -)

  • Kim, Jong Do;Kim, Ji Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.12
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    • pp.1055-1060
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    • 2016
  • Laser welding is a high-density energy welding method. Hence, deep penetration and high welding speed can be realized with lower heat input as compared with conventional welding. The heat input of a CW laser welding is determined by laser power and welding speed. In this study, bead and lap welding of $0.5mm^t$ pure titanium was performed using a fiber laser. Its weldability with laser power and welding speed was evaluated. Penetration, bead width, joining length, and bead shape were investigated, and the mechanical properties were examined through tensile-shear strength tests. Welds with sound joining length were obtained when the laser power and welding speed were respectively 0.5 kW and 2.5 m/min, and 1.5 kW and 6 m/min, and the weld obtained at low output presented better ductility than that obtained at high output.

Development of Manufacturing Process of Pure Titanium Wire to make Eyewear Frame (안경용 순티타늄 wire 제조 공정개발)

  • Choi, Gye-Hun;Kim, Sang-Yeoun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.3
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    • pp.1105-1110
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    • 2011
  • After pure titanium Ingot(G2) with 400mm in diameter was manufactured, the analysis of its ingredients showed that the oxygen content was 0.073wt% and the iron content was 0.03wt%, which made ASTM Gr.2 standardization satisfactory. The processed titanium ingot produced 42mm wire rod, and hot rolling of 18th phase produced 9mm wire rod. The hardness analysis of 15.8mm wire rod, which was processed in hot rolling of 10th phase from the surface to the center, resulted in almost constant value with Hv150~200. The last 9mm wire rod had a different yield strength and elongation percentage depending on the temperature as it was led in to a hot roller. However, tensile strength revealed an approximate value and made ASTM B863 standardization satisfactory.