Mechanical properties of laser-welded cast titanium joints under different conditions

Chai, Tsongi; Chou, Chia Kai

doi:10.1016/s0022-3913(98)70165-9

Cited by 74 publications

(102 citation statements)

References 6 publications

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“…In cast titanium prostheses, hard and brittle cast surfaces are generated by the reaction between molten titanium and investment material during casting due to their high chemical reactivity (inclusion of impurities such as oxygen, nitrogen and carbon occurs) [18] compared to machined titanium for CAD/CAM restoration. The laser surface treatment applied in this study modified surface microstructure and enhanced the mechanical strength, particularly for the tensile strength of the specimens laser-treated at 300V.…”

Section: Discussionmentioning

confidence: 99%

“…Chai and Chou [18] reported that pulse duration is not a significant factor to affect the Ultimate Tensile Strength (UTS) or the Yield Strength (YS). They concluded that the mechanical properties were influenced by the minor interstitial dissolved elements such as oxygen, nitrogen and carbon, and that if too many impurities enter into the titanium, the mechanical properties become brittle.…”

Section: Discussionmentioning

confidence: 99%

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Microstructure and mechanical properties of surface treated cast titanium with Nd:YAG laser

Poulon-Quintin¹,

Watanabe²,

Watanabe³

et al. 2012

Dental Materials

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Objective: To investigate the effect of laser surface treatment of cast titanium alloy on microstructure and mechanical properties.Methods: Dumbbell-and plate-shaped cast titanium specimens were prepared for mechanical testing and microstructure analysis. After the cast surfaces of each specimen were laser-treated using a dental Nd:YAG laser machine at 240 V and 300 V with and without argon gas shielding, tensile testing and microstructure analysis were conducted.Hardness depth profiles were also made from the cross-section of laser-treated cast specimens. Microstructural and chemical analysis were performed by means of the SEM, XRD, AES and WDS.Results: The results of tensile testing and Vickers hardness depth profiling showed that laser treatment improved the mechanical properties. Bulk microstructure of as-cast titanium was mainly composed of α-grains with acicular and widmanstatten patterns.The laser melted zone was characterized by columnar beta grains. When the emission voltage of laser increased to 300 V, a larger grain size was promoted. The XRD analysis indicated that the beta phase formation was clearly noticeable after laser surface treatment. Supplementary marked peaks of the TiO, TiO 2 and Ti 2 N were detected without argon gas shielding. When argon shielding gas was used, the presence of titanium oxide was significantly reduced and the peaks of titanium nitride disappeared.Significance: Laser treatment on cast titanium surfaces showed significant enhancement of mechanical properties and modification of microstructures, and therefore could produce reliable titanium metal frameworks for dental prostheses.3

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Microstructure and mechanical properties of surface treated cast titanium with Nd:YAG laser

Poulon-Quintin¹,

Watanabe²,

Watanabe³

et al. 2012

Dental Materials

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“…Neste processo de união dos metais, a superfície formada é constituída por três zonas: cordão de solda, zona afetada pelo calor (ZAC) e metal base 14 , sendo que a qualidade desta junta obtida é um fator importante na determinação da resistência do metal soldado 15,16 .…”

Section: Introductionunclassified

“…Estudos preliminares 16,17,[22][23][24] demonstraram que é possível a utilização do método de soldagem TIG para união do Ticp, cujo equipamento tem um custo reduzido em relação ao laser.…”

Section: Introductionunclassified

Análise metalográfica do titânio puro submetido à soldagem laser Nd: YAG e TIG

Piveta

Ricci

Montandon

et al. 2013

Rev. odontol. UNESP

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ResumoIntrodução: Os métodos de soldagem mais utilizados em Odontologia não podem ser aplicados ao titânio puro e às suas ligas em função da alta reatividade do titânio com elementos atmosféricos; dessa forma, o mesmo não deve ser soldado por processo comum. Objetivo: O objetivo deste trabalho foi avaliar a característica metalúrgica do titânio comercialmente puro sem solda e submetido aos processos de soldagem a laser e TIG. Material e método: Foram confeccionados 15 corpos de prova em titânio comercialmente puro, cinco para cada condição, na forma de hastes cilíndricas, obtidas por fundição odontológica, sob atmosfera de gás argônio e vácuo, com calor produzido por um arco voltaico, com a injeção do titânio sob vácuo-pressão. Três grupos foram formados I: soldagem a laser; II: soldagem TIG, e III: sem solda. Os corpos de prova do grupo I e II foram seccionados ao meio e soldados por TIG e por laser, respectivamente; o grupo III foi mantido sem corte e sem solda, como controle. A análise metalográfica foi realizada sob aumentos de 50×, 100× e 200×, em microscópio. Resultado: Pelos resultados obtidos nas micrografias, o titânio comercialmente puro apresentou uma morfologia de grãos equiaxiais da fase α, o cordão de solda a laser apresentou estrutura martensítica e, na TIG, microestrutura Widmanstätten. Conclusão: A microestrutura martensítica é condizente com a alta taxa de resfriamento proveniente do processo de soldagem a laser. As estruturas martensítica e Widmansttäten são mais refinadas quando comparadas à microestrutura do metal base.Descritores: Soldagem em odontologia; titânio; prótese dentária; implante dentário. AbstractIntroduction: The welding method most commonly used in dentistry can not be applied to pure titanium and its alloys and its alloys due to high reactivity of titanium with the atmospheric elements must not be welded by common process. Objective: This study surveyed the characteristics of commercially pure titanium metal intact samples and those laser weld and tungsten inert gas weld. Material and method: Fifteen cylindrical rods were developments by using brass rods are patterns. The samples were invested in casings, subjected to thermal cycles, and positioned in a plasma arc-welding machine under argon atmosphere and vacuum, and titanium was injected under vacuum/ pressure. Three groups were formed I: laser welding, II, III and TIG welding, without welding. The bodies of the test piece in group I and II were cut in half and welded by TIG and laser, respectively, and group III was maintained intact as control. The metallographic analysis was performed under magnification 50×, 100× and 200× microscope. Result:The results obtained in the micrographs, the commercially pure titanium showed an equiaxed grain morphology of α phase, the laser weld bead showed martensitic structure and TIG Widmanstätten microstructure. Conclusion: Martensitic microstructure is in agreement with the high cooling rate from the laser welding process. Martensitic and Widmansttäten structures are more refined when co...

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“…For cast titanium, previous studies reported that the strength of the laser-welded specimens prepared under optimal conditions was equivalent to that of the nonwelded titanium. 9,10 Therefore, it is important to select suitable conditions for investigating the penetration depth into the dental casting alloy. This study examined the penetration depth into dental casting alloys such as CP titanium, Ti-6Al-4V, Ti-6Al-7Nb, cobalt-chromium alloy, and Type IV gold alloy under several laser welding conditions.…”

Section: Introductionmentioning

confidence: 99%