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Marcelo J. Dapino - One of the best experts on this subject based on the ideXlab platform.
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fusion welding of Nickel Titanium and 304 stainless steel tubes part ii tungsten inert gas welding
Journal of Intelligent Material Systems and Structures, 2013Co-Authors: Gordon Fox, Ryan Hahnlen, Marcelo J. DapinoAbstract:Shape memory Nickel–Titanium is attractive for lightweight actuators as it can generate large blocking stresses and high recovery strains through solid-state operation. A key challenge is the integration of the Nickel–Titanium components into systems; this alloy is difficult and expensive to machine and challenging to weld to itself and other materials. In this research, we join Nickel–Titanium and 304 stainless steel tubes of 9.53 mm (0.375 in) in diameter through tungsten inert gas welding. By joining Nickel–Titanium to a common structural material that is easily machined and readily welded to other materials, the system integration challenges are greatly reduced. The joints prepared in this study were subjected to optical microscopic inspection, hardness mapping, energy dispersive X-ray spectroscopy, mechanical testing, and failure surface analysis via scanning electron microscopy. The affected zone from welding is approximately 125 µm (0.005 in) wide including partially mixed zones with a maximum hard...
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Fusion welding of Nickel–Titanium and 304 stainless steel tubes: Part II: tungsten inert gas welding
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Gordon Fox, Ryan Hahnlen, Marcelo J. DapinoAbstract:Shape memory Nickel–Titanium is attractive for lightweight actuators as it can generate large blocking stresses and high recovery strains through solid-state operation. A key challenge is the integration of the Nickel–Titanium components into systems; this alloy is difficult and expensive to machine and challenging to weld to itself and other materials. In this research, we join Nickel–Titanium and 304 stainless steel tubes of 9.53 mm (0.375 in) in diameter through tungsten inert gas welding. By joining Nickel–Titanium to a common structural material that is easily machined and readily welded to other materials, the system integration challenges are greatly reduced. The joints prepared in this study were subjected to optical microscopic inspection, hardness mapping, energy dispersive X-ray spectroscopy, mechanical testing, and failure surface analysis via scanning electron microscopy. The affected zone from welding is approximately 125 µm (0.005 in) wide including partially mixed zones with a maximum hard...
Gordon Fox - One of the best experts on this subject based on the ideXlab platform.
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fusion welding of Nickel Titanium and 304 stainless steel tubes part ii tungsten inert gas welding
Journal of Intelligent Material Systems and Structures, 2013Co-Authors: Gordon Fox, Ryan Hahnlen, Marcelo J. DapinoAbstract:Shape memory Nickel–Titanium is attractive for lightweight actuators as it can generate large blocking stresses and high recovery strains through solid-state operation. A key challenge is the integration of the Nickel–Titanium components into systems; this alloy is difficult and expensive to machine and challenging to weld to itself and other materials. In this research, we join Nickel–Titanium and 304 stainless steel tubes of 9.53 mm (0.375 in) in diameter through tungsten inert gas welding. By joining Nickel–Titanium to a common structural material that is easily machined and readily welded to other materials, the system integration challenges are greatly reduced. The joints prepared in this study were subjected to optical microscopic inspection, hardness mapping, energy dispersive X-ray spectroscopy, mechanical testing, and failure surface analysis via scanning electron microscopy. The affected zone from welding is approximately 125 µm (0.005 in) wide including partially mixed zones with a maximum hard...
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Fusion welding of Nickel–Titanium and 304 stainless steel tubes: Part II: tungsten inert gas welding
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Gordon Fox, Ryan Hahnlen, Marcelo J. DapinoAbstract:Shape memory Nickel–Titanium is attractive for lightweight actuators as it can generate large blocking stresses and high recovery strains through solid-state operation. A key challenge is the integration of the Nickel–Titanium components into systems; this alloy is difficult and expensive to machine and challenging to weld to itself and other materials. In this research, we join Nickel–Titanium and 304 stainless steel tubes of 9.53 mm (0.375 in) in diameter through tungsten inert gas welding. By joining Nickel–Titanium to a common structural material that is easily machined and readily welded to other materials, the system integration challenges are greatly reduced. The joints prepared in this study were subjected to optical microscopic inspection, hardness mapping, energy dispersive X-ray spectroscopy, mechanical testing, and failure surface analysis via scanning electron microscopy. The affected zone from welding is approximately 125 µm (0.005 in) wide including partially mixed zones with a maximum hard...
Ryan Hahnlen - One of the best experts on this subject based on the ideXlab platform.
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fusion welding of Nickel Titanium and 304 stainless steel tubes part ii tungsten inert gas welding
Journal of Intelligent Material Systems and Structures, 2013Co-Authors: Gordon Fox, Ryan Hahnlen, Marcelo J. DapinoAbstract:Shape memory Nickel–Titanium is attractive for lightweight actuators as it can generate large blocking stresses and high recovery strains through solid-state operation. A key challenge is the integration of the Nickel–Titanium components into systems; this alloy is difficult and expensive to machine and challenging to weld to itself and other materials. In this research, we join Nickel–Titanium and 304 stainless steel tubes of 9.53 mm (0.375 in) in diameter through tungsten inert gas welding. By joining Nickel–Titanium to a common structural material that is easily machined and readily welded to other materials, the system integration challenges are greatly reduced. The joints prepared in this study were subjected to optical microscopic inspection, hardness mapping, energy dispersive X-ray spectroscopy, mechanical testing, and failure surface analysis via scanning electron microscopy. The affected zone from welding is approximately 125 µm (0.005 in) wide including partially mixed zones with a maximum hard...
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Fusion welding of Nickel–Titanium and 304 stainless steel tubes: Part II: tungsten inert gas welding
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Gordon Fox, Ryan Hahnlen, Marcelo J. DapinoAbstract:Shape memory Nickel–Titanium is attractive for lightweight actuators as it can generate large blocking stresses and high recovery strains through solid-state operation. A key challenge is the integration of the Nickel–Titanium components into systems; this alloy is difficult and expensive to machine and challenging to weld to itself and other materials. In this research, we join Nickel–Titanium and 304 stainless steel tubes of 9.53 mm (0.375 in) in diameter through tungsten inert gas welding. By joining Nickel–Titanium to a common structural material that is easily machined and readily welded to other materials, the system integration challenges are greatly reduced. The joints prepared in this study were subjected to optical microscopic inspection, hardness mapping, energy dispersive X-ray spectroscopy, mechanical testing, and failure surface analysis via scanning electron microscopy. The affected zone from welding is approximately 125 µm (0.005 in) wide including partially mixed zones with a maximum hard...
T H Grentzer - One of the best experts on this subject based on the ideXlab platform.
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Temperature-modulated DSC study of phase transformations in Nickel-Titanium orthodontic wires
Thermochimica Acta, 2002Co-Authors: William A. Brantley, Masaki Iijima, T H GrentzerAbstract:Nickel-Titanium archwire alloys are very important for clinical orthodontics because of their wide elastic range and excellent springback, along with their ability to deliver highly desirable light forces for tooth movement. Recently, Nickel-4itanium orthodontic alloys have been developed that possess shape memory over the temperature range of the oral environment, and these archwires have considerable promise for the clinical treatment of patients. The shape memory is associated with a reversible transformation from martensitic NiTi to austenitic NiTi that is completed at mouth temperature. While extensive conventional differential scanning calorimetry (DSC) studies have been performed on commercial Nickel-Titanium orthodontic wire alloys to characterize their phase transformation behavior, the present study is the first time that temperature-modulated DSC (TMDSC) has been used for this purpose. Two commercial Nickel-Titanium wires possessing shape memory were analyzed, along with a third commercial Nickel-Titanium wire lacking shape memory. The TMDSC analyses were generally performed from - 130 to 100 °C for both the heating and cooling cycles, since there can be differences in the processes and the temperature ranges for the forward and reverse transformations. Improved resolution of the phase transformations was achieved with the use of TMDSC, compared to conventional DSC, and the novel results indicate the complexity of the phase transformation processes.
William A. Brantley - One of the best experts on this subject based on the ideXlab platform.
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Evolution, clinical applications, and prospects of Nickel-Titanium alloys for orthodontic purposes.
Journal of the World federation of orthodontists, 2020Co-Authors: William A. BrantleyAbstract:This review article presents an evolution of the Nickel-Titanium wires for orthodontics, following their introduction by the pioneering studies of Andreasen. The original nonsuperelastic wires were followed by the introduction of superelastic Japanese NiTi wire by Miura and colleagues and Chinese NiTi wire by Burstone and colleagues. Subsequently, new Nickel-Titanium wires with true shape memory in the oral environment were introduced. Manufacturers have marketed special heat-treated wires with variable force delivery at different positions along the archwire. Ion implantation and other surface modification techniques have been used by manufacturers to reduce in vivo Nickel release from the Nickel-Titanium wires, provide a more esthetic appearance, decrease friction, and improve corrosion resistance. The use of several research techniques to provide supporting information about the structures and transformations, mechanical properties, and clinical failure for the different types of the Nickel-Titanium wires are summarized. The evolution of the ADA/ISO standard for evaluation of these wires is also described. The closing section focuses on the use of surface modification and special coatings for the Nickel-Titanium wires, a major recent and ongoing area of active research.
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Transformation behavior of Nickel-Titanium orthodontic wires under tensile load.
Dental Materials Journal, 2011Co-Authors: Masahiro Iijima, William A. Brantley, Mitsuru Ohta, Atsuko Naganishi, Takashi Murakami, Takeshi Muguruma, Itaru MizoguchiAbstract:This study investigated transformations of Nickel-Titanium wires using differential scanning calorimetry (DSC) and thermomechanical analysis (TMA) under tensile load (100 gf or 500 gf). Two Nickel-Titanium wires, 35°C Copper Ni-Ti and Nitinol SE, were selected. DSC analyses were performed between –90° and 100°C. Specimens prepared for TMA were approximately 150 μm thick and 12 mm long. TMA analyses were performed between –120° and 100°C. With TMA, all transformation temperatures for a tensile load of 500 gf, obtained from both the heating and cooling curves, were higher than those for a tensile load of 100 gf. While mean As and Af temperatures for Copper Ni-Ti obtained by TMA were much higher than those obtained by DSC analysis, mean Ms and Mf temperatures obtained by TMA were much lower than those obtained by DSC analysis. The transformation behavior of Nickel-Titanium wires with change in temperature was affected by application of tensile load.
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Temperature-modulated DSC study of phase transformations in Nickel-Titanium orthodontic wires
Thermochimica Acta, 2002Co-Authors: William A. Brantley, Masaki Iijima, T H GrentzerAbstract:Nickel-Titanium archwire alloys are very important for clinical orthodontics because of their wide elastic range and excellent springback, along with their ability to deliver highly desirable light forces for tooth movement. Recently, Nickel-4itanium orthodontic alloys have been developed that possess shape memory over the temperature range of the oral environment, and these archwires have considerable promise for the clinical treatment of patients. The shape memory is associated with a reversible transformation from martensitic NiTi to austenitic NiTi that is completed at mouth temperature. While extensive conventional differential scanning calorimetry (DSC) studies have been performed on commercial Nickel-Titanium orthodontic wire alloys to characterize their phase transformation behavior, the present study is the first time that temperature-modulated DSC (TMDSC) has been used for this purpose. Two commercial Nickel-Titanium wires possessing shape memory were analyzed, along with a third commercial Nickel-Titanium wire lacking shape memory. The TMDSC analyses were generally performed from - 130 to 100 °C for both the heating and cooling cycles, since there can be differences in the processes and the temperature ranges for the forward and reverse transformations. Improved resolution of the phase transformations was achieved with the use of TMDSC, compared to conventional DSC, and the novel results indicate the complexity of the phase transformation processes.