Friction Welding Characteristics of TiAl Intermetallic Compound

Miyashita, Tetsuya; Hino, Haruki

doi:10.2320/jinstmet1952.58.2_215

Cited by 12 publications

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“…This indicates that the joint is difficult to have stable diffusion barrier layer consisting only of the TiC due to contribution of Al element to the interfacial reaction. (2) The joint bonded at 1073 K for 3.6 ks has the highest bonding strength of 160 MPa and is expected to be located in a practical level. However, the strength dramatically decreases with increasing bonding temperature.…”

Section: Discussionmentioning

confidence: 99%

“…The TiAl has been bonded to itself, [1][2][3][4][5][6][7] ceramics 8) and high melting point metals 9) on the assumption of high temperature applications, while steel has been also selected as a combinatorial companion due to its extensive use. 10,11) These joining have been achieved by diffusion bonding including the use of metal insert and superplastic deformation, 1,3,4,[6][7][8][9]11) brazing, 10) friction welding 2) and electron beam welding. 5) In each case, control of interfacial reaction, thermal stress and defects such as void and oxide film is important to the sound joint.…”

Section: Introductionmentioning

confidence: 99%

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Diffusion Bonding of TiAl Alloy to Eutectoid Steel and its Interfacial Self-destruction Behavior

et al. 2004

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Interfacial microstructures and bonding strength of TiAl alloy/eutectoid steel joints have been investigated from the viewpoint of diffusion barrier effect of carbide layer formed at the interface. Diffusion bonding was performed at 1073 to 1273 K for 3.6 ks in a vacuum, and then several specimens were heated at 1073 to 1273 K for 10.8 to 86.4 ks in evacuated quartz tube to examine the growth behavior of reaction layer. The joint has essentially four kinds of the reaction layers. They are composed of two layers with Ti, Al and Fe elements, TiC layer containing FeAl compounds and ferrite layer. This indicates that the joint is difficult to have stable diffusion barrier layer consisting only of the TiC due to contribution of Al element to the interfacial reaction. Although the joint bonded at 1073 K shows high bonding strength of 160 MPa, the strength dramatically decreases with increasing bonding temperature. In addition, self-destruction phenomenon is recognized at the interface in the joints heat-treated at 1173 and 1273 K, and the origin is also discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diffusion Bonding of TiAl Alloy to Eutectoid Steel and its Interfacial Self-destruction Behavior

et al. 2004

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“…To encourage the effective use of these materials, they have been joined to themselves and other materials by various joining methods, such as diffusion bonding, 1,2) brazing, 3) friction welding, 4) and electron beam welding. 5) The authors have previously investigated the interfacial microstructures and the bonding strengths of Ti-Al alloy/iron material joints produced by diffusion bonding, [6][7][8][9] because steel is a dominant structural material in industrial products.…”

Section: Introductionmentioning

confidence: 99%

Bonding and Separation between Ti-15 mol% Sn Alloy and Iron Materials

Morizono

Nakatsukasa

2014

ISIJ Int.

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Diffusion bonding of Ti-15 mol% Sn alloy to various iron materials was carried out in the temperature range of 1 073-1 273 K for 0.9-14.4 ks in a vacuum to verify interface separation, a phenomenon that has been observed between Ti-20 mol% Al alloy and high-carbon steel after bonding treatment at 1 273 K for 3.6 ks. Four types of carbon steel and one type of cast iron were used as an opposite material for the Ti-15 mol% Sn alloy. In the case of steel having a relatively low carbon content, a sound joint without defects like a gap at the interface was obtained through bonding treatment at 1 273 K for 3.6 ks. However, the joints with high-carbon steel and cast iron, which were fabricated at 1 273 K for 3.6 ks, had gaps at the interfaces, and several specimens separated near the interface promptly after bonding treatment. The separated surfaces of the high-carbon steel and cast iron were relatively smooth. A microstructure corresponding to the grain boundary and pearlite was observed in the surfaces. It was found that this phenomenon depended on the heating temperature and the holding time. These features were consistent with those of interface separation previously reported in the case of Ti-20 mol% Al alloy. Therefore, it is concluded that the separation phenomenon was caused by interdiffusion across the interface between the titanium alloy and the iron material.

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“…In press welding of γ-TiAl intermetallic alloy [9], welded joints feature a low strength because of formation of brittle stringers in the joint zone. The main problems in producing sound joints of titanium aluminides in friction welding [10,11] is microcracking in the thermomechanical impact zone (TMIZ) during deformation and at cooling. At vacuum diffusion welding (VDW) of Ti-48Al-2Nb-2Mn alloy the interface is clearly defined and defects in the form of micropores are observed in the transition zone structure [12].…”

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confidence: 99%

Structure of gamma-tial joints in resistance butt welding with application of interlayers

Kuchuk-Yatsenko¹,

Zyakhor²,

Chernobaj³

et al. 2015

The Paton Welding J.

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The paper deals with the features of producing joints of an alloy based on γ-TiAl intermetallics at resistance butt welding with application of interlayers in the form of foil, differing by thickness, composition and structural state. Investigations were performed on samples of Ti-47Al-2Cr-2Nb (at.%) alloy, produced by electron beam remelting, both in as-delivered (cast) condition, and after heat treatment (1250 °C, 6 h). Used as interlayer was titanium foil with microcrystalline structure 100, 200 and 400 μm thick, and nanostructured multilayered foils Ti/Al (52Ti-48Al, at.%) and Ti/Co (75Ti-25Co, at.%) of 30-160 μm thickness. Experiments were performed in K802 system, welding mode parameters were varied in the following ranges: 5-20 MPa pressure at heating, 20-100 MPa upset pressure, hand 5-15 mm upset value. Joint microstructure and composition were studied by optical and scanning electron microscopy and X-ray microprobe analysis. Metal strength properties in the joint zone were assessed by microhardness distribution and rupture testing. It is established that the zone of Ti-47Al-2Cr-2Nb alloy joints made with application of solid titanium foil demonstrates structural inhomogeneity in the form of a continuous titanium interlayer and diffusion zone between the interlayer and alloy being welded, containing linear porosity. Application of nanostructured Ti/Al and Ti/Co foils ensures formation of defect-free joints. Metal structure in the joint zone is fine-grained bimodal γ/γ + α2, irrespective of base metal initial structure. Remains of nanostructured foils of Ti/Al system are present in the joint zone in the form of an interlayer of dispersed γ-TiAl intermetallic, not containing any chromium or niobium. At application of foil of Ti/Co system of eutectic composition, no chemical inhomogeneity in the form of foil transformation products is found in the butt. At rupture testing of the joints, fracture runs through the base metal of Ti-47Al-2Cr-2Nb alloy. Joint region of higher hardness in all the considered cases coincides with the zone of structural changes resulting from thermodeformational impact of the welding process. 21 Ref., 11 Figures.

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Friction Welding Characteristics of TiAl Intermetallic Compound

Cited by 12 publications

References 0 publications

Diffusion Bonding of TiAl Alloy to Eutectoid Steel and its Interfacial Self-destruction Behavior

Diffusion Bonding of TiAl Alloy to Eutectoid Steel and its Interfacial Self-destruction Behavior

Bonding and Separation between Ti-15 mol% Sn Alloy and Iron Materials

Structure of gamma-tial joints in resistance butt welding with application of interlayers

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