Microstructural and mechanical properties of inconel 600/ZrB2-SiC joints brazed with AgCu/Cu-foam/AgCu/Ti multi-layered composite filler

Titanium/steel clad material with excellent mechanical properties and corrosion resistance has important application in the oil, gas and ocean equipment. Due to the metallurgical incompatibility of titanium and steel, the mechanical properties of weld joint would completely lose when the brittle intermetallic phase existed in the fusion welding process. Therefore, the gas tungsten arced welding (TIG) + metal inert-gas welding (MIG) + metal active-gas welding (MAG) with pure vanadium and pure copper composite filler metals for welding connection experiment in this study was carried out on Ø610mm×(14+2)mm TA1/X65 titanium/steel clad pipe fitting (titanium cladding with thickness 2 mm, X65 pipeline steel with thickness 14 mm). The microstructure, interface element distribution, main phase, microhardness distribution on cross section and mechanical properties of butt welds were researched by using OM, XRD, EDS element mapping, microhardness and tensile tests. The result showed that the use of pure vanadium and pure copper composite filler metals for welding connection could effectively avoid the production of intermetallic compounds in the process of titanium/steel composite pipe fusion welding. The deposited metal of titanium, vanadium, copper and steel had obvious zoning, the inter-diffusion melting phenomenon was not severe, which is by using solid solution phases to transit zonings of deposited metal. The microstructure of titanium and vanadium transition interface were composed of titanium-based solid solution, the microstructure of vanadium and copper transition interface was composed of vanadium-based solid solution, and the microstructure of copper and steel transition interface were composed of copper-based solid solution. The transition interface had no porosity, crack and other defects. The tensile strength of the weld was 546MPa, which is mainly contributed by the carbon steel layer. With pure vanadium and pure copper as transition filler metal for the welding connection TA1/X65 clad pipe was successfully realized by TIG+MIG+MAG welding method, and the strength index reached the desired effect.

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The non-destructive estimation of the superficial mechanical properties of components in the INCONEL 600 alloy by X-ray diffraction peak width

Surface and Coatings Technology ◽

10.1016/s0257-8972(00)00683-6 ◽

2000 ◽

Vol 130 (1) ◽

pp. 95-99 ◽

Cited By ~ 12

Author(s):

Vincent Ji ◽

Yong-Gang Zhang ◽

Chang-Qi Chen

Keyword(s):

Mechanical Properties ◽

Diffraction Peak ◽

Peak Width ◽

X Ray Diffraction ◽

X Ray ◽

Inconel 600 ◽

Inconel 600 Alloy ◽

Non Destructive ◽

Diffraction Peak Width

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Effect of Ti Content on Microstructure and Mechanical Properties of Si3N4/Si3N4 Joints Brazed with Ag-Cu-Ti+Mo Composite Filler

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.2018 ◽

2010 ◽

Vol 654-656 ◽

pp. 2018-2021

Author(s):

Jie Zhang ◽

Yan Ming He

Keyword(s):

Mechanical Properties ◽

Solid Solution ◽

Reaction Layer ◽

Joint Strength ◽

Bending Strength ◽

Si3n4 Ceramic ◽

Microstructure And Mechanical Properties ◽

Composite Filler ◽

Ti Content ◽

Solder Interface

Mo particles have been introduced into Ag-Cu-Ti brazing alloy for the joining of Si3N4 ceramic. Effects of Ti content on microstructure and mechanical properties of the joints were investigated. The results present that a compact reaction layer which is composed of TiN and Ti5Si3 was formed at the Si3N4/solder interface. The central part of the joint was composed of Ag based solid solution, Cu based solid solution, Mo particles and Cu-Ti intermetallics. By increasing Ti content in the composite filler, both the thickness of reaction layer and the amount of Cu-Ti intermetallics in the joint increased, which is beneficial for the joint strength. However, the reaction between Ti and Si3N4 proceeded more excessively. Simultaneously, more Cu-Ti intermetallics were precipitated while elevating Ti content to 6wt.%, leading to deterioration of the bonding strength. The maximum bending strength (429.4MPa) was obtained when Ti content is 4wt.% in the composite filler.

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Vacuum Brazing of GH2132 Superalloy Using BNi-2+BNi-5 Composite Filler

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.602-604.2087 ◽

2012 ◽

Vol 602-604 ◽

pp. 2087-2091

Author(s):

Rui Feng Li ◽

Zhi Shui Yu ◽

Kai Qi

Keyword(s):

Mechanical Properties ◽

Intermetallic Compound ◽

Intermetallic Compounds ◽

Solution Phase ◽

Solid Solution Phase ◽

Vacuum Brazing ◽

Vacuum Braze ◽

Brazed Joint ◽

Composite Filler ◽

Boundary Penetration

In order to overcome the over formed intermetallic compound and the grain boundary penetration phenomenon in superalloys brazed joint using BNi-2 filler, the three variable portion of BNi2+BNi-5 composite filler is used to vacuum braze GH2132 superalloy. The results showed that the addition of BNi5 filler can decrease the formation of intermetallic compounds. For composite brazing filler of BNi2+40%BNi5, the brazing seam mainly composes of solid solution phase. The amounts of intermetallic compounds increased with the increase of brazing temperature and brazing clearance. The microhardness of the intermetallic compound is about 380~400 HV which is detrimental to the mechanical properties of the brazing joint.

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Investigation of Microstructure and Mechanical Properties of Friction Stir Lap Jointed Ni Base Superalloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.724.481 ◽

2012 ◽

Vol 724 ◽

pp. 481-485

Author(s):

Kuk Hyun Song ◽

Kazuhiro Nakata

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

Friction Stir Welding ◽

Base Material ◽

Lap Joints ◽

Stir Zone ◽

Inconel 600 ◽

Friction Stir ◽

Microstructure And Mechanical Properties ◽

Average Grain Size

This study evaluated the microstructure and mechanical properties of friction stir welded lap joints. Inconel 600 and SS 400 as experimental materials were selected, and friction stir welding was carried out at tool rotation speed of 200 rpm and welding speed of 100 mm/min. Applying the friction stir welding was notably effective to reduce the grain size of the stir zone, as a result, the average grain size of Inconel 600 was reduced from 20 μm in the base material to 8.5 μm in the stir zone. Joint interface between Inconel 600 and SS 400 showed a sound weld without voids and cracks. Also, the hook, along the Inconel 600 alloy from SS 400, was formed at advancing side, which directly affected an increase in peel strength. In this study, we systematically discussed the evolution on microstructure and mechanical properties of friction stir lap jointed Inconel 600 and SS 400.

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