| Budget Amount *help |
¥8,800,000 (Direct Cost: ¥8,800,000)
Fiscal Year 1985: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1984: ¥8,200,000 (Direct Cost: ¥8,200,000)
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| Research Abstract |
Firstly, effects of the morphology and composition of nickel-base interlayers on transient liquid phase diffusion weldability of superalloy Inconel 713C have been investigated by microscopy, electron probe microanalysis and high temperature strength tests of the joints.
Proper composition adjustment, powder refinement and homogenization of the interlayers were indicated to be both important for the improvement of the weldability. Especially in amorphous interlayers made by the rapid quenching liquid metal method, the composition homogeneity which contributes to easy homogenization of the joints was fairly improved without segregation of molybdenum and hafnium. Additionally, in case of using amorphous interlayers, the thickness of liquid layer formed at the joint interface during welding was revealed to become thinner compared with the case of using powdered interlayers, so that the isothermal solidification of the liquid phase could occur more rapidly. These phenomena were demonstrated
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to result in increasing the joint strength, and some of the jionts showed 100 percent jiont efficiency in stress-rupture tests.
Secondly, the Liquid-phase diffusion weldability and brazability of commercial pure titanium and Ti-6A1-4V alloy has been investigated by microscopy, electron probe microanalysis and tensile tests at both room and high temperatures.
In order to prevent from changing the fine base metal structures, the titanium and Ti-6A1-4V joints were made below <beta> transformation and <beta> transus temperatures respectively, by use of newly developed amorphous interlayers with low melting points, consisting of Ti, Zr, Cu and Ni.
Both joints of titanium and Ti-6A1-4V made at 850゜C for 5 minutes and at 900゜C for 10 minutes respectively, were failed in base metal without changing of the base metal structures. This shows that in case of titanium and titanium alloys, enough joints to be comparable with base metals can be made by liquid phase diffusion welding with new Ti-Zr-Cu-Ni amorphous filler metals. Less
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