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A method for measuring the composition of gas bubbles in metals

✍ Scribed by KT Westerduin; A van Veen; O Dankert; AA Kamperman; JJF Scheffer; H Galenkamp; J Zijp

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
340 KB
Volume
49
Category
Article
ISSN
0042-207X

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✦ Synopsis

In solidified metal, microscopic gas filled cavities may be present. They can originate from either gas bubbles in the melt or gas that has separated from the metal during solidification. A method has been developed to identify and open the cavities under vacuum and to determine the gas composition quantitatively. Having localised the cavity by ultrasonic methods and by X-ray imaging the method consists of drilling a hole to the cavity by 'vacuum drilling' equipment, and, finally, the mass-spectrometric

analysis of the released gas. An example is given of a 2.5mm sized spherical cavity in cast steel, which contained 0.4 bar of a gas mixture of Ar, N2, and HZ at room temperature.

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