The Hydrogen Disbonding test is a method for the evaluation of hydrogen induced disbonding (HID) of bimetallic stainless alloy / steel plate for use in refinery high-pressure / high-temperature gaseous hydrogen service. Bodycote Materials Testing S.r.L. of Crema, Italy has been offering this testing service for some years and is increasingly attracting business from international clients. When now available alongside extensive corrosion testing capabilities within the Bodycote Corrosion Centre, and the high temperature (creep testing, stress relaxation testing) at Bodycote Newcastle, Bodycote is offering a very comprehensive service to clients working with materials in demanding high temperature environments.
The method provides an indication of the resistance or susceptibility to HID of a metallurgically bonded stainless steel alloy surface layer on a steel substrate. It can be used to assess the effects of material composition, process methods, fabrication techniques and heat treatments as well as effects of hydrogen partial pressure, service temperature and cooling rate on the resistance or susceptibility to HID.
The test consists of exposing a coupon to a high pressure / high temperature gaseous hydrogen environment for a couple of days and then releasing hydrogen pressure at a very high rate in order to allow possible cracks at the stainless alloy / steel plate interface to grow. After exposure the presence of cracks is checked both by Ultrasonic Testing (UT) and metallurgical analysis.
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