Skip to Main Content
ASME Press Select Proceedings

International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions

Editor
B. P. Somerday
B. P. Somerday
Search for other works by this author on:
P. Sofronis
P. Sofronis
Search for other works by this author on:
ISBN:
9780791860298
No. of Pages:
844
Publisher:
ASME Press
Publication date:
2014

The intrinsic temperature dependence of internal hydrogen assisted cracking (IHAC) of 2¼Cr-1Mo steel base plate and weld metal is measured with several fracture mechanics approaches, including a new-slotted specimen. Slow-rising displacement threshold stress intensity (KIH) increases as IHAC is eliminated with rising temperature from -50 to 125°C. Hydrogen concentration proximate to the crack tip (C), stress enhanced and microstructure trapped, provides a similitude parameter; equal KIH is produced for equal C. The C from FEA diffusion analysis decreases with decreasing-bulk H concentration and decreasing-exponential of the H-binding energy to temperature ratio for trap sites along the bainite interface crack path. IHAC is eliminated below a critical C, and thus above a critical temperature due to H detrapping. The relationship between KIH and C is predicted from a decohesion-based micromechanics model. Similitude provides the basis to predict a minimum pressurization temperature for pressure vessel operation without IHAC.

You do not currently have access to this chapter.
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal