An investigation was conducted to gain insight on the fracture resistance of carbon steels used in refinery service containing stress oriented hydrogen induced cracking (SOHIC) damage. The investigation included: (1) the development of SOHIC damage in the base metal and heat affected zone of both a conventional and “HIC Resistant” grade of ASTM A516-70 steel, (2) fracture resistance testing of the produced defects after outgassing, and (3) comparison of the data and resulting fracture surface morphologies between the two steels. The depth and character of the SOHIC attack observed on the four systems as a result of the environmental exposure indicated the base metal region of “HIC Resistant” steels to be the most susceptible, followed by the HAZ region of conventional steels. CTOD testing indicated similar toughness of the SOHIC damaged material to a conventional fatigue precracked sample in the absence of hydrogen charging. The fracture surface morphology of the SOHIC was different on the two steels and its appearance was related to differences in microstructure.

Subject
Hydrogen induced cracking, Test methods, Materials, Fracture toughness, Refineries, Cracking resistance, Base metals, Flaws, Steel, Stress oriented hydrogen induced cracking, Hydrophobic interaction chromatography, Toughness, Damage
Keywords:
fracture toughness, KIc, crack tip opening displacement, CTOD, fitness-for-service, carbon steel, hydrogen induced cracking, HIC, stress oriented hydrogen induced cracking, SOHIC
© 1997 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1997
Association for Materials Protection and Performance (AMPP)
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