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97525 AN EXPLORATORY EXAMINATION OF THE EFFECT OF SOHIC DAMAGE ON THE FRACTURE RESISTANCE OF CARBON STEELS

Product Number: 51300-97525-SG
ISBN: 97525 1997 CP
Author: D.L. Cooke, M.S. Cayard, R.D. Kane
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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 roller 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. Keywords: fracture toughness, Kic, crack tip opening displacement, CTOD, fitness-for-service, carbon steel, hydrogen induced cracking, HIC, stress oriented hydrogen induced cracking, SOHIC,suliide stress cracking, SSC, sour service, hydrogen sulfide, H2S

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 roller 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. Keywords: fracture toughness, Kic, crack tip opening displacement, CTOD, fitness-for-service, carbon steel, hydrogen induced cracking, HIC, stress oriented hydrogen induced cracking, SOHIC,suliide stress cracking, SSC, sour service, hydrogen sulfide, H2S

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