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07493 Progress towards understanding Mechanisms of Hydrogen Embrittlement and Stress Corrosion Cracking

Picture for 07493 Progress towards understanding Mechanisms of Hydrogen Embrittlement and Stress Corrosion Crack
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Product Number: 51300-07493-SG
ISBN: 07493 2007 CP
Author: Stan Lynch
Publication Date: 2007
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This review describes the present state of knowledge and current controversies concerning mechanisms of hydrogen embrittlement (HE), especially in steels, nickel, and titanium alloys. Mechanisms of stress-corrosion cracking (SCC) in aluminium alloys, magnesium, and other materials where hydrogen effects are involved are also discussed. HE involving the formation of brittle hydrides ahead of crack tips is only briefly described, and the main focus of the review is on mechanisms of HE and SCC when hydrides do not form. In these circumstances, there are three principal mechanisms that have significant experimental and theoretical support, viz. mechanisms based on: (i) hydrogen-enhanced localised plasticity (HELP), (ii) hydrogenenhanced decohesion (HEDE), and (iii) adsorption-induced dislocation emission (AIDE). It is concluded that combinations of these mechanisms are likely in many cases, with the dominant process depending on the fracture mode. For example, AIDE probably predominates for cleavage-like fractures and dimpled intergranular fractures, HEDE possibly occurs for some brittle intergranular fractures, and HELP contributes particularly to slip-band fractures.
This review describes the present state of knowledge and current controversies concerning mechanisms of hydrogen embrittlement (HE), especially in steels, nickel, and titanium alloys. Mechanisms of stress-corrosion cracking (SCC) in aluminium alloys, magnesium, and other materials where hydrogen effects are involved are also discussed. HE involving the formation of brittle hydrides ahead of crack tips is only briefly described, and the main focus of the review is on mechanisms of HE and SCC when hydrides do not form. In these circumstances, there are three principal mechanisms that have significant experimental and theoretical support, viz. mechanisms based on: (i) hydrogen-enhanced localised plasticity (HELP), (ii) hydrogenenhanced decohesion (HEDE), and (iii) adsorption-induced dislocation emission (AIDE). It is concluded that combinations of these mechanisms are likely in many cases, with the dominant process depending on the fracture mode. For example, AIDE probably predominates for cleavage-like fractures and dimpled intergranular fractures, HEDE possibly occurs for some brittle intergranular fractures, and HELP contributes particularly to slip-band fractures.
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Investigation of Hydrogen Embrittlement of High Strength Pipeline Steels Under Cathodic Protection

Product Number: 51317--9255-SG
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03534 EVALUATION OF HYDROGEN EMBRITTLEMENT OF S13CR STAINLESS STEELS BASED ON SSR AND CTOD TESTING

Product Number: 51300-03534-SG
ISBN: 03534 2003 CP
Author: T. Rogne, B. Nyhus, M. Svenning, H.I. Lange, O. Ørjasæter, T.G. Eggen
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SINTEF (a Norwegian research Co.) made studies of the sensitivity to hydrogen embrittlement (HE) of super 13Cr martensitic stainless steels. These tests are summarised in this paper. Both slow strain rate (SSR), 4-point-bend and fracture mechanics testing have been conducted.  The effect of temperature, cathodic protection (CP), applied potential, strain rate and H2S were investigated.
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