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51314-4165-Metallurgical Effects on the Diffusion of Hydrogen Through Alloy 718

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Product Number: 51314-4165-SG
ISBN: 4165 2014 CP
Author: Josiah Jebaraj Johnley Muthuraj
Publication Date: 2014
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Cathodic protection is widely utilized for corrosion prevention. However hydrogen generation and incorporation at the cathodically protected metal surface followed by diffusion through the metal may cause hydrogen embrittlement and hydrogen induced stress corrosion cracking. Thus a materials susceptibility to hydrogen-induced corrosion depends upon a balance between hydrogen uptake permeation diffusion and trapping.Inconel 718 a high performance alloy often finds its application in extreme environments. Electrochemical hydrogen permeation studies were performed through Inconel 718 foils at 50 ?C in three different metallurgical conditions: cold rolled solutionized and precipitation hardened. The effective hydrogen diffusion coefficient is considerably higher (5.3-6.8x10-11 cm2/sec) for the solutionized Inconel 718 than for either the cold rolled (3.3-4.2x10-11 cm2/sec) or precipitation hardened (2.1-2.9x10-11 cm2/sec) specimens. Microstructural studies indicate that the reduced hydrogen diffusion coefficients in the latter specimens arise from hydrogen trapping at dislocations and precipitates that are present at much lower concentrations in the solutionized specimens. Repeated hydrogen permeation transients were conducted in three different metallurgical conditions to identify the role of irreversible trap sites. These results indicate that differences between hydrogen transport during the first and subsequent permeation transients provide evidence for irreversible hydrogen trapping in the cold rolled and precipitation hardened specimens but not in the solutionized specimens. 
Cathodic protection is widely utilized for corrosion prevention. However hydrogen generation and incorporation at the cathodically protected metal surface followed by diffusion through the metal may cause hydrogen embrittlement and hydrogen induced stress corrosion cracking. Thus a materials susceptibility to hydrogen-induced corrosion depends upon a balance between hydrogen uptake permeation diffusion and trapping.Inconel 718 a high performance alloy often finds its application in extreme environments. Electrochemical hydrogen permeation studies were performed through Inconel 718 foils at 50 ?C in three different metallurgical conditions: cold rolled solutionized and precipitation hardened. The effective hydrogen diffusion coefficient is considerably higher (5.3-6.8x10-11 cm2/sec) for the solutionized Inconel 718 than for either the cold rolled (3.3-4.2x10-11 cm2/sec) or precipitation hardened (2.1-2.9x10-11 cm2/sec) specimens. Microstructural studies indicate that the reduced hydrogen diffusion coefficients in the latter specimens arise from hydrogen trapping at dislocations and precipitates that are present at much lower concentrations in the solutionized specimens. Repeated hydrogen permeation transients were conducted in three different metallurgical conditions to identify the role of irreversible trap sites. These results indicate that differences between hydrogen transport during the first and subsequent permeation transients provide evidence for irreversible hydrogen trapping in the cold rolled and precipitation hardened specimens but not in the solutionized specimens. 
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03126 PHYSICAL METALLURGY OF ALLOYS 718, 725, 725HS, 925 FOR SERVICE IN AGGRESSIVE CORROSIVE ENVIRONMENTS

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Nickel-base alloys 718, 725, and 925 are commonly used in oil and natural gas production.  Being heavily alloyed multi-component systems; these materials require special consideration for processing and heat treatments.  This paper shows the effect of intergranular precipitates on mechanical properties and  slow strain rate (SSR) test results in sour oil patch environments.

 
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