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51317--9655-The Effect of Hydrogen on Plain and Notched Test Specimens of PH Nickel Alloys

Picture for The Effect of Hydrogen on Plain and Notched Test Specimens of PH Nickel Alloys
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This paper reviews previous work and shows laboratory results using different test techniques to demonstrate the influence of yield strength and microstructure on the resistance to Hydrogen Stress Cracking of precipitation hardenable Nickel alloys N07718, N09925, N07725, N09945 and N09946.

Product Number: 51317--9655-SG
ISBN: 9655 2017 CP
Author: Stephen McCoy
Publication Date: 2017
Industry: Oil and Gas Production
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High strength Nickel alloys are widely used in subsea and downhole O&G applications for their excellent combination of mechanical properties toughness and corrosion resistance in sour environments. The trend in the O&G industry is for using higher strength materials for high pressure – high temperature service however as strength increases materials may also become more susceptible to ambient temperature failure mechanisms associated with hydrogen absorption. In recent years resistance to Hydrogen Stress Cracking (HSC) and Hydrogen Embrittlement as well as sour corrosion resistance have become of increasing interest to the industry due to a number of reported failures of high strength precipitation hardened Nickel alloy grades used in completion tools. The failures of the materials have been attributed to unfavourable microstructures increasing their susceptibility to HSC. A number of factors are known to influence HSC and this paper reviews previous work and shows laboratory results using different test techniques to demonstrate the influence of yield strength and microstructure on the resistance to HSC of precipitation hardenable Nickel alloys N07718 N09925 N07725 N09945 and N09946. Tests have been conducted in Hydrogen charging environments while conducting a slow strain rate test with plain and notched specimens and also by pre-charging tensile samples and assessing the effect of hydrogen absorption on the materials’ ductility. The resistance of the Nickel alloys to HSC is correlated with material microstructure and mechanical properties and the effect of notch stress concentrations on the performance of the materials in a hydrogen charged environment.

Key words: Nickel alloys, Hydrogen Stress Cracking, Hydrogen Embrittlement, Oil & Gas downhole equipment, Slow Strain Rate Testing

High strength Nickel alloys are widely used in subsea and downhole O&G applications for their excellent combination of mechanical properties toughness and corrosion resistance in sour environments. The trend in the O&G industry is for using higher strength materials for high pressure – high temperature service however as strength increases materials may also become more susceptible to ambient temperature failure mechanisms associated with hydrogen absorption. In recent years resistance to Hydrogen Stress Cracking (HSC) and Hydrogen Embrittlement as well as sour corrosion resistance have become of increasing interest to the industry due to a number of reported failures of high strength precipitation hardened Nickel alloy grades used in completion tools. The failures of the materials have been attributed to unfavourable microstructures increasing their susceptibility to HSC. A number of factors are known to influence HSC and this paper reviews previous work and shows laboratory results using different test techniques to demonstrate the influence of yield strength and microstructure on the resistance to HSC of precipitation hardenable Nickel alloys N07718 N09925 N07725 N09945 and N09946. Tests have been conducted in Hydrogen charging environments while conducting a slow strain rate test with plain and notched specimens and also by pre-charging tensile samples and assessing the effect of hydrogen absorption on the materials’ ductility. The resistance of the Nickel alloys to HSC is correlated with material microstructure and mechanical properties and the effect of notch stress concentrations on the performance of the materials in a hydrogen charged environment.

Key words: Nickel alloys, Hydrogen Stress Cracking, Hydrogen Embrittlement, Oil & Gas downhole equipment, Slow Strain Rate Testing

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