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Contribution to the Understanding of Hydrogen Stress Cracking Initiation and Propagation in Nickel Based Alloys

This paper presents work in follow-up to the previous study. It is focused on UNS1 N07718, UNS N09925, UNS N07725 and UNS N09946. A series of incremental step load tests of compact tensile specimens were conducted to measure the fracture toughness during testing and cracking was monitored by the Electric Crack Growth Monitoring technique. A new engineering technique, referred to as statistical fractography, was used to investigate the fracture surface morphology and extract from it the fracture properties of the alloys.

Product Number: 51323-18873-SG
Author: Bruce Cowe, Flavien Vucko, Hervé Marchebois, Laurent Ponson
Publication Date: 2023
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Despite numerous studies to understand the hydrogen stress cracking behavior of precipitation hardened nickel-based alloys there is still a need for improving industry understanding. A number of data were published in a study at AMPP 2021 (paper C2021-16709) to quantify the hydrogen stress cracking resistance of high strength alloys used in subsea fastener applications. The cracking threshold of various high strength corrosion-resistant alloys was determined through successive step loading and constant load tests using cathodically polarized notched tensile specimens to simulate subsea fastener service exposure.

Despite numerous studies to understand the hydrogen stress cracking behavior of precipitation hardened nickel-based alloys there is still a need for improving industry understanding. A number of data were published in a study at AMPP 2021 (paper C2021-16709) to quantify the hydrogen stress cracking resistance of high strength alloys used in subsea fastener applications. The cracking threshold of various high strength corrosion-resistant alloys was determined through successive step loading and constant load tests using cathodically polarized notched tensile specimens to simulate subsea fastener service exposure.

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A Review Of Hydrogen Stress Cracking Of Nickel-Based Alloys For Oil And Gas Applications

Product Number: 51321-16705-SG
Author: Thierry Cassagne; Hervé Marchebois; Thiago Mesquita
Publication Date: 2021
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