AMPP Store - Products tagged with 'environmental assisted cracking'

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A Fracture Mechanics Approach To Characterizing Hydrogen Embrittlement Of Fasteners

Product Number: 51321-16798-SG

Author: Herman E. Amaya, Behrang Fahimi, Ramgopal Thodla

Publication Date: 2021

$20.00

Materials properties that are used in specific oil and gas environments are de-rated due to the risks associated with hydrogen embrittlement cracking. In oil production environments the concern is for the onset of stress corrosion cracking (SCC), while in seawater environments the concern is for Hydrogen Induced Stress Cracking (HISC). Both are hydrogen embrittlement phenomena with the distinction being the source of hydrogen for each. In SSC the source of hydrogen is from the presence of H2S in the oil production fluids, and in HISC the source of hydrogen is from the dissociation of water from the cathodic protection system. This paper is focused on the latter phenomena and aims to characterize the susceptibility of carbon alloy steels as applied in fastener applications, in a seawater environment under cathodic protection.

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Effect Of Relative Humidity And Galvanic Couples On Stress Corrosion Cracking Of High-Strength Aluminum Alloys

Product Number: 51322-18015-SG

Author: L. Agnew, B. Clark, V. Avance, F. Friedersdorf

Publication Date: 2022

$20.00

High-strength aerospace aluminum alloys, such as AA7075-T651, are susceptible to environmental assisted cracking (EAC) under the right combinations of stress, environment, and microstructure. EAC presents a serious risk to structures and equipment operated in corrosive conditions. Studies of EAC in aluminum alloys have highlighted the importance of both anodic dissolution and hydrogen embrittlement to EAC initiation and propagation.^1–4 The EAC response of alloys under variable atmospheric conditions is of particular importance for assessing material performance for aerospace applications.

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From Pits To Cracks: A Review Of 45-Years Of Published Research On Surface Trenches In Low Alloy Steels Exposed To H2S-Containing Environments

Product Number: 51322-17957-SG

Author: Dannisa R. Chalfoun, Teresa E. Perez, Mariano Iannuzzi, Mariano A. Kappes

Publication Date: 2022

$20.00

Carbon and low alloy steels (CS and LAS, respectively) used for exploration and production in the oil and gas (O&G) industry are normally exposed to environments that may contain H₂S in a wide range of concentrations. In aqueous solutions, H₂S acts as a cathodic poison.^1,2 A cathodic poison inhibits the recombination of atomic hydrogen to H₂, and as a result, favors its absorption by the metal.^1,2 In the presence of a susceptible microstructure and the simultaneous effect of applied or residual tensile stress, a crack can nucleate and propagate, when a critical concentration of hydrogen is reached in the metal.³ This environmentally assisted cracking (EAC) phenomenon is known as Sulfide Stress Cracking (SSC).² SSC is commonly addressed as a case of hydrogen embrittlement (HE) damage.²

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The Corrosion Susceptibility Index- A Physics-Based Indicator of Localized Corrosion and Environmental Assisted Cracking Susceptibility for Alloys

Product Number: 51323-19408-SG

Author: Christopher D Taylor

Publication Date: 2023

$20.00

During crack growth and localized corrosion, fresh metal surfaces become exposed to the chemical and electrochemical environment. Subsequent alteration of the material in the nascent pit or at the crack tip zone will be initiated by the surface chemical processes that template the subsequent reactivity. Quantum chemical calculations can provide a physics-based method to simulate the adsorption phenomena that occur in systems possessing multiple chemical species (such as water, chloride, hydrogen-sulfide, inhibitors, etc.), various pH levels, temperatures and electrochemical conditions.

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The Influence of Electrochemical Potential and Stress-Level on Trench Nucleation on Ni-Bearing Low Alloy Steels in Sour Environments

Product Number: 51323-19030-SG

Author: Dannisa R. Chalfoun, Mariano A. Kappes, Teresa E. Perez, Mariano Iannuzzi, José Luis Otegui, Ricardo M. Carranza

Publication Date: 2023

$20.00

The presence of trenches on low alloy steels (LAS) in sour environments at the open circuit potential (OCP) has been reported since 1977. Originally, they were classified as deep and elongated localized corrosion pits. Recently, many authors have referred to them as “stress-induced grooves.

Products tagged with 'environmental assisted cracking'

A Fracture Mechanics Approach To Characterizing Hydrogen Embrittlement Of Fasteners

Effect Of Relative Humidity And Galvanic Couples On Stress Corrosion Cracking Of High-Strength Aluminum Alloys

From Pits To Cracks: A Review Of 45-Years Of Published Research On Surface Trenches In Low Alloy Steels Exposed To H2S-Containing Environments

The Corrosion Susceptibility Index- A Physics-Based Indicator of Localized Corrosion and Environmental Assisted Cracking Susceptibility for Alloys

The Influence of Electrochemical Potential and Stress-Level on Trench Nucleation on Ni-Bearing Low Alloy Steels in Sour Environments

Association for Materials Protection and Performance