Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

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

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

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.

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
$0.00
$20.00
$20.00

Surface trenching of low alloy steels in H2S-containing solutions refers to a characteristic damage morphology, somewhere between elliptical deep pits and blunt cracks. Trench occurrence has been reported after tests in sour environments in the presence of applied loads, such as constant load tests, three-and four-point bending tests, and slow strain rate tests. These features can act as crack initiation sites in sulfide stress cracking (SSC) tests for material selection and qualification, often conducted at the open circuit potential. How different material, environment and mechanical variables influence trenches formation are still under study. In this work, the effect of the electrochemical potential and stress-level on trench formation and growth are explored on Ni-bearing steels up to 5 wt.%. The results obtained herein verified the anodic nature of trench formation. Additionally, under an anodic polarization, a critical stress value for trench formation, σtrench, was estimated from slow strain rate tests and finite element modeling. The observed dependencies with the electrochemical potential and the stress-level confirmed that trenches can be considered as a form of environmental-assisted cracking.

Surface trenching of low alloy steels in H2S-containing solutions refers to a characteristic damage morphology, somewhere between elliptical deep pits and blunt cracks. Trench occurrence has been reported after tests in sour environments in the presence of applied loads, such as constant load tests, three-and four-point bending tests, and slow strain rate tests. These features can act as crack initiation sites in sulfide stress cracking (SSC) tests for material selection and qualification, often conducted at the open circuit potential. How different material, environment and mechanical variables influence trenches formation are still under study. In this work, the effect of the electrochemical potential and stress-level on trench formation and growth are explored on Ni-bearing steels up to 5 wt.%. The results obtained herein verified the anodic nature of trench formation. Additionally, under an anodic polarization, a critical stress value for trench formation, σtrench, was estimated from slow strain rate tests and finite element modeling. The observed dependencies with the electrochemical potential and the stress-level confirmed that trenches can be considered as a form of environmental-assisted cracking.

Product tags
Also Purchased
Picture for Investigations on the Microstructural Stability after Long-term High-temperature Exposure of Alloy 699 XA
Available for download

Investigations on the Microstructural Stability after Long-term High-temperature Exposure of Alloy 699 XA

Product Number: 51323-18845-SG
Author: Tatiana Hentrich, Heike Hattendorf, Sabine Bellmann, Benedikt Nowak
Publication Date: 2023
$20.00

VDM Alloy 699 XA (UNS N06699, EN Alloy number 2.4842) is a new alloy, which was developed for applications in the petrochemical industry under metal dusting conditions between 400°C and 800°C. Important properties of a new material are corrosion resistance, such as to metal dusting, oxidation resistance, and workability versus high temperature strength, which are essential for industrial applications. Currently, there are material solutions which demonstrate good metal dusting resistance, but may have issues with workability. In addition, there are also minimum requirements concerning creep resistance. It is therefore of fundamental interest, in the context of alloy design, to develop materials that has these important properties and satisfies the needs of industrial users.
Picture for 03129 OFFSHORE NICKEL ALLOY TUBING HANGER
Available for download

03129 OFFSHORE NICKEL ALLOY TUBING HANGER AND DUPLEX STAINLESS STEEL PIPING FAILURE INVESTIGATIONS

Product Number: 51300-03129-SG
ISBN: 03129 2003 CP
Author: S. Huizinga, B. McLoughlin, W.E. Liek, J.G. de Jong
$20.00
Picture for 00582 Experience With the New Ni-Cr-Mo alloy
Available for download

00582 Experience With the New Ni-Cr-Mo alloy UNS N06200 in Flue Gas Desulfurization (FGD) Systems

Product Number: 51300-00582-SG
ISBN: 00582 2000 CP
Author: Larry VanGansbeke
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support