Menu
Search
Filters
Close
Menu

51318-11439-Evaluation of resistance to cracking for HIPed and rolled duplex stainless steel microstructures

Picture for Evaluation of resistance to cracking for HIPed and rolled duplex stainless steel microstructures
Available for download

This work aims to evaluate and compare the resistance to HISC for two types of DSS products with different microstructures: rolled and hot isostatically-pressed (HIPed), using the conventional fracture toughness test methods.

Product Number: 51318-11439-SG
Author: Lisa Blanchard / Hongbiao Dong / Kasra Sotoudeh
Publication Date: 2018
Industry: Oil and Gas Production
$0.00
$20.00
$20.00

Austenitic-ferritic (super)duplex stainless steels, (S)DSSs, are of particular interest in oil and gas applications, due to their combination of high strength and corrosion resistance. However, (S)DSSs are known to be susceptible to hydrogen embrittlement, via a mechanism commonly referred to as hydrogen-induced stress cracking (HISC). In subsea environments, (S)DSS components are often exposed to cathodic protection (CP), which is mainly applied to protect structural steel components, to which (S)DSS components are connected. CP can introduce hydrogen to metallic surfaces that are exposed to seawater and, in the case of (S)DSSs, the absorbed hydrogen can cause embrittlement via HISC, which has been found to be responsible for a number of subsea failures.

During failure investigations of (S)DSS components, it has been observed that the microstructure, i.e. as manifested by the size, spacing and distribution of the austenite, ferrite and chromium nitride precipitates, obtained by various manufacturing and fabrication processes, is a key factor in resistance to HISC. However, because of the complexity of (S)DSS microstructures, the micro-mechanisms of hydrogen embrittlement have remained largely unknown. This work aims to evaluate and compare the resistance to HISC for two types of DSS products with significantly different microstructures: rolled and hot isostatically-pressed (HIPed), using the conventional fracture toughness test methods, i.e. unloading compliance testing of single edge notched bend specimens (SENBs). The two materials have been characterized in terms of composition, phase balance, austenite spacing and mechanical properties. An environmental-mechanical test program, largely based on fracture toughness testing, has been developed and performed to investigate the effect and significance of specimens’ notch geometry, as well as hydrogen-charging conditions, highlighting the difficulties of evaluation of resistance to cracking of DSSs, using fracture toughness based tests in hydrogen-charging environments.

Key words: Duplex stainless steels, hydrogen-induced stress cracking, environmental testing, hot isostatically-pressed microstructure, rolled microstructure, fracture toughness testing, R-curves.

Austenitic-ferritic (super)duplex stainless steels, (S)DSSs, are of particular interest in oil and gas applications, due to their combination of high strength and corrosion resistance. However, (S)DSSs are known to be susceptible to hydrogen embrittlement, via a mechanism commonly referred to as hydrogen-induced stress cracking (HISC). In subsea environments, (S)DSS components are often exposed to cathodic protection (CP), which is mainly applied to protect structural steel components, to which (S)DSS components are connected. CP can introduce hydrogen to metallic surfaces that are exposed to seawater and, in the case of (S)DSSs, the absorbed hydrogen can cause embrittlement via HISC, which has been found to be responsible for a number of subsea failures.

During failure investigations of (S)DSS components, it has been observed that the microstructure, i.e. as manifested by the size, spacing and distribution of the austenite, ferrite and chromium nitride precipitates, obtained by various manufacturing and fabrication processes, is a key factor in resistance to HISC. However, because of the complexity of (S)DSS microstructures, the micro-mechanisms of hydrogen embrittlement have remained largely unknown. This work aims to evaluate and compare the resistance to HISC for two types of DSS products with significantly different microstructures: rolled and hot isostatically-pressed (HIPed), using the conventional fracture toughness test methods, i.e. unloading compliance testing of single edge notched bend specimens (SENBs). The two materials have been characterized in terms of composition, phase balance, austenite spacing and mechanical properties. An environmental-mechanical test program, largely based on fracture toughness testing, has been developed and performed to investigate the effect and significance of specimens’ notch geometry, as well as hydrogen-charging conditions, highlighting the difficulties of evaluation of resistance to cracking of DSSs, using fracture toughness based tests in hydrogen-charging environments.

Key words: Duplex stainless steels, hydrogen-induced stress cracking, environmental testing, hot isostatically-pressed microstructure, rolled microstructure, fracture toughness testing, R-curves.

Product tags
Also Purchased
Picture for EVALUATION OF THE STRESS CORROSION CRACKING OF DIFFERENT CRAS IN SOUR WELL ENVIRONMENT.
Available for download

51318-11450-EVALUATION OF THE STRESS CORROSION CRACKING OF DIFFERENT CRAS IN SOUR WELL ENVIRONMENT.

Product Number: 51318-11450-SG
Author: P.Esteban / Alejandra López / B.Calleja
Publication Date: 2018
$20.00

This paper shows the results of the stress corrosion cracking evaluation of two different austenitic corrosion resistant alloys (CRAs), N08028 and N08825 under different conditions of temperature and pressure of H2S and CO2.
Picture for Stress corrosion cracking behaviour of Ni-based welding Alloys 182 and 152 in PWR primary water environment
Available for download

51318-11444-Stress corrosion cracking behaviour of Ni-based welding Alloys 182 and 152 in PWR primary water environment

Product Number: 51318-11444-SG
Author: Yun Soo Lim / Seong Sik Hwang / Sung Woo Kim / Hong Pyo Kim
Publication Date: 2018
$20.00

Primary water stress corrosion cracking (PWSCC) testing of Alloy 182 and 152 welds was conducted using 1/2 compact tension specimens at 325 ℃ in simulated primary water environments of a pressurized water reactor.
Picture for Electrochemical Methods for Assessing the Pitting Corrosion Resistance of Metallic Materials
Available for download

51318-11438-Electrochemical Methods for Assessing the Pitting Corrosion Resistance of Metallic Materials

Product Number: 51318-11438-SG
Author: Helmuth Sarmiento Klapper / Sebastian Jesse / Andreas Heyn
Publication Date: 2018
$20.00

Assessing pitting corrosion resistance of metallic materials in chloride-containing environments at elevated temperature…based on electrochemical results obtained on two materials in oilfield upstream applications.
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