Dependence Of Stress Corrosion Cracking Of Parent Heat Affected Zone And Weld Metal Of Hsla Line Pipe Steel On Potential
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The Dependence Of Stress Corrosion Cracking Of Parent Heat Affected Zone And Weld Metal Of Hsla Line Pipe Steel On Potential
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Author :
language : en
Publisher:
Release Date : 1983
The Dependence Of Stress Corrosion Cracking Of Parent Heat Affected Zone And Weld Metal Of Hsla Line Pipe Steel On Potential written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Dependence Of Stress Corrosion Cracking Of Parent Heat Affected Zone And Weld Metal Of Hsla Line Pipe Steel On Potential
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Author : JT. Bowker
language : en
Publisher:
Release Date : 1986
Dependence Of Stress Corrosion Cracking Of Parent Heat Affected Zone And Weld Metal Of Hsla Line Pipe Steel On Potential written by JT. Bowker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Carbonates categories.
Potentiostatically controlled slow-strain-rate tension tests (~ 10-6s-1) were conducted on the parent steel, simulated heat-affected zone, and weld metal specimens obtained from a sample of Canadian grades 483 and 414 high-strength low-alloy (HSLA) line pipe. All stress corrosion cracking (SCC) tests were conducted in 0.5 mmol/cm3 Na2CO3 + 1.0 mmol/cm3 NaHCO3 solutions at 75°C in a stressed-electrode cell. Percentage reduction in area and apparent secondary cracking velocity were used as measures of SCC susceptibility. The potentials at which cracking occurred were correlated with fast and slow scan anodic potentiodynamic polarization curves in the same environment.
Corrosion Monitoring In Industrial Plants Using Nondestructive Testing And Electrochemical Methods
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Author : George C. Moran
language : en
Publisher: ASTM International
Release Date : 1986
Corrosion Monitoring In Industrial Plants Using Nondestructive Testing And Electrochemical Methods written by George C. Moran and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Corrosion and anti-corrosives categories.
Materials For Resource Recovery And Transport
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Author : Canadian Institute of Mining, Metallurgy and Petroleum
language : en
Publisher: Canadian Institute of Mining, Metallurgy and Petroleum
Release Date : 1998
Materials For Resource Recovery And Transport written by Canadian Institute of Mining, Metallurgy and Petroleum and has been published by Canadian Institute of Mining, Metallurgy and Petroleum this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Nature categories.
Canmet Catalogue Of Publications
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Author : Canada Centre for Mineral and Energy Technology
language : en
Publisher:
Release Date : 1986
Canmet Catalogue Of Publications written by Canada Centre for Mineral and Energy Technology and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Government publications categories.
Alloys Index
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Author :
language : en
Publisher:
Release Date : 1987
Alloys Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Alloys categories.
Sensitivity To Sulfide Stress Cracking At Welds In Line Pipe Steels
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Author : HJ. Cialone
language : en
Publisher:
Release Date : 1990
Sensitivity To Sulfide Stress Cracking At Welds In Line Pipe Steels written by HJ. Cialone and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Columbium carbonitrides categories.
A metallurgical investigation was undertaken to identify the factors that are responsible for sensitivity to sulfide-stress cracking (SSC) in the heat-affected zone (HAZ) of microalloyed high-strength line-pipe steels, when the HAZ does not contain regions of high hardness. Sustained-load tests were conducted in the National Association of Corrosion Engineers (NACE) laboratory sour-gas environment to determine the regions in which SSC initiated, and thereby to identify which regions were most sensitive to SSC. In every steel studied, SSC initiated in a specific region of the HAZ, usually in the region that was heated into the intercritical temperature range during welding. One steel exhibited SSC sensitivity in the region adjacent to the weld metal, which was heated above the upper critical temperature during welding, and another steel exhibited SSC sensitivity in the base metal following a laboratory normalizing heat treatment. In all of the steels that were studied, the region that exhibited sensitivity to SSC contained columbium carbonitride precipitates that were coarser than those that were present in the pipe body, which was immune to SSC as fabricated. The only steel that did not fail in the SSC experiments was not alloyed with columbium. These observations suggest that sensitivityo to SSC is related to the growth of columbium carbonitride precipitates from a size below 50 Å to a size ranging from 100 to 200 Å during welding or during some heat treatments. Thus, it should be possible to reduce sensitivity to SSC by modifying the chemical composition or the cooling rate from welding or both to suppress precipitate growth.
Metals Abstracts
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Author :
language : en
Publisher:
Release Date : 1994
Metals Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Metallurgy categories.
The Relationship Of Weld Metal Hardness Residual Stress And Susceptibility To Stress Corrosion Cracking In A Hydrogen Sulphide Environment In A 516 Gr 70 Carbon Steel Shielded Metal Arc Welded Joints
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Author : Deon Johan De Beer
language : en
Publisher:
Release Date : 2017
The Relationship Of Weld Metal Hardness Residual Stress And Susceptibility To Stress Corrosion Cracking In A Hydrogen Sulphide Environment In A 516 Gr 70 Carbon Steel Shielded Metal Arc Welded Joints written by Deon Johan De Beer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
In the petrochemical industry, carbon steels exposed to H2S environments may be susceptible to stress-corrosion cracking. A tensile residual stress and high hardness increases the risk of cracking in H2S environments. NACE SP 0472 limits weld metal hardness to 210 HV10 (200 HB) and heat-affected zone hardness to 250 HV10 to prevent stress-corrosion cracking of carbon steel welds in H2S. The hardness is controlled by the weld thermal cycle or by a post-weld heat treatment. In this project, the effect of hardness on the susceptibility to stress-corrosion cracking was investigated by increasing electrode strength systematically and measuring residual stress in the weld metal in the as-welded state. Samples were manufactured from SA 516 Gr 70, a carbon steel used extensively in the petrochemical industry. Heavily clamped plates were welded to minimise distortion and to maximise residual stress. The weld metal hardness was increased by using E6013, E7018-1, E8018-B2 and E9018-B3 electrodes without a post-weld heat treatment. Mechanical tests included all-weld and transverse tensile tests, impact strength and hardness testing. As the nominal strength of the weld metal increased, the all-weld tensile strength increased from 512 to 829 MPa, while the yield strength increased from 443 to 659 MPa. The average weld metal hardness increased from 177 to 317 HV10. The transverse tensile strength was between 511-517 MPa, while the yield strength (in the transverse direction) was between 360 and 382 MPa. Residual stresses of the welded joint were measured by neutron diffraction in the through-thickness, longitudinal and transverse direction. The Von Mises theorem evaluated the principle residual stress. Results indicate that the residual stress in the weld metal may be up to 99% of the yield strength. For stress-corrosion cracking, the samples were submerged in the standard TM0177-2005 test solution for 30 days. The only sample to crack was the E9018, with an average weld metal hardness of 317 HV10. The study results were consistent with the NACE SP0472 specification and earlier publications.
The Stress Corrosion Crack Growth Rate Of Alloy 600 Heat Affected Zones Exposed To High Purity Water
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Author : Nathan Lewis
language : en
Publisher:
Release Date : 2003
The Stress Corrosion Crack Growth Rate Of Alloy 600 Heat Affected Zones Exposed To High Purity Water written by Nathan Lewis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Grain boundary chromium carbides improve the resistance of nickel based alloys to primary water stress corrosion cracking (PWSCC). However, in weld heat affected zones (HAZ's), thermal cycles from fusion welding can solutionize beneficial grain boundary carbides, produce locally high residual stresses and strains, and promote PWSCC. The present research investigates the crack growth rate of an A600 HAZ as a function of test temperature. The A600 HAZ was fabricated by building up a gas-tungsten-arc-weld deposit of EN82H filler metal onto a mill-annealed A600 plate. Fracture mechanics based, stress corrosion crack growth rate testing was performed in high purity water between 600 F and 680 F at an initial stress intensity factor of 40 ksi {radical}in and at a constant electrochemical potential. The HAZ samples exhibited significant SCC, entirely within the HAZ at all temperatures tested. While the HAZ samples showed the same temperature dependence for SCC as the base material (HAZ: 29.8 {+-} 11.2{sub 95%} kcal/mol vs A600 Base: 35.3 {+-} 2.58{sub 95%} kcal/mol), the crack growth rates were {approx} 30X faster than the A600 base material tested at the same conditions. The increased crack growth rates of the HAZ is attributed to fewer intergranular chromium rich carbides and to increased plastic strain in the HAZ as compared to the unaffected base material.