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Variation of the Corrosion Behavior Prior to Crack

Abstract.The electrochemical process and corrosion behavior prior to crack initiation of E690 steel fatigued in simulated seawater are investigated under different cyclic stress levels by methods of electrochemical impedance spectroscopy,cyclic current response,electrochemical noiseThe effect of fretting and environment on fatigue crack Fretting fatigue studies were performed on quenched and tempered 4130 steel in laboratory air and in argon as functions of relative slip displacement,normal pressure and applied cyclic stress.Significant reductions in fatigue resistance were observed at all stress levels and increased with increasing normal pressures.However,a minimum in resistance was observed for relative slip magnitudes The Behavior of Shallow Cracks in a Pipeline Steel API 5L X65 pipeline steel parent material was tested in a sour environment with initial flaw sizes in the range 12 mm.Fatigue crack growth rate tests have been performed to investigate the influence of crack depth on crack growth rate (d a / d N) .

Some results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextInitiation and Stable Crack Growth Behavior of API X70

Initiation and Stable Crack Growth Behavior of API X70 Steel at Low Temperatures (25 crack initiation and early propagation of x70 steel in#176;C T 95 crack initiation and early propagation of x70 steel in#176;C) DC potential drop crack growth monitoring was employed to provide crack propagation data for development of the resistance curves.The temperature dependence of crack initiation and stable growth properties of this material are Some results are removed in response to a notice of local law requirement.For more information,please see here.12345NextInitiation and Stable Crack Growth Behavior of API X70 Initiation and Stable Crack Growth Behavior of API X70 Steel at Low Temperatures (25 crack initiation and early propagation of x70 steel in#176;C T 95 crack initiation and early propagation of x70 steel in#176;C) DC potential drop crack growth monitoring was employed to provide crack propagation data for development of the resistance curves.The temperature dependence of crack initiation and stable growth properties of this material are Propagation of Surface Initiated Rolling Contact Fatigue crack initiation occurred very early in total life,which was attributed to high asperity stresses due to mixed lubrication regime.Total life to pitting was dominated by crack propagation.

Pressure on Metastable Pitting Corrosion of X70

However,X70 steel is an active metal,and pitting corrosion performance of carbon steel is likely to be completely different from passive metals [21,22].In this work,hydrostatic pressure effects on pitting corrosion initiation and propagation of X70 pipeline steel were studied by evaluating metastable pitting events using electrochemical methodsPrediction of crack initiation and propagation in X70 Dec 01,2016 crack initiation and early propagation of x70 steel in#0183;The present work deals with the concept of post-initiation softening applied to ductile crack initiation and propagation problems in thick structural components such as pre-cracked pipes and fracture specimens. For early stage of crack D.P.RomillyInitiation and stable crack growth behavior of API X70 steel at low temperature (25 crack initiation and early propagation of x70 steel in#176;C Near-Neutral pH SCC Initiation and Early Propagation of The near-neutral pH SCC initiation and propagation behavior of X70 pipeline steel was investigated using dog-bone specimens with two different surface conditions,the original external pipe surface and a ground surface.The tests were conducted in NS4 solution de-aerated with N 2 /5%CO 2,under low frequency cyclic load (v = 0.1Hz,R = min / max = 0.5).The fractography shows that the

Microstructural mechanisms of cyclic deformation,fatigue

crack initiation and early propagation of x70 steel in#0183;Regarding the relative importance of the fractions of fatigue life spent during fatigue crack initiation and propagation,different conflicting opinions exist,as reflected,for example,in some early work on steel of Klesnil and later work by the late colleague Keith Miller and co-workers .Microstructural effect on near-neutral pH stress corrosion Lu BT,Luo JL (in press) Crack initiation and early propagation of X70 steel in simulated near-neutral pH groundwater.Corrosion.7.Gonzalez-Rodriguez JG,Casales M,Salinas-Bravo VM,Albarran JL,Martinez L (2002) Corrosion 58:584 A mechanistic study on mechanism of near-neutral pH stress corrosion cracking of pipeline steel,Presented in Mechanisms of Fatigue Crack Initiation and GrowthJul 02,2014 crack initiation and early propagation of x70 steel in#0183;nucleating and growing a fatigue crack to a length at which it can be detected.! The range of effective stress intensity factor,that is,the idea of crack closure allows the growth of fatigue cracks to be rationalized.! The behavior of small cracks is in many respects quite different from long cracks.

Mechanism of crack initiation and early growth of high

Jan 13,2020 crack initiation and early propagation of x70 steel in#0183;The paper suggests that the crack initiation and early growth of high strength steels is attributed to the grain refinement caused by the dislocation interaction over a number of cyclic loadings followed by micro cracks along with the formation of the micro cracks at the interior of the common grains or the grain boundaries etc (i.e.irrespective of grain refinement) during the cyclic loading.Materials Free Full-Text Hydrogen-Assisted Crack Mohtadi-Bonab et al.found crack nucleation and propagation sites caused by hydrogen in X70 steel .After crack initiation,the path of the crack propagation was found to be affected by the grain size,grain boundaries,Taylor factor,and grain orientations.Making ultrastrong steel tough by grain-boundary Jun 19,2020 crack initiation and early propagation of x70 steel in#0183;The crack-resistance (R-curve) behavior in the TD slightly rises as the crack extends,resulting in a valid crack-growth toughness of J ss = 28.7 kJm 2 at a crack extension a of ~1 mm.These fracture properties are comparable with those of the best strong-yet-tough materials,such as 18Ni 300-grade maraging steels ( 18 ,19 ) and

Low-Cycle Fatigue Properties of the X70 High-Frequency

Jan 01,2018 crack initiation and early propagation of x70 steel in#0183;However,previous studies mainly focused on the effect of microstructure on the fatigue crack propagation and the remaining life of steel and weld joint using standard fatigue test and/or numerical simulation [18,19].Fatigue processes involve crack initiation,propagationLow-Cycle Fatigue Properties of the X70 High-Frequency Jan 01,2018 crack initiation and early propagation of x70 steel in#0183;However,previous studies mainly focused on the effect of microstructure on the fatigue crack propagation and the remaining life of steel and weld joint using standard fatigue test and/or numerical simulation [18,19].Fatigue processes involve crack initiation,propagationInitiation and stable crack growth behavior of API X70 OSTI.GOV Journal Article Initiation and stable crack growth behavior of API X70 steel at low temperatures (25C [ crack initiation and early propagation of x70 steel ingt;=] T [ crack initiation and early propagation of x70 steel ingt;=] [minus]95C) Initiation and stable crack growth behavior of API X70 steel at low temperatures (25C [ crack initiation and early propagation of x70 steel ingt;=] T [ crack initiation and early propagation of x70 steel ingt;=] [minus]95C) Full Record; Other Related Research;

Initiation and stable crack growth behavior of API X70

OSTI.GOV Journal Article Initiation and stable crack growth behavior of API X70 steel at low temperatures (25C [ crack initiation and early propagation of x70 steel ingt;=] T [ crack initiation and early propagation of x70 steel ingt;=] [minus]95C) Initiation and stable crack growth behavior of API X70 steel at low temperatures (25C [ crack initiation and early propagation of x70 steel ingt;=] T [ crack initiation and early propagation of x70 steel ingt;=] [minus]95C) Full Record; Other Related Research;Initiation and growth of microcracks in high strength The specimens were fatigue tested by transverse tensile loading with a 12 to 13 Hz tension-tension profile.The loading range was from 10% to 85% of the tensile strength of the HY steel base plate and HHA weld metal respectively.Crack initiation and propagation was observed in situ using a confocal scanning laser microscope.Initiation and early crack Initiation and early crack fatigue crack initiation and short crack growth were investigated using electron microscopes.For the col d rolled stainless steels crack initiation and early growth occurred through the formation of the Fine Granular Area (FGA) observed on the fracture surface and in TEM observations of cross -sections.

Influence of pitting corrosion on fatigue and corrosion

22.Maximovich,Kobzaruk Initiation and propagation of low-cycle fatigue cracks in 15HN5DMF steel in seawater.Physical Chemical Mechanics of Materials,1985,Vol.20,No 5,pp.16-20 (in Russian) 22 23.Influence of Pitting Corrosion on Fatigue and Corrosion 22.Maximovich,Kobzaruk Initiation and propagation of low-cycle fatigue cracks in 15HN5DMF steel in seawater.Physical Chemical Mechanics of Materials,1985,Vol.20,No 5,pp.16-20 (in Russian) 22.23.Hydrogen-assisted Crack Propagation in Pre-strained Hydrogen-assisted Crack Propagation in Pre-strained Twinning-induced Plasticity Steel from Initiation at a Small Defect to Failure.Abbas Mohammadi,Motomichi Koyama, and pre-straining facilitated plasticity-driven crack initiation.The early stage of plasticity-driven crack growth was sensitive to the crack length and remote stress level

Hydrogen Induced Cracking in X70 and X52 Pipeline Steels

Crack initiation occurs when hydrogen diffuses to irreversible traps and recombines to form molecular hydrogen Crack propagation is limited by hydrogen diffusion to crack .Findley .et al.,Mat Sci and Tech,2015 {112} 7 . cracking in either X52 or X70 Fatigue crack initiation and propagation of 100Cr6 steel MATEC Web of Conferences Fatigue crack initiation and propagation of 100Cr6 steel under torsional loading in very high cycle regime Hongqian Xue 1 Tao Gao 1 Zhidan Sun 0 Xianjie Zhang 1 0 ICD ,P2MN,LASMIS ,University of Technology of Troyes,UMR 6281,CNRS ,Troyes ,France 1 Key Laboratory of Contemporary Design Integrated Manufacturing Technology of Ministry of Education,Enhancing the corrosion resistance of API 5L X70 pipeline Enhancing the corrosion resistance of API 5L X70 pipeline steel through thermomechanically controlled processing.View/ Open. and local average misorientations were analyzed in relation crack initiation and propagation.Evidence suggests that cracking occurred mainly through deformed regions in the mid-thickness section. Early onset of

Effect of electrochemical hydrogen charging on an API X70

Jun 01,2019 crack initiation and early propagation of x70 steel in#0183;2.2.Hydrogen charging test.The X70 steel samples were charged with electrochemical hydrogen charging method.The charging solution consisted of 0.2 M sulfuric acid and 3 g/l ammonium thiocyanate (NH 4 SCN).The ammonium thiocyanate was added to the solution as a recombination poison to prevent formation of hydrogen bubbles on the surface of the specimen and increase theEffect of Rolling in the Recrystallization Temperature An API 5L X70 steel (0.099 C1.664 Mn0.04 Al0.02 Ti0.258 Si (wt.%)) with a thickness of 8 mm was used in this study.The as-received steel plate had banded ferrite-pearlite with a partially recrystallized microstructure with mean grain sizes of 8 crack initiation and early propagation of x70 steel in#177; 1 m and dominant {001}//ND and -fibres as the common texture orientation during hotDETERMINATION OF FATIGUE CRACK INITIATION LIFEDetermination of fatigue crack initiation life 353 and since the plastic strain range,Ayp,controls the fatigue life,i.e.Ayp = function (N,.),equation (3) becomes da - dN = f(N,).u (4) where f is an undefined function.Equation (4) is assumed to be valid for describing the crack growth period for a crack of initial size,ai,to the critical size,a,.

Crack propagation in thick cylinders of 1/2 CrMoV steel

Because crack depths were underestimated,the law requires modification,as wet conditions prevail at the crack tip in the early stages.Keywords Crack propagation ,Quenching ,1/2 CrMoV steel ,Thermal stress ,Siriations ,Oxide dating ,Multiple cracking ,Threshold stress intensity factor ,Crack arrest ,Ductile ,Brittle materialsCrack Initiation and Early Propagation of X70 Steel in The near-neutral pH environmentally assisted cracking (EAC) initiation and propagation behavior of X70 pipeline steel was investigated in NS4 solution deaerated with N 2 /5% carbon dioxide (CO 2) under the low-frequency cyclic load.The test results show that anCrack Initiation and Early Propagation of X70 Steel in The first evidence of near-neutral pH environmentally assisted cracking (EAC) of pipeline steels was reported in 1985 in Canada.1 It possesses the transgranular cracking morphology and occurs at the external surface of pipelines in the dilute groundwater with a pH close to 6.5 containing carbon dioxide (CO2),as indicated by the liquid sample collected from the pipe surface under disbonded coating where the cracking is found.2-3 These cracks

Crack Initiation and Early Propagation of X70 Steel in

Abstract.The near-neutral pH environmentally assisted cracking (EAC) initiation and propagation behavior of X70 pipeline steel was investigated in NS4 solution deaerated with N 2 /5% carbon dioxide (CO 2) under the low-frequency cyclic load.The test results show that an increase in the applied stress level promotes the crack initiation.Cited by 18Publish Year 2006Author B.T.Lu,J.L.LuoCrack Initiation and Early Propagation of X70 Steel in Aug 01,2006 crack initiation and early propagation of x70 steel in#0183;Crack Initiation and Early Propagation of X70 Steel in Simulated Near-Neutral pH GroundwaterCited by 18Publish Year 2006Author B.T.Lu,J.L.Luo(PDF) Crack Initiation and Early Propagation of X70 Steel The crack initiation life of the X70 steel increases with decreasing applied stress level,but the crack propagation rate in early stage is essentially indepen-

Characterization of Martensite-Austenite Constituents

ICRCGHAZ by promoting the initiation and propagation of micro-cracks.However,the characteristics of the M-A constituents,i.e.,fraction,size,shape and aspect ratio,are strongly affected by the welding heat X70 steel joint geometry indicating both ID and OD bevels.(PDF) Near-Neutral pH SCC Initiation and Early Propagation PDF The near-neutral pH SCC initiation and propagation behavior of X70 pipeline steel was investigated using dog-bone specimens with two different Find,read and cite all the research you

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