hydrogen diffusion and trapping in a 42crmo4 quenched

hydrogen diffusion and trapping in a 42crmo4 quenched

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(PDF) Infusion of hydrogen into nanostructured bainitic steel

A 42CrMo4 steel quenched and tempered at different temperatures was tested via a combination of electrochemical hydrogen transient build-up permeation tests and thermal desorption analysisAuthor A.Zafra,L.B.Peral,J.BelzuncePublish Year 2020Hydrogen diffusion and trapping in 42CrMo4 quenched and Nov 15,2020·In this context,the present paper aims to study hydrogen diffusion and trapping in a quenched and tempered 42CrMo4 steel by means of electrochemical permeation methods.The effect of quenching from a high austenitizing temperature and applying a plastic deformation of 10% and 20%,were also evaluated.Author A.Zafra,L.B.Peral,J.BelzuncePublish Year 2020Hydrogen diffusion and trapping in A 42CrMo4 quenchedIn this context,the present paper aims to study hydrogen diffusion and trapping in a quenched and tempered 42CrMo4 steel by means of electrochemical permeation methods.The effect of quenching

Cited by 11Publish Year 2018Author Emilie Van den Eeckhout,Tom Depover,Kim VerbekenMobility and trapping of hydrogen in high-strength steel

techniques to study hydrogen mobility and trapping [69].The first one informs us about the diffusion coefficient and the content of trapped hydrogen,and the second one gives access to the trapping energy.These methods are applied to a quenched-tempered martensitic steel S690QL in order to develop a model of diffusion/trappingCited by 1Publish Year 2013Author Flavien Vucko,Asdin Aoufi,Cédric Bosch,David DelafosseQuantification of hydrogen trapping in multiphase steels We quantified systematically the H trap density in martensite resulting from the presence of dislocations,grain boundaries and retained austenite through a combination of detailed microstructural characterisation,H permeation,thermal desorption and diffusion modelling.This thorough analysis allowed for the first time to deconvolve key microstructural constituents affecting H diffusion in Cited by 27Publish Year 2004Author A.M.Brass,F.Guillon,S.VivetHydrogen Permeation Transient in Quenched andMetals 2018,8,779 4 of 13 Hydrogen Electrode).Dapp was calculated using the hydrogen oxidation current in combination with following formula Dapp = L2 7.7t [m2 s 1] (2) where Dapp is the apparent diffusion coefcient (m2/s),t the time (s) when the normalized steady-state value has reached a value of 0.1 and L the specimen thickness (m),which was about 1 mm.

Cited by 2Publish Year 2020Author A.Zafra,J.Belzunce,C.RodríguezEffect of hydrogen on the tensile properties of 42CrMo4

e SEM microstructures of 42CrMo4 steel,quenched and tempered at (a) 500 C,(b) 550 C,(c) 600 C,(d) 650 C,(e) 700 C and f) Quenched and non-tempered. Hydrogen diffusion and trapping in A Cited by 2Publish Year 2020Author A.Zafra,J.Belzunce,C.RodríguezHydrogen diffusion and trapping in A 42CrMo4 quenchedDislocations constitute the governing hydrogen trap in martensitic 42CrMo4 steel. The diffusion coefficient depends on the steel hydrogen concentration. Hydrogen diffusivity increases when increasing the tempering temperature. Applying a high tempering temperature decreases hydrogen trapCited by 3Publish Year 2017Author Jin Ho Park,Min-suk Oh,Sung Jin KimEffect of surface modification,microstructure,and Cathodic protection is widely used for corrosion prevention.However,this process generates hydrogen at the protected metal surface,and diffusion of hydrogen through the metal may cause hydrogen embrittlement or hydrogen induced stress corrosion cracking.Thus the choice of a metal for use as fasteners depends upon its hydrogen uptake,permeation,diffusivity and trapping.The diffusivity of

Cited by 5Publish Year 2020Author Andrej Turk,Gaurav R.Joshi,Marius Gintalas,Mauro Callisti,Pedro E.J.Rivera-Díaz-del-Castillo,Steely Hydrogen Proceedings

P14 - Hydrogen Embrittlement study of X4CrNiMo 16.5.1 martensitic stainless steel and its weld use of standard disk pressure tests P15 - Effect of hydrogen on the tensile properties of 42CrMo4 steel quenched and tempered at different temperaturesCited by 94Publish Year 2016Author Qinglong Liu,Jeffrey Venezuela,Mingxing Zhang,Qingjun Zhou,Andrej AtrensEffect of hydrogen on the tensile properties of 42CrMo4 Abstract The influence of hydrogen on the mechanical behaviour of a 42CrMo4 tempered martensitic steel was investigated by means of tensile tests on both smooth and circumferentially-notched round-bar specimens pre-charged with gaseous hydrogen in a pressurized reactor.Hydrogen solubility was seen to decrease with increasing tempering temperature.Cited by 94Publish Year 2016Author Qinglong Liu,Jeffrey Venezuela,Mingxing Zhang,Qingjun Zhou,Andrej AtrensQuantification of Hydrogen Diffusion and Trapping in 2 microstructure on hydrogen diffusion and trapping,because it is well established that hydrogen transport and uptake are strongly dependent on hydrogen trapping[15] at microstructural defects,e.g.,carbide interfaces and nonmetallic particles in ferritic steels.

Effect of bainite in microstructure on hydrogen diffusion

The transport of hydrogen atom in the steel can be classified into 3 kinds of category; interstitial lattice diffusion,reversible trapping,and irreversible trapping.10 Reference Huang,Nakajima,Nishikata and Tsuru 12 As a result of complex interaction among hydrogen atom,trapping site and microstructure of matrix,the steel can be susceptible to HAC failure.Effect of quenching temperature on sulfide stress cracking Abstract A medium-carbon Cr-Mo-V martensitic steel was quenched at a decreased temperature from 1200° to 900°C and tempered at an identical temperature of 700 °C,thus provided with an enhanced KISSC value.The effect of quenching temperature,Tq,on the sulfide stress cracking (SSC) behaviors was estimated via the double cantilever beam (DCB) and the electrochemical hydrogen permeation HYDROGEN DEGRADATION OF STEEL-DIFFUSION ANDhydrogen reaching the exit side increases and reaches a steady-state with time.Time tb and the area under the curve is representative of the metals characteristics.Fig.1.Crack advance Vs temperature in AISI 4130 [2] Fig.2.Hydrogen diffusion curve [5] Hydrogen diffusion obeys Ficks first law

Hydrogen Diffusion and Microstructure in Undoped and

Consequently,as the microvoid density increases beyond a critical density (corresponding to N_ {rm d} >= 6.5 at.%) hydrogen diffusion is totally quenched.The diffusion results are discussed both in the context of multiple trapping transport of hydrogen in an exponential distribution of trapping sites and the floating bond model.Hydrogen Permeation in X65 Steel under Cyclic Loading This experimental work analyzes the hydrogen embrittlement mechanism in quenched and tempered low-alloyed steels.Experimental tests were performed to study hydrogen diffusion under applied cyclic loading.The permeation curves were fitted by considering literature models in order to evaluate the role of trappingboth reversible and irreversibleon the diffusion mechanism.Hydrogen Permeation in X65 Steel under Cyclic LoadingThis experimental work analyzes the hydrogen embrittlement mechanism in quenched and tempered low-alloyed steels.Experimental tests were performed to study hydrogen diffusion under applied cyclic loading.The permeation curves were fitted by considering literature models in order to evaluate the ro

Hydrogen diffusion and trapping IN 42CrMo4 quenched and

Request PDF Hydrogen diffusion and trapping IN 42CrMo4 quenched and tempered steel Influence of quenching temperature and plastic deformation Medium- and high-strength steel components Hydrogen diffusion and trapping in 42CrMo4 quenched and Hydrogen diffusion and trapping in 42CrMo4 quenched and tempered steel Influence of quenching temperature and plastic deformationHydrogen diffusion and trapping in 42CrMo4 quenched and Hydrogen diffusion and trapping in 42CrMo4 quenched and tempered steel Influence of quenching temperature and plastic deformation dc.contributor.author Zafra García,Alfredo Manuel

Hydrogen diffusion and trapping in A 42CrMo4 quenched

Nov 06,2020·A 42CrMo4 steel quenched and tempered at different temperatures was tested via a combination of electrochemical hydrogen transient build-up permeation tests and thermal desorption analysis (TDA).The evolution of the apparent diffusion coefficient,D app,versus the applied cathodic current density as microstructural hydrogen traps are progressively filled,was obtained until reaching the value of the lattice diffusion coefficient,D L (hydrogen diffusion in the steel when all its trapsHydrogen trapping in some advanced high strength steels Oct 01,2016·Hydrogen trapping.Hydrogen diffusion is often studied using the permeation technique of Devanathan and Stachurski .This permeation method can provide quantitative information,such as the effective hydrogen diffusion coefficient,D eff,the hydrogen concentration,C H,and the hydrogen trapping site density.This permeation technique was used in the present research to study hydrogen diffusion and trappingHydrogen trapping in some advanced high strength steelshydrogen trapping site density.This permeation technique was used in the present research to study hydrogen diffusion and trapping in DP and QP AHSS.Hydrogen atoms are located in interstitial sites and are trapped by microstructure features such as voids,dislocations,grain boundaries,carbide interfaces,and impurities [16-18].

III.17 Hydrogen Permeability and Integrity of Steel Welds

high-pressure hydrogen delivery pipeline presents some unique issues that are seldom addressed in the past.At the center of these issues is the hydrogen transport behavior in metal the absorption,diffusion,and trapping of hydrogen in metal.At the present time,very limited knowledge is available about the rate of diffusionL.B.Peral's research works University of Oviedo,Oviedo A 42CrMo4 steel quenched and tempered at different temperatures was tested via a combination of electrochemical hydrogen transient build-up permeation tests and thermal desorption analysisPalladium coating on quenched-tempered martensiticDL is the true lattice diffusion coefficient without effects of trapping.The diffusion coefficient is constant in the coating and no trapping occurs.The boundary condition at entry side is constant hydrogen concentration C0=15 mol.m-3(1.9 wppm) and C=0 at exit side.The trapping is simulated with a trap density NT= 50 mol.m

Precipitation and trapping of hydrogen in steel The

Aug 20,2006·Copper samples containing dissolved hydrogen up to a few hundred atomic p.p.m.have been prepared by quenching from equilibrium at higher temperatures.Measurements of the annealing of the residual resistivity up to 150°C show that the hydrogen precipitates around room temperature and the precipitation is controlled by diffusion of the hydrogen.Some results are removed in response to a notice of local law requirement.For more information,please see here.12345NextStudy of the hydrogen diffusion and segregation into FeAn electrochemical permeation technique was used to study the hydrogen diffusion and trapping in a Fe-0.45%wt C-1.5%wt Mo quenched and tempered martensitic steel.The material was electro eroded to obtain disks of 25mm diameter and of 1.2mm initial thickness.

Technical Reference on Hydrogen Compatibility of

diffusivity of hydrogen through the metal by analysis of transport transients.Solubility is the ratio of permeability and diffusivity (Ref.[17] provides some background on the thermodynamic origin of the relationships between permeation,diffusion and equilibrium dissolution),thus hydrogen solubility can be determined accordingly.Thermal desorption analysis for hydrogen trapping in Mar 20,2017·The higher carbon content in the quenched and tempered steel led to a higher interaction between hydrogen and iron carbide,specifically in the martensitic phase.Furthermore,the trapping behavior in heat-affected zones showed a significant increase in activation energy,especially in the coarse-grained microstructure.



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