Effect of hydrogen on fracture toughness properties of a pipeline steel under simulated sour service conditions

Chatzidouros, E.V.; Traidia, A.; Devarapalli, Rajakumar; Pantelis, D.I.; Steriotis, Theodore; Jouiad, Mustapha

doi:10.1016/j.ijhydene.2018.01.186

Cited by 55 publications

(19 citation statements)

References 38 publications

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“…Both hydrogen pressure and external load were characterized by stress intensity factors. For the linear elasticity model, the driving force can be expressed by Equation (4), and the elastoplastic model can be expressed by Equation (7). blue balls represent hydrogen atoms, the red balls represent iron atoms, and "DSC" indicates the dense surface of the crystal.…”

Section: Criterion Of Hic Formationmentioning

confidence: 99%

“…The right side of Equation (11) indicates the material resistance to crack propagation, i.e., the fracture toughness with hydrogen: KIC(H). It has been proved through many experiments that the fracture toughness is reduced by hydrogen [7,8].…”

Section: Criterion Of Hic Formationmentioning

confidence: 99%

“…First, according to the modification of the Griffith criterion from Orowan's assumption, as indicated by Equation (12), the fracture toughness is determined by the surface energy and plastic properties: The right side of Equation (11) indicates the material resistance to crack propagation, i.e., the fracture toughness with hydrogen: K IC (H). It has been proved through many experiments that the fracture toughness is reduced by hydrogen [7,8].…”

Section: Fracture Toughness With Hydrogenmentioning

confidence: 99%

“…The fracture toughness (K Q ) of pipeline steel under simulated sour service conditions was moderately decreased by adding hydrogen, and the crack tip opening displacement (CTOD 0 ) significantly decreased with the increase in the hydrogen concentration [7]. For ultrahigh-strength AerMet100 steel, the threshold stress intensity for critical HIC (K TH ) can be as low as 10% of the plane-strain fracture toughness without hydrogen (K IC ), with a fracture-mode transition from microvoid coalescence (MVC) to brittle transgranular (TG) cracking, apparently along martensite lath interfaces and cleavage planes [8].…”

Section: Introductionmentioning

confidence: 99%

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Formation Criterion of Hydrogen-Induced Cracking in Steel Based on Fracture Mechanics

Fang

2018

Metals

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A new criterion for hydrogen-induced cracking (HIC) that includes both the embrittlement effect and the loading effect of hydrogen was obtained theoretically. The surface cohesive energy and plastic deformation energy are reduced by hydrogen atoms at the interface; thus, the fracture toughness is reduced according to fracture mechanics theory. Both the pressure effect and the embrittlement effect mitigate the critical condition required for crack instability extension. During the crack instability expansion, the hydrogen in the material can be divided into two categories: hydrogen atoms surrounding the crack and hydrogen molecules in the crack cavity. The loading effect of hydrogen was verified by experiments, and the characterization methods for the stress intensity factor under hydrogen pressure in a linear elastic model and an elastoplastic model were analyzed using the finite-element simulation method. The hydrogen pressure due to the aggregation of hydrogen molecules inside the crack cavity regularly contributed to the stress intensity factor. The embrittlement of hydrogen was verified by electrolytic charging hydrogen experiments. According to the change in the atomic distribution during crack propagation in a molecular dynamics simulation, the transition from ductile to brittle fracture and the reduction in the fracture toughness were due to the formation of crack tip dislocation regions suppressed by hydrogen. The HIC formation mechanism is both the driving force of crack propagation due to the hydrogen gas pressure and the resisting force reduced by hydrogen atoms.

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Section: Criterion Of Hic Formationmentioning

confidence: 99%

Section: Criterion Of Hic Formationmentioning

confidence: 99%

Section: Fracture Toughness With Hydrogenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation Criterion of Hydrogen-Induced Cracking in Steel Based on Fracture Mechanics

Fang

2018

Metals

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“…HSLA steels containing niobium and/or titanium as the microalloying elements are widely used for construction, line pipe, pressure vessel, engineering, automobile, naval, and defense applications [2][3][4]. Over the past few decades, the need for improved combinations of high strength, toughness and weldability on an industrial scale at affordable prices has driven the development of steel for production lines [5][6][7]. In order to improve transportation efficiency and safety under high pressure conditions, linepipe steel has become thicker and larger in diameter.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Isothermal Treatment on the Microstructural Evolution and the Precipitation Behavior in High Strength Linepipe Steel

Tian

Wang

et al. 2020

Materials

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Isothermal treatment affects the microstructural evolution and the precipitation behavior of high-strength low alloy (HSLA) steels. In this regard, thermal simulation of different isothermal treatment temperatures was adopted by using a thermomechanical simulator. The results showed that hardness reached the maximum value at 600 °C holding temperature, which was related to a finer grain structure and granular bainite. The strengthening effect of precipitates was remarkable due to the combination of small particle size and small interparticle spacing. It is presumed that the precipitation started after 600 s at 600 °C. Precipitation strengthening continued to exist, even though coarsening of ferrite grains led to softening phenomena when the specimen was isothermally held at 750 °C, which led to relatively high hardness. The precipitates were fcc (Ti, Nb) (N, C) particles, and belonged to MX-type precipitates. Average size of precipitates increased from 3.14 to 4.83 nm when the specimens were isothermally held between 600 °C and 800 °C. Interparticle spacing of precipitates also increased with increasing isothermal treatment temperatures. These led to a reduction in precipitation strengthening. At the same time the polygonal ferrite content increased and ferrite grain size got larger, such that the hardness decreased continuously.

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Influence of microalloying elements (Ti, Nb) and nitrogen concentrations on precipitation of pipeline steels—A thermodynamic approach

Yamini

2020

Engineering Reports

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A CALculation of PHase Diagrams (CALPHAD) approach was used to study the precipitation of nitrides and carbonitrides in pipeline steels, aligned with new developments of complex chemical compositions and thermomechanical processing of High Strength Low Alloyed (HSLA) Steels. This is in response to growing demand for improved mechanical and chemical properties, manufacturing flexibility and reduced production cost. The calculated results indicated that the precipitation temperatures of nitrides in Ti‐Nb microalloyed steels increased by titanium concentration, while the niobium concentration significantly increased the precipitation temperature of niobium carbonitrides. Carbonitride precipitates formed at much lower temperatures (∼100 K) in low carbon steels (<0.03 wt%) than the high carbon steels (>0.1 wt%), suggesting precipitates larger in size. This is in good agreement with independent experimental data from the literatures, where austenite grain growth was studied in similar steel compositions. Although the dissolution and growth of precipitates are controlled kinetically, these results proved that the thermodynamic calculation can efficiently predict compositions and sequence of precipitation in chemically complex systems, guiding more accurate designs of experiments to identify critical temperatures of grain coarsening during reheating, recrystallisation during hot rolling, and transformation during cooling. This can minimize the number of tests required to obtain optimum chemical compositions and heat treatment procedures.

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Effect of hydrogen on fracture toughness properties of a pipeline steel under simulated sour service conditions

Cited by 55 publications

References 38 publications

Formation Criterion of Hydrogen-Induced Cracking in Steel Based on Fracture Mechanics

Formation Criterion of Hydrogen-Induced Cracking in Steel Based on Fracture Mechanics

The Impact of Isothermal Treatment on the Microstructural Evolution and the Precipitation Behavior in High Strength Linepipe Steel

Influence of microalloying elements (Ti, Nb) and nitrogen concentrations on precipitation of pipeline steels—A thermodynamic approach

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