Influence of chromium and vanadium in the mechanical resistance of steels

Moro, L.; González, Gabriel J.; Brizuela, G.; Juan, Alfredo; Simonetti, S.

doi:10.1016/j.matchemphys.2007.11.030

Cited by 11 publications

(6 citation statements)

References 4 publications

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“…When the true strain reaches a certain critical value, the true stress does not change significantly with increasing true strain. There isn't the rapid decrease zone of the flow stress in these curves so the true stress-strain curves of 3Cr1Mo0.25V steel belong to the dynamic recovery type under the present experimental conditions [9,10].…”

Section: Resultsmentioning

confidence: 95%

Construction of Flow Stress Constitutive Equation for 3Cr1Mo0.25V Steel

Zhang

Tan

Yang

2012

AMR

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The flow stress change of 3Cr1Mo0.25V steel was researched in this paper through hot compression tests performed in a temperature range from 800 to 900oC and with a strain rate variation from 0.01 to 10s-1. Flow stress constitutive equation was constructed according to true stress-strain curves of 3Cr1Mo0.25V steel. Results indicate that the dynamic recovery is the dynamic softening mechanism of 3Cr1Mo0.25V steel. The flow stress increases with increasing strain rates and decreases with increasing temperature. The rheological behavior of 3Cr1Mo0.25V steel can be characterized by the parameter of Zener-Hollomon in a high temperature range. As for 3Cr1Mo0.25V steel, the activation energy of Q evaluated by the linear regression is about 142.9 kJ/mol.

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Section: Resultsmentioning

confidence: 95%

Construction of Flow Stress Constitutive Equation for 3Cr1Mo0.25V Steel

Zhang

Tan

Yang

2012

AMR

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“…The hydrogen production reactors, hydrogen containers, and hydrogen-chemical facilities are conventionally manufactured using low-alloy steel due to its excellent machinability, mechanical strength, and low manufacturing costs. Currently, the hydrogen permeation resistance of the materials used can be enhanced by elemental ratio adjustment [4][5][6], surface plating [7,8], and other processing methods. Meanwhile, decreasing the surface unevenness of the material, majorizing the surface micro-topography, and modifying the residual stress variation on the material surface to improve its integrity could also enhance the material's hydrogen permeation resistance, reducing the reduction in the mechanical properties of the material caused by hydrogen permeation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Surface Integrity on Hydrogen Permeation Resistance of Hydrogen Production Reactor Materials

Leng,

Zhang,

Wang

et al. 2023

Applied Sciences

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Hydrogen permeation reduces a material’s properties and increases the risk of brittle fracture, which causes a potential safety hazard. A workpiece’s hydrogen permeation resistance could be improved by improving its surface integrity through surface processing. This paper studies low-alloy steel’s surface integrity and its hydrogen permeation resistance in a hydrogen production reactor, using the electrochemical cathodic hydrogen-charging method to carry out electrochemical hydrogen-charging experiments. After the specimens were pretreated using different surface-grinding methods and shot peening pressure strengthening, they were hydrogen-charged on a self-designed and built electrolytic hydrogen charging platform. Before and after hydrogen charging, the specimens’ section hardness and tensile strength were tested, and the fracture morphology of the specimens was observed. The influence laws of surface roughness and surface residual compressive stress on the distribution of material hardness along the depth, the variation in material hardness, the fracture morphology, and the decline in the tensile properties of the low-alloy steel specimens after 5 h of hydrogen charging were analyzed. The reasons for the influence of surface integrity indexes on the hydrogen permeation resistance of the specimens were also analyzed. Based on the experimental results, a series of mechanical processing parameters were proposed to improve the material’s permeation resistance, which provides a theoretical and practical basis for the processing of materials with high surface integrity and hydrogen permeation resistance. Through the experiments, it was found that the hydrogen permeation resistance of the Ra 0.17 μm surface roughness specimen was the best of all specimens with different surface roughness values, and its hydrogen embrittlement sensitivity index was 20.96%. The specimen had the best hydrogen permeation resistance under 336 MPa surface residual compress stress, and its hydrogen embrittlement sensitivity index was 16.45%.

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“…Nowadays, an upgraded version of 2.25Cr1Mo steel, i.e., 2.25Cr1Mo0.25V steel, has been developed and is being employed in the fabrication of new heavy-wall hydrogenation reactors [ 1 ]. This is because the addition of vanadium leads to higher strength and enhanced resistance to hydrogen attack and high temperature damage as compared to traditional 2.25Cr1Mo steel [ 1 , 2 ]. The use of the improved material allows the lightweight design of the hydrogenation reactor, which can significantly reduce the manufacturing cost [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Tensile and Creep Behavior in a CrMoV Steel and Weld Metal

et al. 2021

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The 2.25Cr1Mo0.25V steel is a vanadium-modified 2.25Cr1Mo steel and is being widely used in the manufacture of heavy-wall hydrogenation reactors in petrochemical plants. However, the harsh service environment requires a thorough understanding of high-temperature tensile and creep behaviors of 2.25Cr1Mo0.25V steel and its weld for ensuring the safety and reliability of hydrogenation reactors. In this work, the high-temperature tensile and creep behaviors of base metal (BM) and weld metal (WM) in a 2.25Cr1Mo0.25V steel weldment used for a hydrogenation reactor were studied experimentally, paying special attention to its service temperature range of 350–500 °C. The uniaxial tensile tests under different temperatures show that the WM has higher strength and lower ductility than those of BM, due to the finer grain size in the WM. At the same time, the short-term creep tests at 550 °C reveal that the WM has a higher creep resistance than that of BM. Moreover, the creep damage mechanisms were clarified by observing the fracture surface and microstructures of crept specimens with the aid of scanning electron microscopy (SEM). The results showed that the creep damage mechanisms of both BM and WM are the initiation and growth of creep cavities at the second phase particles. Results from this work indicate that the mismatch in the high-temperature tensile strength, ductility, and creep deformation rate in 2.25Cr1Mo0.25V steel weldment needs to be considered for the design and integrity assessment of hydrogenation reactors.

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Influence of chromium and vanadium in the mechanical resistance of steels

Cited by 11 publications

References 4 publications

Construction of Flow Stress Constitutive Equation for 3Cr1Mo0.25V Steel

Construction of Flow Stress Constitutive Equation for 3Cr1Mo0.25V Steel

Study on the Influence of Surface Integrity on Hydrogen Permeation Resistance of Hydrogen Production Reactor Materials

High-Temperature Tensile and Creep Behavior in a CrMoV Steel and Weld Metal

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