Effect of hydrogen in advanced high strength steel materials

Fan

et al. 2021

steel research int.

Microstructure observations, thermal desorption spectroscopy (TDS) tests, hydrogen permeation measurements, electrochemical tests, and slow strain rate tensile (SSRT) tests are conducted investigate the beneficial effect of Nb microalloying on the stress corrosion cracking (SCC) behavior of high-strength low-alloy (HSLA) steels in a simulated deep-sea environment. The results show that the addition of Nb significantly decreases the SCC susceptibility of HSLA steel in a simulated deep-sea environment, and the role of Nb is attributed to microstructure optimization and the strong hydrogen-trap function of nanosized NbC precipitates with hydrogen activation energy up to 100.5 kJ mol À1 . In the simulated deep-sea environment, the SCC resistance of HSLA steel is enhanced by microstructure optimization and the hydrogen-trap function via Nb microalloying, and both anodic dissolution (AD) and hydrogen embrittlement (HE) are weakened. Moreover, the improvement of SCC resistance of HSLA steel with a higher hydrogen concentration via Nb microalloying is more obvious, in which the decrease of hydrogen-induced anodic dissolution (HIAD) and HE effects is more distinct, and the strong hydrogen-trap effect of NbC precipitates is the predominant mechanism to improve SCC resistance.

Section: Tds Resultsmentioning

confidence: 98%

Improved Stress Corrosion Cracking Resistance of High‐Strength Low‐Alloy Steel in a Simulated Deep‐Sea Environment via Nb Microalloying

Fan

et al. 2021

steel research int.

Inorg. Mater. Appl. Res.

“…It is shown in [52] that, in order to protect the elements of turbines for thermal power plants made of TRIP steels, it is efficient to use the deposition of ceramic heat-protective coatings, and in [53] it is recommended to use the deposition of coatings and the creation of surface diffusion layers to protect TRIP and TWIP steels from hydrogen embrittlement in the course of the operation in hydrogen-containing environments. In an analytical review [54], it is noted that TRIP and TWIP are increasingly becoming a material chosen by many car manufacturers.…”

Section: Composites On the Basis Of Coatingsmentioning

confidence: 99%

Structural Features and Strength Behavior of TRIP/TWIP Steels

Prosvirnin

Larionov

Pivovarchik

et al. 2021

A review of the published data concerning the structural features of TRIP/TWIP steels, the relationship thereof to mechanical properties, and the relationship between strength parameters under static and cyclic loading is presented. It is shown that the level of mechanical properties of such steels is determined by the chemical composition and processing technology (thermal and thermomechanical processing, hot and cold pressure treatment), aimed at achieving a favorable phase composition. At the atomic level, the most important factor is represented by stacking fault energy, the level of which is decisive in the formation of austenite twins and/or in the formation of strain martensite. By choosing the chemical composition, one can set the level of stacking fault energy corresponding to the required mechanical characteristics. In the case of cyclic loading, an important role is played by the strain rate and the maximum load in the course of testing. So, at a high loading rate and a load approaching the yield strength under tension, the intensity of twinning processes and the rate of formation of martensite increases. It has been shown that one of the relevant ways to further improving the structural and functional properties of TRIP and TWIP steels consists in developing composite materials based on them. At present, surface modification and coating application, especially by means ion-vacuum methods, can be considered the most promising direction for making such composites.

IOP Conf. Ser.: Mater. Sci. Eng.

“…It can be due to the presence of hydrogen or H2S gas in the atmosphere or hydrogen diffusion from the use of hydrocarbon lubricants etc. [9,14] The mechanism of fatigue under the effect of hydrogen embrittlement is very complex and is affected by various factors like the microstructure of the metal, presence of inclusions, the source of hydrogen, surface characteristic of sample, testing conditions and the method of hydrogen charging etc. There is no clear mechanism that can fully explain the HE in fatigue.…”

Section: Introductionmentioning

confidence: 99%

“…In this synergistic model, the mechanism of fracture transitions from HELP to HEDE as the concentration of hydrogen increases above a critical level. [9,22,26] The susceptibility of the material to hydrogen embrittlement increases with the increasing strength and hardness of materials. [8,12] Hence, it is important to study the effect on advanced high strength steel (AHSS) which are susceptible to H.E.…”

Section: Introductionmentioning

confidence: 99%

A study of the effect of hydrogen on the fatigue behaviour of metals

Lokhande

Vishwakarma

2022

Self Cite

Hydrogen Embrittlement is a phenomenon in which the presence of hydrogen can lead to various detrimental effects on the mechanical properties of the material. These effects include reduction in ductility, delayed fracture under constant loading, increase in fatigue crack initiation and growth rates, and subcritical cracking even below the threshold fracture toughness of the material. Fatigue is one of the most common modes of material nature during the operation of components during their service life. Hence it is very important to study the effect of hydrogen on the fatigue behaviour of steel and find methods for their prevention. This paper deals with the study of hydrogen on various types of fatigue in materials, various factors that affect the susceptibility to HE in fatigue, the effect on the microscopic morphology of the fatigue crack generated and the methods suggested for the prevention of HE in fatigue.