Hydrogen trapping and desorption of dual precipitates in tempered low-carbon martensitic steel

Lin, Yu‐Chen; McCarroll, Ingrid; Lin, Yi‐Ting; Chung, Wei-Chih; Cairney, Julie M.; Yen, Hung‐Wei

doi:10.1016/j.actamat.2020.06.046

Cited by 59 publications

(11 citation statements)

References 58 publications

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“…Hence, compared to micro-alloyed AHSS [42,43] DP steels contain mainly shallow hydrogen trapping sites, e.g., trapping sites at dislocations [36,38], lath martensite boundaries [42,43] or in volumes under micro-residual stress [53]. Although the titanium and niobium content in the chemical compositions of the investigated DP steels were not low, deep trapping sites, as they were found in literature for Titanium carbides and Niobium carbides [44,46,64], could not be observed in the measured TDS spectra. Linear heating to 900 °C did not reveal additional hydrogen peaks, which could be related hydrogen desorption from bulk.…”

Section: Characterization Of Hydrogen Content and Desorption Energymentioning

confidence: 59%

“…To the authors knowledge, microstructural evolution and phase transformation are currently not considered in an any TDS interpretation. Lin et al [64] argued that TDS peaks at higher temperatures may superpose with hydrogen from dissociation of water molecules at the surface. In addition, Hitzigrath [65] studied the influence of the carrier gas on high temperature peaks and found an influence the high temperature peaks.…”

Section: Characterization Of Hydrogen Content and Desorption Energymentioning

confidence: 99%

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The role of hydrogen diffusion, trapping and desorption in dual phase steels

et al. 2022

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Hydrogen embrittlement (HE) of advanced high-strength steels is a crucial problem in the automotive industry, which may cause time-delayed failure of car body components. Practical approaches for evaluating the HE risk are often partially and contradictive in nature, because of hydrogen desorption during testing and inhomogenous hydrogen distributions in, e.g., notched samples. Therefore, the present work aims to provide fully parametrized and validated bulk diffusion models for three dual phase steels to simulate long-range chemical diffusion, trapping and hydrogen desorption from the surface. With one constant set of parameters, the models are able to predict the temperature dependency of measured Choo-Lee plots as well as the concentration dependency of measured effective diffusion coefficients. Finally, the parametrized and validated bulk diffusion models are applied for studying the role of the current density on the permeation time and the role of coatings as effective diffusion barriers. Graphical abstract

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Section: Characterization Of Hydrogen Content and Desorption Energymentioning

confidence: 59%

Section: Characterization Of Hydrogen Content and Desorption Energymentioning

confidence: 99%

The role of hydrogen diffusion, trapping and desorption in dual phase steels

et al. 2022

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“…47,[58][59] However, there was also a view that incoherent MC carbides could not trap hydrogen through cathodic charging. 53,60 Even though MC carbides have a strong hydrogen trapping capability, the hydrogen trapping benefit from MC carbides in LAM UNS K92580 steel is limited due to a low concentration (∼0.022 wt%) of Nb. In addition to MC and M 2 C carbides, heat treatment also prompts the formation of a few M 23 C 6 carbides and M 6 C carbides in the steel, associated with presence of hydrogen traps with E d values of 74.2 kJ/mol for the BM specimen and 83.0 kJ/mol for the TM specimen (Tables 3, 4, and Ran, et al 24 ).…”

Section: Science Sectionmentioning

confidence: 99%

“…Different trap activation energy in a range can be corresponding to the grain boundary of different misorientation. 60 Furthermore, the intensity of these irreversible hydrogen traps can be further increased by increasing the misorientation angles of matrix packet/block/plate boundaries (Tables 3 and 4, and Figure 7). Therefore, the E d values of hydrogen trap corresponding to the 2nd and 3rd Peaks of the BM specimen with higher misorientation angle are higher than those of the AD specimen and the TM specimen (Table 4).…”

Section: Science Sectionmentioning

confidence: 99%

Hydrogen Diffusion and Trapping in Laser Additively Manufactured Ultra-High Strength AerMet100 Steel

et al. 2021

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Hydrogen trapping and the permeation behavior of laser additively manufactured (LAM) AerMet100 steel with an as-deposited specimen (AD) and after three types of heat-treated specimens (BM, TBMM, and TM) was investigated. At least three types of different hydrogen traps were identified in each microstructure of LAM AerMet100 steel, including both reversible and irreversible H traps. For as-deposited microstructure, the main reversible H trap states are related to the precipitation of M3C carbides associated with a detrapping activation energy (Ed) of 17.3±0.2 kJ/mol. After heat treatment, the dominant reversible hydrogen trap states in the tempered martensite microstructure have a different Ed value of 19.3±0.5 kJ/mol, which is attributed to the precipitation of highly coherent M2C carbides. In comparison with the reported Ed value of ~21.4 kJ/mol for main reversible hydrogen traps in wrought AerMet100 steel, the less Ed value in LAM AerMet100 steel is closely related to the composition change of M2C carbides. In all of the H pre-charged samples, the diffusible and total H concentration of the TM specimen and the TBMM specimen are about 3-4 times higher than that of the AD specimen and the BM specimen. The TM specimen with tempered martensite microstructure has the highest diffusible and total H concentration due to its high density of dominantly reversible H traps. The effective hydrogen diffusion coefficient (Deff) of LAM AerMet100 steel is on the order of 10-9 cm2/s, and decreases with increasing density of dominantly reversible H traps brought about by heat treatment. Furthermore, compared with wrought AerMet100 steel of a similar yield strength (~1750 MPa), the LAM AerMet100 steel has a comparable Deff of about 2.8×10-9 cm2/s.

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“…The second aspect is high residual stress after forming and quenching, which, together with external stress, intensifies the promoting effect of hydrogen diffusion. If hydrogen aggregates toward the higher-stress concentration area, it further increases the risk of hydrogen-induced cracking [14][15][16]. However, dislocation and stress are difficult to avoid during material preparation.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Addition of Nb and V on the Microstructural Evolution and Hydrogen Embrittlement Resistance of High Strength Martensitic Steels

Liu

Liao²,

Tang

et al. 2022

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Hydrogen embrittlement can easily occur in high strength martensitic steel, manifesting itself as a sudden failure or fracture without warning and greatly threatening the safety of automotive applications. Optimizing the composition of the alloy can be performed by matching heat treatment processing methods and controlling the precipitation amounts to form hydrogen traps. In doing so, the hydrogen embrittlement susceptibility of steel can be effectively delayed, reducing the risk of hydrogen-induced delayed cracking. In this study, four kinds of 1500 MPa strength grade martensitic steel were selected for testing and supplemented with different loadings of Nb and V, respectively. Their grains, phases, and precipitations were compared by optical microscopy (OM), electron backscattered diffraction (ESBD), and transmission electron microscopy (TEM) analyses. After the addition of Nb and V, the microstructure was refined, the residual austenite content increased, and the hydrogen embrittlement resistance was significantly improved.

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Hydrogen trapping and desorption of dual precipitates in tempered low-carbon martensitic steel

Cited by 59 publications

References 58 publications

The role of hydrogen diffusion, trapping and desorption in dual phase steels

The role of hydrogen diffusion, trapping and desorption in dual phase steels

Hydrogen Diffusion and Trapping in Laser Additively Manufactured Ultra-High Strength AerMet100 Steel

Effects of the Addition of Nb and V on the Microstructural Evolution and Hydrogen Embrittlement Resistance of High Strength Martensitic Steels

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