The possibility of enhanced hydrogen embrittlement resistance of medium-Mn steels by addition of micro-alloying elements

Park, Tak Min; Kim, Hye Jin; Um, Ho Yong; Goo, Nam Hoon; Han, Jeongho

doi:10.1016/j.matchar.2020.110386

Cited by 29 publications

(31 citation statements)

References 43 publications

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“…Therefore, the austenite morphology may be a secondary factor, compared to the austenite fraction and stability parameters. Limited information is available on the effect of micro alloy precipitation on the H-resistance of medium-Mn steel, except for the study by Park et al [55], who argued that the effect of micro alloy precipitates, mostly formed in the ferritic regions, on the overall HE sensitivity was insignificant. Nevertheless, there remains a potential opportunity to employ precipitates (e.g., Cu-associated precipitates) for H trapping, as there are not a sufficient number of publications yet to clarify precipitate effects on the H-resistance of medium-Mn steel.…”

Section: Discussionmentioning

confidence: 99%

“…However, the influence of micro alloy precipitates has not been broadly explored in medium-Mn steels. Park et al [55] evaluated the HE resistance of medium-Mn steels micro alloyed with Nb, Ti, and V compared to a reference steel (Fe-6Mn-0.08C, in wt pct). They reported that the effects of the microalloying additions on the H-resistance were insignificant for the investigated test conditions.…”

Section: Other Alloying Elements and Precipitatesmentioning

confidence: 99%

“…The hold times in the "tempering" step used for the Cu-free and Cu-added steels were 5 and 2 h, respectively. Figure 10a, b shows the 3D-APT results for the ferritic and austenitic regions in the Cu-added medium-Mn steel, indicating that Cu, as opposed to the microalloying example above [55], precipitated primarily in the austenite, rather than in the ferrite, despite the increased solubility of Cu in austenite compared to ferrite. In contrast, the APT map of the ferritic region (Figure 10a) shows non-uniformity in the Ni signal; TEM selected area diffraction analysis by Li et al [56] revealed that the Ni-enriched regions in the ferrite are associated with B2 NiAl precipitates.…”

Section: Other Alloying Elements and Precipitatesmentioning

confidence: 99%

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Hydrogen Embrittlement of Medium Mn Steels

Cho

Kong

Speer

et al. 2021

Metals

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Recent research efforts to develop advanced–/ultrahigh–strength medium-Mn steels have led to the development of a variety of alloying concepts, thermo-mechanical processing routes, and microstructural variants for these steel grades. However, certain grades of advanced–/ultrahigh–strength steels (A/UHSS) are known to be highly susceptible to hydrogen embrittlement, due to their high strength levels. Hydrogen embrittlement characteristics of medium–Mn steels are less understood compared to other classes of A/UHSS, such as high Mn twinning–induced plasticity steel, because of the relatively short history of the development of this steel class and the complex nature of multiphase, fine-grained microstructures that are present in medium–Mn steels. The motivation of this paper is to review the current understanding of the hydrogen embrittlement characteristics of medium or intermediate Mn (4 to 15 wt pct) multiphase steels and to address various alloying and processing strategies that are available to enhance the hydrogen-resistance of these steel grades.

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Section: Discussionmentioning

confidence: 99%

Section: Other Alloying Elements and Precipitatesmentioning

confidence: 99%

Section: Other Alloying Elements and Precipitatesmentioning

confidence: 99%

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Hydrogen Embrittlement of Medium Mn Steels

Cho

Kong

Speer

et al. 2021

Metals

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“…Current engineering solutions normally include preventing H ingress by applying protective coatings 3,16 , which can fail under abrasive and corrosive environments 17 . An alternative is to design microstructures that are intrinsically resilient (for example, through grain refinement 18 or introducing H-trapping precipitates 3,10,19 ), but such measures have led to reduced strain-hardening ability and/or ductility in the H-free condition 18,19 . Microalloying in steels to form various H-trapping precipitates (for example, Ti-based and V-based carbides) can suppress internal H migration 3,20 , although it increases the materials' cost.…”

mentioning

confidence: 99%

“…However, its phase transformation product (martensite) and the associated hetero-interfaces are strongly prone to H-induced cracking, which is the major reason leading to the premature failure of such materials when exposed to H (refs. 15,19 ). To manipulate the chemical heterogeneity inside the austenite phase, we designed a multi-step annealing process compatible with current industrial practice (Methods).…”

mentioning

confidence: 99%

Chemical heterogeneity enhances hydrogen resistance in high-strength steels

et al. 2021

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The antagonism between strength and resistance to hydrogen embrittlement in metallic materials is an intrinsic obstacle to the design of lightweight yet reliable structural components operated in hydrogen-containing environments. Economical and scalable microstructural solutions to this challenge must be found. Here, we introduce a counterintuitive strategy to exploit the typically undesired chemical heterogeneity within the material’s microstructure that enables local enhancement of crack resistance and local hydrogen trapping. We use this approach in a manganese-containing high-strength steel and produce a high dispersion of manganese-rich zones within the microstructure. These solute-rich buffer regions allow for local micro-tuning of the phase stability, arresting hydrogen-induced microcracks and thus interrupting the percolation of hydrogen-assisted damage. This results in a superior hydrogen embrittlement resistance (better by a factor of two) without sacrificing the material’s strength and ductility. The strategy of exploiting chemical heterogeneities, rather than avoiding them, broadens the horizon for microstructure engineering via advanced thermomechanical processing.

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Effect of aging temperature on corrosion resistance and antibacterial ability of 0Cu2Cr carbon steel

Guo

Teng

et al. 2021

Materials & Corrosion

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The effect of heat treatment on the corrosion resistance and antibacterial ability of 0Cu2Cr carbon steel was studied using scanning electron microscopy, transmission electron microscopy, laser scanning confocal microscopy, and electrochemistry. The results showed that the peak aging state with complete crystal growth and uniform precipitate phase distribution was attained at the aging temperature of 850°C. Both the Cu‐rich phase with an approximately spherical structure and the dispersive Cu‐ordered phase with a B2 structure were observed in the grain boundary and internal crystal and effectively improved the hardness of the steel because of precipitation strengthening. Thus, the corrosion resistance and antibacterial ability of the 0Cu2Cr carbon steel could be improved by aging it at 850°C.

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The possibility of enhanced hydrogen embrittlement resistance of medium-Mn steels by addition of micro-alloying elements

Cited by 29 publications

References 43 publications

Hydrogen Embrittlement of Medium Mn Steels

Hydrogen Embrittlement of Medium Mn Steels

Chemical heterogeneity enhances hydrogen resistance in high-strength steels

Effect of aging temperature on corrosion resistance and antibacterial ability of 0Cu2Cr carbon steel

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