Low-temperature tensile and impact properties of hydrogen-charged high-manganese steel

Nam, Young-Hyun; Park, Jongseo; Baek, Un Bong; Suh, Jin-Yoo; Nahm, Seung Hoon

doi:10.1016/j.ijhydene.2019.01.065

Cited by 28 publications

(7 citation statements)

References 27 publications

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“…Indeed, we found that for the fine-grained samples, the impact toughness increased by 36% as the test temperature was lowered from RT to LNT. Moreover, an extraordinary lowtemperature toughness of more than 450 J at LNT was obtained for the fine-grained sample (see Table 2), representing to the authors' knowledge a new record at present for all reported metals and alloys 9,15,16,22,[33][34][35][36][37][38] . Interestingly, the impact toughness for the coarse-grained sample follows the normally expected toughness-temperature dependence, with a toughness decrease of 38% as the temperature is lowered from RT to LNT.…”

Section: Resultsmentioning

confidence: 62%

“…Comparison with various cryogenic metals. Several alloys, including 304L and 316 austenitic stainless steel and 9% Ni steel, have already been successfully used in cryogenic applications 1,33,36 . Recently, great efforts have been made to develop high-manganese TWIP austenitic steels for cryogenic applications.…”

Section: Resultsmentioning

confidence: 99%

“…Heterogeneous plastic deformationinduced sole by dislocation slip can also result in large stress concentrations at grain boundaries and hence lead to intergranular fracture, as observed in Fe36Mn 15 . This is also likely to be the reason for comparatively low impact toughness for conventional 316(L) 33 with SFE typically higher than 45 mJ m −2 . In this case, grain refinement can reduce slip-based deformation heterogeneity within grains, but is unlikely to reverse the temperature-toughness dependence, as mechanical twinning will not operate.…”

Section: Discussionmentioning

confidence: 99%

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Cryogenic toughness in a low-cost austenitic steel

et al. 2021

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At low temperatures most metals show reduced ductility and impact toughness. Here, we report a compositionally lean, fine-grained Fe-30Mn-0.11C austenitic steel that breaks this rule, exhibiting an increase in strength, elongation and Charpy impact toughness with decreasing temperature. A Charpy impact energy of 453 J is achieved at liquid nitrogen temperatures, which is about four to five times that of conventional cryogenic austenitic steels. The high toughness is attributed to manganese and carbon austenite stabilizing elements, coupled with a reduction in grain size to the near-micrometer scale. Under these conditions dislocation slip and deformation twinning are the main deformation mechanisms, while embrittlement by α′- and ε-martensite transformations are inhibited. This reduces local stress and strain concentration, thereby retarding crack nucleation and prolonging work-hardening. The alloy is low-cost and can be processed by conventional production processes, making it suitable for low-temperature applications in industry.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Cryogenic toughness in a low-cost austenitic steel

et al. 2021

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“…Particularly for hydrogen fuel cell vehicles, an important condition for safety is the reliability of the vehicle-mounted hydrogen container. Nam et al [142] examined the high-manganese steels for hydrogen-related properties. In a low-temperature hydrogen environment, materials can be affected by hydrogen embrittlement and low-temperature embrittlement (LTE), which involves the weakening of materials exposed to low temperatures.…”

Section: Stainless Steelsmentioning

confidence: 99%

Current Trends in Metallic Materials for Body Panels and Structural Members Used in the Automotive Industry

Trzepieciński,

Najm

2024

Materials

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The development of lightweight and durable materials for car body panels and load-bearing elements in the automotive industry results from the constant desire to reduce fuel consumption without reducing vehicle performance. The investigations mainly concern the use of these alloys in the automotive industry, which is characterised by mass production series. Increasing the share of lightweight metals in the entire structure is part of the effort to reduce fuel consumption and carbon dioxide emissions into the atmosphere. Taking into account environmental sustainability aspects, metal sheets are easier to recycle than composite materials. At the same time, the last decade has seen an increase in work related to the plastic forming of sheets made of non-ferrous metal alloys. This article provides an up-to-date systematic overview of the basic applications of metallic materials in the automotive industry. The article focuses on the four largest groups of metallic materials: steels, aluminium alloys, titanium alloys, and magnesium alloys. The work draws attention to the limitations in the development of individual material groups and potential development trends of materials used for car body panels and other structural components.

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“…Recently, the development of ternary-based austenitic steel alloys (Fe 1−x−y Mn x Cr y with y << x << 1 and lower C concentrations) with attractive mechanical properties, an inhibiting nature in relation to hydrogen penetration, and erosion–corrosion resistance, were reported [ 1 , 2 , 3 ]. Despite the intrinsic weakness arising from their higher Mn concentrations (i.e., the standard reduction potential of Mn (−1.18 V) is much lower than that of Fe (−0.447 V) [ 4 , 5 ]), their long-term corrosion resistance is much higher than conventional API (American petroleum institute)-grade low-C steel and is even comparable to 9% Ni steel in a neutral aqueous environment.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Corrosion Behavior of Strong and Ductile High Mn-Low Cr Steel in Acidic Aqueous Environments

et al. 2022

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To expand the industrial applicability of strong and ductile high Mn-Low Cr steel, a deeper understanding and mechanistic interpretation of long-term corrosion behavior under harsher environmental conditions are needed. From this perspective, the long-term corrosion behaviors of 24Mn3Cr steel under acidic aqueous conditions were examined through a comparison with conventional ferritic steels using the electrochemical measurements (linear polarization resistance and impedance), and immersion test followed by the metallographic observation of corrosion morphologies. In contrast to conventional ferritic steels, 24Mn3Cr steel, which had the lowest corrosion resistance at the early immersion stages (i.e., the highest corrosion current density (icorr) and lowest polarization resistance (Rp)), showed a gradual increase in corrosion resistance with prolonged immersion. Owing to the slow formation kinetics of (Fe,Cr)-enriched oxide scale, a longer incubation time for ensuring a comparatively higher corrosion resistance is required. On the other hand, conventional ferritic steels had an oxide scale with less densification and a lower elemental enrichment level that did not provide an effective anti-corrosion function. From the results, this study can provide significant insight into the industrial applicability of the high Mn-low Cr steel by providing the mechanistic interpretation of corrosion behaviors in acidic aqueous environments.

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Low-temperature tensile and impact properties of hydrogen-charged high-manganese steel

Cited by 28 publications

References 27 publications

Cryogenic toughness in a low-cost austenitic steel

Cryogenic toughness in a low-cost austenitic steel

Current Trends in Metallic Materials for Body Panels and Structural Members Used in the Automotive Industry

Long-Term Corrosion Behavior of Strong and Ductile High Mn-Low Cr Steel in Acidic Aqueous Environments

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