Effects of Cr addition on Charpy impact energy in austenitic 0.45C-24Mn-(0,3,6)Cr steels

Lee, Seok Gyu; Kim, Bohee; Jo, Min Cheol; Kim, Kyeong Min; Lee, Junghoon; Bae, Jinho; Lee, Byeong-Joo; Sohn, Seok Su; Lee, Sunghak

doi:10.1016/j.jmst.2019.12.032

Cited by 36 publications

(15 citation statements)

References 44 publications

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“…The mechanical properties of high-manganese steels can be controlled by utilizing deformation mechanisms, which vary with stacking fault energy (SFE) [12][13][14]. When the SFE is in the range of 20-45 mJ/m 2 , deformation twinning occurs, while lower SFE (<18 mJ/m 2 ) is conducive to martensitic transformation [15].…”

Section: Introductionmentioning

confidence: 99%

“…As the temperature decreases from RT to LNT, the SFE of the high-manganese steel usually decreases by 20-50% [15]. Martensitic transformation in high-manganese steel can be effectively suppressed by adding austenite-stabilizing elements such as Mn, Al, or C; at the same time, the formation of deformation twins enhances the cryogenic mechanical properties [3,14,16].…”

Section: Introductionmentioning

confidence: 99%

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Dependence of Charpy Impact Properties of Fe-30Mn-0.05C Steel on Microstructure

Xiong

Kong

et al. 2023

Crystals

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Fe-30Mn-0.05C steel specimens with cold-rolled, partially recrystallized, fine-grained, and coarse-grained microstructures were fabricated by means of 80% cold rolling followed by annealing at 550–1000 °C. The initial and deformed microstructures were characterized, and the Charpy impact properties were tested at room temperature (RT) and liquid nitrogen temperature (LNT). It was found that the Charpy absorbed energy increased with the annealing temperature, while the specimens showed different trends: parabolic increase at RT and exponential increase at LNT, respectively. Compared with the fully recrystallized specimens, those with a partially recrystallized microstructure exhibited lower impact energy, especially at LNT. This was because cracks tended to nucleate and propagate along the recovery microstructure where stress concentration existed. The grain size played an important role in the twinning behavior and impact properties. High Charpy impact energy (~320 J) was obtained in the coarse-grained specimen having the grain size of 42.1 μm at both RT and LNT, which was attributed to the activation of high-density deformation twinning. However, deformation twinning was inhibited in the specimen with the average grain size of 3.1 μm, resulting in limited work hardening and lower impact energy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dependence of Charpy Impact Properties of Fe-30Mn-0.05C Steel on Microstructure

Xiong

Kong

et al. 2023

Crystals

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“…The high strain rates during the Charpy impact tests (10 2 -10 3 s − 1 ) make it hard to study the effect of DIMT on E i . Thus, the relationship between the E p and DIMT has been the main focus of previous studies [16,17], and it is often found that the decrease in deformation-induced ε/α ′ -martensite (DIM) results in an increase in E p [18][19][20][21]. In austenitic steels, the negative impact of DIM on toughness [22,23] demonstrates that the brittle DIMT products are the source of cracks or fast crack propagation in martensite or the martensite/austenite interface [24,25].…”

Section: Introductionmentioning

confidence: 99%

Influence of DIMT on impact toughness: Relationship between crack propagation and the α′-martensite morphology in austenitic steel

Huang

Wang

et al. 2022

Materials Science and Engineering: A

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“…Liquefied natural gas (LNG) has been used as a clean energy in effectively replacing conventional energy sources and controlling global warming [1]. The development of alloys with excellent mechanical properties at cryogenic temperatures for LNG tanks is globally demanded for the stable transportation of LNG [2, 3]. The novel cryogenic high-Mn austenitic steel is a strong candidate due to its excellent cryogenic impact toughness and superior economic advantages for replacing conventional 9% Ni cryogenic steels, austenitic stainless steels and Invar alloys for the fabrication of LNG tanks [4, 5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, non-metallic inclusions and impact toughness of high-Mn cryogenic steel weld metal

Zhang

Wang

et al. 2022

Science and Technology of Welding and Joining

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Microstructure, inclusions and cryogenic impact toughness of Fe-22.03Mn-0.45C austenitic weld metal were investigated. The results show that microstructure of weld metal consisted of straight columnar dendrites with different orientations. Microsegregation of Mn was observed in the interdendritic regions and Mn depletion thus occurred in the dendrite core, which is suggested to lead to the different morphologies of MnS oxides (Mn-Al-Si-O) depending on their location. MnS patch-type oxides were found at dendrite boundary and MnS shell-type oxides were found at dendrite core. Inclusions as crack sources were distributed in the dimple of cryogenic impact fractography, it was found that MnS patch-type oxides were more ready to act as a crack source and cause the formation of dimples than MnS shell-type oxides.

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Effects of Cr addition on Charpy impact energy in austenitic 0.45C-24Mn-(0,3,6)Cr steels

Cited by 36 publications

References 44 publications

Dependence of Charpy Impact Properties of Fe-30Mn-0.05C Steel on Microstructure

Dependence of Charpy Impact Properties of Fe-30Mn-0.05C Steel on Microstructure

Influence of DIMT on impact toughness: Relationship between crack propagation and the α′-martensite morphology in austenitic steel

Microstructure, non-metallic inclusions and impact toughness of high-Mn cryogenic steel weld metal

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