On mechanical properties of novel high-Mn cryogenic steel in terms of SFE and microstructural evolution

Luo, Qi; Wang, H.H.; Li, G.Q.; Sun, Chaoyang; Li, D.H.; Wan, Xiangliang

doi:10.1016/j.msea.2019.02.093

Cited by 55 publications

(13 citation statements)

References 23 publications

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“…Therefore, the strength, ductility, and toughness of high-Mn weld metal can be improved by the TWIP effect at the same time [ 9 ]. According to our previous research, the SFE of the investigated high-Mn steel decreased from 24.1 mJ/m 2 at 20 °C to 17.1 mJ/m 2 at −196 °C [ 4 ].…”

Section: Discussionmentioning

confidence: 96%

“…The growing global demand for liquefied natural gas (LNG) as an environmentally friendly energy source and the increasing quantity of construction and operation of LNG-fueled ships create a growing demand for cryogenic steels [ 1 , 2 , 3 ]. Owing to the excellent comprehensive properties at cryogenic temperature and room temperature, as well as the low cost [ 4 , 5 , 6 ], the high manganese austenitic cryogenic steel (high-Mn steel) has attracted wide attention recently [ 7 , 8 ]. A tremendous amount of existing research reported that high-Mn steel can meet the requirements of cryogenic service of cargo and fuel tanks of LNG carriers and LNG-fueled ships [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Novel High Manganese Austenitic Steel Welded Joints by Arc Welding for Cryogenic Applications of LNG Tanks

Zhang

Wang

et al. 2023

Materials

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The novel high-Mn austenitic steel is becoming a promising steel for cryogenic applications of LNG tanks. The welded joints take a critical role in cryogenic service for storage tanks. In this work, we developed well-matched high-Mn welding consumables and prepared the welded joints by shielded metal arc welding (SMAW), submerged arc welding (SAW) and gas tungsten arc welding (GTAW). The detailed welding parameters were proposed first, then the welding quality, mechanical properties, and microstructure were investigated. The results show that good welding quality, excellent mechanical properties, and stable levels of mechanical properties were obtained for high-Mn steel welded joints using similar welding consumables, the solid core of electrodes, and solid welding wires. Notably, the lowest cryogenic absorbed energy was found at 5 mm away from the fusion line rather than at the fusion line. The hardness of the welded joints was detected to be less than 280 HV due to the whole austenitic microstructure.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Study on the Novel High Manganese Austenitic Steel Welded Joints by Arc Welding for Cryogenic Applications of LNG Tanks

Zhang

Wang

et al. 2023

Materials

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“…where ∆G γ→ε is the Gibbs energy, which is the chemical force for the bulk γ → ε transformation, σ γ/ε is the γ/ε interface energy, and its value is usually between 6 and 10 mJ/m 2 [6]. ρ is the molar surface density along the {111} plane (in moles per unit area), its value can be determined by lattice constant α γ (0.36 nm for TWIP steel), it follows that:…”

Section: Discussionmentioning

confidence: 99%

“…However, there exist some disadvantages for conventional cryogenic materials, such as high cost and poor welding performance [3,4]. Therefore, in searching for novel cryogenic materials, high-manganese austenitic steel becomes a potential candidate cryogenic material [5] due to its high cryogenic impact toughness [6,7] and ductility [8], good fatigue performance, etc. However, compared with ferritic steels, austenitic steels always possess lower thermal conductivity, higher thermal expansion coefficient and greater electrical resistance.…”

Section: Introductionmentioning

confidence: 99%

On Mechanical Properties of Welded Joint in Novel High-Mn Cryogenic Steel in Terms of Microstructural Evolution and Solute Segregation

Ren¹,

Chen²,

Liu³

2020

Metals

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There is a growing demand for high-manganese wide heavy steel plate with excellent welding performance for liquefied natural gas (LNG) tank building. However, studies on welding of high-Mn austenitic steel have mainly focused on the applications of automotive industry for a long time. In the present work, a high-Mn cryogenic steel was welded by multi-pass Shielded Metal Arc Welding (SMAW), and the microstructural evolution, solute segregation and its effect on the properties of welded joint (WJ) were studied. The yield strength, tensile strength and elongation of the WJ reached 804 MPa, 1027 MPa and 11.2% at −196 °C, respectively. The elongation of WJ was reduced with respect to the BM due to the poorer strain hardening capacity of weld metal (WM) at −196 °C. The WM and coarse-grained heat affected zone (CGHAZ) had the lowest cryogenic impact absorbed energy of ~55 J (at −196 °C). The inhibited twin formation caused by the higher critical resolved shear twinning stress ( τ T ) in the C-Mn-Si segregation band, the inhomogeneous microstructure caused by solute segregation, and the hardened austenite matrix deteriorated the plastic deformation capacity, finally resulting in the decreased cryogenic impact toughness of the CGHAZ. To summarize, the cryogenic toughness and tensile properties of the WJ meet the requirements for LNG tank building.

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“…It is demonstrated that the reduction of AGS results in the enhancement of yield and tensile strength but deterioration of the impact toughness. While the Hall-Petch effect stands for the improvement of strength, additional alloying methods [64] should be able to control the SFE of austenite to the regime in which the formation of ε-martensite/twins is more favorable than the direct formation of α ′ -martensite. As a result, the fine-grained austenite matrix can provide the base strength, and the controlled DIMT behavior should lead to the formation of lamellar martensite that can deflect cracks and enhance the impact toughness of the steel.…”

Section: Size-dependent α ′ -Martensite Morphology and Its Effect On ...mentioning

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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On mechanical properties of novel high-Mn cryogenic steel in terms of SFE and microstructural evolution

Cited by 55 publications

References 23 publications

Study on the Novel High Manganese Austenitic Steel Welded Joints by Arc Welding for Cryogenic Applications of LNG Tanks

Study on the Novel High Manganese Austenitic Steel Welded Joints by Arc Welding for Cryogenic Applications of LNG Tanks

On Mechanical Properties of Welded Joint in Novel High-Mn Cryogenic Steel in Terms of Microstructural Evolution and Solute Segregation

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

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