Microstructure and Mechanical Property of Strip in Fe–23Mn–3Si–3Al TWIP Steel by Twin Roll Casting

Wang, S. H.; Liu, Z. Y.; Zhang, Weina; Wang, G. D.; Liu, J. L.; Liang, Guoxing

doi:10.2355/isijinternational.49.1340

Cited by 27 publications

(7 citation statements)

References 17 publications

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“…However, these steels are becoming important and such knowledge is required to ensure slab surface cracking is not a problem in the continuous casting process and subsequent hot rolling stages. Recently, Wang et al [102] pointed out large edge cracks occur in strips of TWIP steel (Fe-23Mn-3Si-3Al) fabricated by conventional hot rolling. They believe that lack of hot workability is the major cause for edge cracking in hot rolled TWIP steel.…”

Section: Manganesementioning

confidence: 99%

Hot ductility of TWIP steels

Kang

Tuling

Banerjee

et al. 2011

Materials Science and Technology

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The hot ductility of twin induced plasticity (TWIP), 0·6 wt-C steels containing 18–22 wt-Mn with N levels in the range 0·005–0·023 wt- and the Al additions either low (<0·05 wt-) or high (1·5 wt-) has been examined. Little change in ductility occurred in the temperature range 1100–650°C as the structure was always fully austenitic. Ductility was generally poor (<40), reduction of area values, the best ductility at the higher Al level being given by the steel with the lowest N and S levels. Because the steel is fully austenitic, the ductility is solely dependent on that for unrecrystallised austenite. Therefore, to avoid transverse cracking the volume of second phase particles should be kept to a minimum, i.e. the N should be low to reduce the amount of AlN that can be precipitated out and the S level should be as low as possible to limit the amount of MnS inclusions. Metallographic and TEM studies were carried out and the poor ductility was found to be due to extensive precipitation of AlN at the austenite grain boundaries. Increasing the cooling rate from the melting point to the test temperature from 60 to 180°C min−1 or introducing an undercooling step both led to even worse ductility.

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Section: Manganesementioning

confidence: 99%

Hot ductility of TWIP steels

Kang

Tuling

Banerjee

et al. 2011

Materials Science and Technology

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“…[4][5][6] Recently, the nitride inclusions, e.g., AlN formed during steelmaking and continuous casting processes, was shown to affect not only the surface qualities but also the microstructures of steel products. [7][8][9] Therefore, the nitrogen content in molten HMnS should be tightly controlled during manufacturing at high temperatures. However, reliable thermodynamic data for nitrogen solubility and the interaction parameter between Mn and N in HMnS melts are required in order to control the formation of AlN.…”

mentioning

confidence: 99%

Solubility of Nitrogen in High Manganese Steel (HMnS) Melts: Interaction Parameter between Mn and N

Shin

Min

Park

2011

Metall Mater Trans B

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Nitrogen solubility in Fe-Mn melts was measured using a N 2 bubbling and sampling method at temperatures from 1823 K to 1923 K (1550°C to 1650°C) for manganese content to about 25 mass pct. The effect of temperature on the nitrogen solubility was well described based on the thermodynamic behavior of Fe-Mn system. Furthermore, the interaction parameter between Mn and N was evaluated as a function of temperature. The present results can be used in thermodynamic analyses of the formation of nitride compounds such as AlN or TiN in high manganese steel melts for example, transformation induced plasticity (TRIP) and twin induced plasticity (TWIP) aided steels as well as high Mn-N alloyed stainless steels.

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“…However, the measured solidus of TWIP steels by DSC or DTA was much higher than the predicted . Besides, the solidification microstructure of TWIP steel was observed to be quite coarse with developed columnar dendrite and equiaxed grains, which were generally attributed from low thermal conductivity . The quantitative comparison on the heat transfer performance between TWIP steel and others has been rarely reported.…”

Section: Introductionmentioning

confidence: 84%

“…In early 2003, Spitzer et al introduced a direct strip casting technology to cast high manganese TWIP and TRIP steels with the purpose to avoid bending and unbending cracks in traditional slab . Ha et al and Wang et al experimentally investigated the solidification structure and dent defect of TWIP steel by twin strip casting . Daamen et al made comparisons on microstructure and mechanical property of Fe–22Mn–0.6C TWIP steel between strip casting and ingot casting .…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties and Solidification Defects of Fe-22Mn-0.7C TWIP Steel

Peng

Zhang

2015

steel research int.

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The thermophysical properties and solidification defects of Fe-Mn-C twinning-induced plasticity (TWIP) steel have been experimentally studied. The liquidus and solidus of Fe-22Mn-0.7C TWIP steels are measured to be 1380 AE 10 and 1270 AE 108C, respectively. The thermal conductivity of Fe-22Mn-0.7C steel is the lowest compared with that of carbon steel Q235 and stainless steels 304 and J4. Combined with the highest thermal expansion coefficient of TWIP steel, internal cracking is apt to occur due to the extremely large thermal stress during cooling and heating. Severe shrinkage porosity and segregation have been observed in high alloy TWIP steel with large mushy zone. The macrosegregation of manganese along the central line is not as serious as that of carbon in TWIP steel, and the manganese/carbon microsegregation increases with the increase of not only manganese/carbon but also carbon/manganese. TWIP steel is liable to exhibit central shrinkage porosity due to the coarse dendrite and serious microsegregation during solidification. In order to improve the homogeneity and compactness of TWIP steel during traditional slab casting, combining application of control technology, such as decreasing steel casting temperature, descending water cooling intensity, and utilizing electromagnetic stirring and/or soft reduction, is strongly recommended.

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Microstructure and Mechanical Property of Strip in Fe–23Mn–3Si–3Al TWIP Steel by Twin Roll Casting

Cited by 27 publications

References 17 publications

Hot ductility of TWIP steels

Hot ductility of TWIP steels

Solubility of Nitrogen in High Manganese Steel (HMnS) Melts: Interaction Parameter between Mn and N

Thermophysical Properties and Solidification Defects of Fe-22Mn-0.7C TWIP Steel

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