Microstructural Changes in a High-Manganese Austenitic Fe-Mn-Al-C Steel

Witkowska, M.; Zielińska‐Lipiec, A.; Kowalska, J.; Ratuszek, W.

doi:10.2478/amm-2014-0163

Cited by 16 publications

(11 citation statements)

References 25 publications

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“…Reversed austenite can be effectively used in many types of steel, such as maraging steels, TRIP steels, austenitic TWIP [14,15,16]. These steels are often joined by GTAW welding.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization of Welds in X5CrNiCuNb16-4 Steel in Overaged Condition

Ziewiec

Zielińska‐Lipiec

Kowalska

et al. 2019

Advances in Materials Science

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The paper presents the results of the investigation of microstructure of the welded X5CrNiCuNb16-4 (17-4PH) steel after solution treatment and aging at 620°C for different periods. The microstructure and the phase composition of the steel was investigated using light microscopy (LM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), transmission electron microscopy (TEM) and the X-ray diffraction (XRD). Hardness was measured for samples aged at different times. Density distributions of Cu precipitates were established. The investigation has shown that the microstructure of the X5CrNiCuNb16-4 steel welds after aging at 620 ° C consists of tempered martensite, fine Cu precipitates and austenite. It was observed that the size of the Cu precipitates increases with increasing the aging time, what affects the decrease of hardness. Simultaneously, the quantity of reversed austenite increases with increase of aging time. It was revealed that enrichment of the austenite in Ni, Cu and C affects the increase of Ms, but this factor does not determine the stability of austenite.

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“…Reversed austenite can be effectively used in many types of steel, such as maraging steels, TRIP steels, austenitic TWIP [14,15,16]. These steels are often joined by GTAW welding.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization of Welds in X5CrNiCuNb16-4 Steel in Overaged Condition

Ziewiec

Zielińska‐Lipiec

Kowalska

et al. 2019

Advances in Materials Science

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“…The high C-high Mn grades needed to expand the austenite phase region to improve the ductility. Although Fe-Al-Mn-C steels have attracted interest as lightweight steels, the κ-carbide with perovskite structures occurs with increasing Al content, which causes brittleness of a Fe-Al-Mn-C steel with a high Al content [11][12]. So the formation of k-carbide was inhibited by adding precipitation hardening element Ti.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and mechanical properties of 980MPa grade Fe-Mn-Al-C lightweight steel

Jiang

Xie

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Fe-Mn-Al-C lightweight high strength steel, adding more Mn, Al and C elements into conventional AHSS, shows amazing mechanical properties, corrosion resistant and weight reduction than conventional AHSS. The mechanical properties and microstructure of Fe-15Mn-6.8Al-0.9C-0.2Ti steel after annealing process were investigated. The results show that the microstructures consisted of secondary phases TiC precipitate and ferrite in the austenite matrix. The tensile strength and elongation of the steel are 985MPa and 36%, respectively. The density is 6.86g/cm3. Continuous strain hardening behavior provides Fe-Mn-Al-C lightweight steel with perfect combination of strength and ductility.

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“…they should have high values of strength, ductility, corrosion resistance, structural stability and workability during production process, and that will add them the universal features in applications. High-strength alloys on the base of Fe-Mn-Al-C system, presenting a new group of so-called TRIPLEX alloys with high Mn and Al content, can be considered as prospective ones [1,2]. The alloys on the base of Fe-Mn-Al-C system, having high content of Al, C and Si, are characterized by specific strength comparable with specific strength of light metal alloys [3].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen in Fe–Mn–Al–C–based steels

Svyazhin¹,

Баженов²,

Капуткина³

et al. 2016

cisisr

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Nitrogen and AlN solubility in Fe-Mn-Al-N, Fe-Mn-Al-C-N and Fe-Mn-Al-Ni-C-N alloys is calculated using the methods of interaction parameters and up-to-date thermodynamic data. The obtained values of balanced nitrogen solubility in these alloys are rather close to the convergence values obtained for liquid metal according to Thermo-Calc data base. Polythermic sections of the phase diagrams of these alloys are calculated and balanced residual values of dissolved nitrogen are determined for the liquidus and solidus temperatures; these temperatures are lower than nitrogen purity limited values, achieved by the modern technologies (0.0030%) for the most investigated alloys. It is possible to obtain up to 0.010% of dissolved nitrogen in the melts Fe-20%Mn-5%Al and Fe-25%Mn-5%Al at the temperatures of steel melting and alloying by nitrogen (1550-1600 °C), while in presence of carbon and with aluminium content more than 5% this value becomes lower than nitrogen purity limited value. Nitrogen content in a solid solution depends strongly on Al and C content. If Al content is 5 %, the maximal nitrogen content in a solid solution Fe-20%Mn-Al can be equal to 9.3•10-4 % at the solidus temperature. This value does not correspond to possibilities of the up-todate industrial technologies. Thereby, AlN nitrides will form in liquid metal at micro-alloying of the steels of Fe-Mn-Al-Ni-C system by nitrogen, before and during crystallization. At the temperature lower 1100 °C, practically complete whole nitrogen is presented in the form of aluminium nitrides. It is displayed experimentally that complete nitrogen content in these alloys has effect on their strength (σ max) at hot deformation towards its elevation. In the case of warm and cold deformation, the tendency of lowering of alloys strength with increase of nitrogen content in these alloys is observed.

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Microstructural Changes in a High-Manganese Austenitic Fe-Mn-Al-C Steel

Cited by 16 publications

References 25 publications

Microstructure Characterization of Welds in X5CrNiCuNb16-4 Steel in Overaged Condition

Microstructure Characterization of Welds in X5CrNiCuNb16-4 Steel in Overaged Condition

Microstructure and mechanical properties of 980MPa grade Fe-Mn-Al-C lightweight steel

Nitrogen in Fe–Mn–Al–C–based steels

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