Phase Transformation and Hot Working Studies on High-Al Fe-Al-Mn-C Ferritic Low-Density Steels

Rawat, Pankaj; Prakash, U.; Prasad, V.V. Bhanu

doi:10.1007/s11665-021-05857-3

Cited by 4 publications

(3 citation statements)

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“…Carbon and manganese allow austenite formation at higher temperatures and allow the properties to be modified by heat treatment. The formation of kappa carbides in these steels instead of cementite is also observed [ 5 , 7 ]. With a suitable choice of morphology, distribution, proportion, and size, they can benefit the mechanical properties [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…The maximum proportion of aluminium that can be added to steel is 12 wt%. A higher aluminium content in steel leads to the formation of brittle intermetallic phases such as Fe 3 Al and FeAl, which leads to a deterioration in ductility [ 5 ]. When considering steels with a higher aluminium content, where phase transformations occur during cooling, it is necessary to compensate for the high aluminium content with austenite stabilising elements such as carbon and manganese to eliminate the ferritic phase [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…When sufficient manganese is added to ferritic low-density steels, austenitic steels of the Fe-C-Mn-Al type are formed, which use various strengthening mechanisms to improve properties [ 5 ]. These include shear band-induced plasticity (SIP) [ 2 ], transformation-induced plasticity (TRIP), twin-induced plasticity (TWIP) [ 13 ] and microband-induced plasticity (MBIP) [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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A New Alloying Concept for Low-Density Steels

et al. 2022

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This paper introduces a new alloying concept for low-density steels. Based on model calculations, samples—or “heats”—with 0.7 wt% C, 1.45 wt% Si, 2 wt% Cr, 0.5 wt% Ni, and an aluminium content varying from 5 to 7 wt% are prepared. The alloys are designed to obtain steel with reduced density and increased corrosion resistance suitable for products subjected to high dynamic stress during operation. Their density is in the range from 7.2 g cm−3 to 6.96 g cm−3. Basic thermophysical measurements are carried out on all the heats to determine the critical points of each phase transformation in the solid state, supported by metallographic analysis on SEM and LM or the EDS analysis of each phase. It is observed that even at very high austenitisation temperatures of 1100 °C, it is not possible to change the two-phase structure of ferrite and austenite. A substantial part of the austenite is transformed into martensite during cooling at 50 °C s−1. The carbide kappa phase is segregated at lower cooling rates (around 2.5 °C s−1).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%