Abstract
Tensile behavior and plastic deformation mechanisms of Fe-22.8Mn-8.48Al-0.86C low-density steel were studied in this thesis. After solution treatment 1100 °C for 1 h; the steels obtained an excellent combination in mechanical properties; with tensile strength of 757.4 MPa and total elongation of 68%; which were attributed to the existence of annealing twins in austenite. The present steel presented a multiple stage strain hardening behavior which was associated with the changes of such dislocation substructures. With the increase of strain, the gradual transition from tangled dislocations to dense dislocation walls and microbands was found in (the transmission electron microscopy) TEM microstructures. Due to the influence of the evolution of the microstructure during the deformation process, the work hardening behavior of the experimental steel shows three distinct stages.
Highlights
Automobile weight reduction is the direction of the development of modern automotive technology to meet the requirements of energy saving
Due to and the the stacking stacking fault fault energy, energy, the to the the high high content content of of alloying alloying elements elements and the austenite austenite in in the the tensile tensile deformation showed aa large large number number of of slip slip bands, bands, and and as as the the strain strain increased, increased, deformation at at room room temperature temperature showed the amount of slip bands increased and formed cross-slip slip in different directions
Fe-22.8Mn-8.48Al-0.86C steel after solid treatment at 1100 ◦ C for 1 h was austenitic with annealing twins through the austenite grain
Summary
Automobile weight reduction is the direction of the development of modern automotive technology to meet the requirements of energy saving. Austenitic high-Mn(15–30 wt%)Fe-Mn-Al-C steels show outstanding mechanical properties and are highly promising candidates for such applications [1,2,3,4]. Al is the most effective element in increasing the stacking fault energy (SFE) of austenite [5] and deformed microstructures exhibited the planar glide characteristics for high Mn-Al-C single phase steels. For fully austenitic high Mn steels, stacking fault energy (SFE) is the main determinant of its deformation mechanism [6]. A kind of high-strength plastic low-density steel (Fe-22.8Mn-8.48Al-0.86C) was developed by composition optimization. Tensile behavior and plastic deformation mechanisms of Fe22.8Mn-8.48Al-0.86C low-density steel were investigated in the present study based on SFE calculation, X-ray Diffraction (XRD), Optical Microscope (OM), Scanning Electron.
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