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Einfluss der Dehngeschwindigkeit auf das Zugverformungsverhalten von ferritisch basiertem Leichtbau‐Stahl (Fe‐3,5Mn‐0,3 C‐5Al)
Author(s) -
He Z.P.,
Yang H.Y.,
He Y.L.,
Zheng W.S.,
Guan Z.W.,
Li L.
Publication year - 2020
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201900204
Subject(s) - materials science , austenite , ultimate tensile strength , strain rate , martensite , metallurgy , plasticity , deformation (meteorology) , composite material , elongation , quenching (fluorescence) , microstructure , ductility (earth science) , annealing (glass) , creep , physics , quantum mechanics , fluorescence
Tensile deformation behavior of Fe‐3.5Mn‐0.3C‐5Al ferritic based lightweight steel was studied in a large range of strain rate (0.001 s −1 –1200 s −1 ). Microstructures of the steel before and after tension were observed. The results show that Fe‐3.5Mn‐0.3C‐5Al lightweight steel has a good strength (820 MPa) and plasticity (40 %) and exhibits excellent combinations of specific strength and ductility (>32000 MPa %) at the strain‐rate of 0.001 s −1 after annealing at 850 °C for 5 minutes then directly quenching into water. The austenite in the steel tested was transformed into α′‐martensite during the tensile deformation process. With an increase in strain rate from 0.001 s −1 to 1200 s −1 , tensile strength of the steel investigated increased from 820 MPa to 932 MPa, while its elongation first decreased from 40 % to 15 %, and then increased from 15 % to 29 %. At the strain rate of 1200 s −1 , adiabatic heating resulted in temperature rising in matrix, suppressed the transformation of austenite to α′‐martensite. Comparing with transformation induced plasticity steel, the austenite in 3.5Mn lightweight steel is obviously unstable and cannot provide progressive phase transition.