In the automotive industry, the current development trend of lightweight and low-emission vehicles requests for high-performance materials. Benefiting from an excellent balance of mechanical properties and production cost, medium-Mn steels have attracted extensive interest by materials scientists. Austenite-reverted-transformation annealing plays a vital role in stabilisation of retained austenite and grain refinement, resulting in a considerable amount of retained austenite. Localised deformation phenomenon is usually observed in the ultrafine-grained medium-Mn steels owing to the absence of strain hardening. The occurrence of transformation-induced-plasticity and/or twinning-induced-plasticity effect in austenite improves strain hardening effectively. In the current review, austenite-reverted-transformation annealing treatment routine, mechanical properties and deformation mechanisms and effect of heat treatment on microstructure and mechanical properties of medium-Mn steels are summarised.
This review was submitted as part of the 2017 Materials Literature Review Prize of the Institute of Materials, Minerals and Mining run by the Editorial Board of MST. Sponsorship of the prize by TWI Ltd is gratefully acknowledged
MatlockDK, SpeerJG, De MoorE, Recent development advanced high strength sheet steels for automotive applications: an overview. JESTECH. 2012;15:1–12.
3.
De CoomanBC, KwonO, ChinKG. State-of-the-knowledge on TWIP steel. Mater Sci Technol. 2012;28:513–527.
4.
BillurE, AltanT. Three generations of advanced high-strength steels for automotive applications, Part I. Stamp J. 2013;Nov/Dec: 16–17.
5.
SongW, PrahlU, BleckW. Steel—ab initio: quantum mechanics guided design of new Fe-based materials. Proceedings of the 3rd World Congress on Integrated Computational Materials Engineering (ICME2015), Colorado, USA; 2015 May–June; p. 47–54.
6.
SongW, IngendahlT, BleckW. Control of strain hardening behavior in high-Mn austenitic steels. Acta Metall Sin Engl Lett. 2014;27:546–556.
7.
LanP, ZhangJ. Thermophysical properties and solidification defects of Fe–22Mn–0.7C TWIP steel. Steel Res Int. 2016;87:250–261.
8.
MillerRL. Ultrafine-grained microstructures and mechanical properties of alloy steels. Metall Trans. 1972;3:905–912.
9.
BleckW. Materials science of steel. Textbook. Aachen: IEHK; 2013.
10.
ArlazarovA, GounéM, BouazizO, Evolution of microstructure and mechanical properties of medium Mn steels during double annealing. Mater Sci Eng A. 2012;542:31–39.
11.
WangC, CaoW, ShiJ, Deformation microstructures and strengthening mechanisms of an ultrafine grained duplex medium-Mn steel. Mater Sci Eng A. 2013;562:89–95.
12.
ZhangR, CaoWQ, PengZJ, Intercritical rolling induced ultrafine microstructure and excellent mechanical properties of the medium-Mn steel. Mater Sci Eng A. 2013;583:84–88.
13.
ShiJ, SunX, WangM, Enhanced work-hardening behavior and mechanical properties in ultrafine-grained steels with large-fractioned metastable austenite. Scr Mater. 2010;63:815–818.
14.
KimSJ. Effects of manganese content and heat treatment condition on mechanical properties and microstructures of fine-grained low carbon TRIP-aided steels. Mater Sci Forum. 2010;638–642:3313–3318.
15.
HanJ, LeeSJ, JungJG, The effects of the initial martensite microstructure on the microstructure and tensile properties of intercritically annealed Fe–9Mn–0.05C steel. Acta Mater. 2014;78:369–377.
16.
ZhaoX, ShenY, QiuL, Effects of intercritical annealing temperature on mechanical properties of Fe–7.9Mn–0.14Si–0.05Al–0.07C steel. Materials. 2014;7:7891–7906.
17.
LeeS, De CoomanBC. Effect of the intercritical annealing temperature on the mechanical properties of 10 pct Mn multi-phase steel. Metall Mater Trans A. 2014;45:5009–5016.
18.
SuhDW, RyuJH, JooMS, Medium-alloy manganese-rich transformation-induced plasticity steels. Metall Mater Trans A. 2013;44:286–293.
19.
FurukawaT, HuangH, MatsumuraO. Effects of carbon content on mechanical properties of 5% Mn steels exhibiting transformation induced plasticity. Mater Sci Technol. 1994;10:964–970.
20.
De MoorE, MatlockDK, SpeerJG, Austenite stabilization through manganese enrichment. Scr Mater. 2011;64:185–188.
21.
LeeS, De CoomanBC. On the selection of the optimal intercritical annealing temperature for medium Mn TRIP steel. Metall Mater Trans A. 2014;44:5018–5024.
22.
LeeS, De CoomanBC. Tensile behavior of intercritically annealed ultra-fine grained 8% Mn multi-phase steel. Steel Res Int. 2015;86:1170–1178.
23.
HanJ, LeeSJ, LeeCY, The size effect of initial martensite constituents on the microstructure and tensile properties of intercritically annealed Fe–9Mn–0.05C steel. Mater Sci Eng A. 2015;633:9–16.
24.
LeeS, De CoomanBC. Tensile behavior of intercritically 10 pct Mn multi-phase steel. Metall Mater Trans A. 2014;45:709–716.
25.
LeeS, WooW, De CoomanBC. Analysis of the tensile behavior of 12 pct Mn multi-phase (α+γ) TWIP-TRIP steel by neutron diffraction. Metall Mater Trans A. 2016;47:2125–2140.
26.
LatypovMI, ShinS, De CoomanBC, Micromechanical finite element analysis of strain partitioning in multiphase medium manganese TWIP+TRIP steel. Acta Mater. 2016;108:219–228.
27.
HeBB, LuoHW, HuangMX. Experimental investigation on a novel medium Mn steel combining transformation- induced plasticity and twinning-induced plasticity effects. Int J Plast. 2016;78:173–186.
28.
FurukawaT. Dependence of strength-ductility characteristics on thermal history in low carbon, 5 wt.% Mn steels. Mater Sci Technol. 1989;5(5):465–470.
29.
LeeS, EstrinY, De CoomanBC. Constitutive modeling of the mechanical properties of V-added medium manganese TRIP steel. Metall Mater Trans A. 2013;44:3136–3146.
30.
LeeS, LeeK, De CoomanBC. Observation of the TWIP+ TRIP plasticity-enhancement mechanism in Al-added 6 wt pct medium Mn steel. Metall Mater Trans A. 2015;46:2356–2363.
31.
LeeS, De CoomanBC. Annealing temperature dependence of the tensile behavior of 10 pct multi-phase TWIP-TRIP steel. Metall Mater Trans A. 2014;45:6039–6052.
32.
LeeS, LeeSJ, KumarSS, Localized deformation in multiphase, ultra-fine-grained 6 pct Mn transformation-induced plasticity steel. Metall Mater Trans A. 2011;42:3638–3651.
33.
DongH, CaoW, ShiJ. Formation of an ultrafine-grained austenite-containing microstructure from a cold-rolled medium-manganese steel processed using intercritical annealing. Mater Sci Forum. 2013;762:31–37.
34.
WangC, ShiJ, WangCY, Development of ultrafine lamellar ferrite and austenite duplex structure in 0.2C5Mn steel during ART-annealing. ISIJ Int. 2011;51:651–656.
35.
LuoH, ShiJ, WangC, Experimental and numerical analysis on formation of stable austenite during the intercritical annealing of 5Mn steel. Acta Mater. 2011;59:4002–4014.
36.
HanJ, LeeYK. The effects of the heating rate on the reverse transformation mechanism and phase stability of reverted austenite in medium Mn steels. Acta Mater. 2014;67:354–361.
37.
SunR, XuW, WangC, Work hardening behavior of ultrafine grained duplex medium-Mn steels processed by ART-annealing. Steel Res Int. 2012;83(4):316–321.
38.
CaoWQ, WangC, ShiJ, Microstructure and mechanical properties of Fe–0.2C–5Mn steel processed by ART-annealing. Mater Sci Eng A. 2011;528:6661–6666.
39.
XuHF, ZhaoJ, CaoWQ, Heat treatment effects on the microstructure and mechanical properties of a medium manganese steel (0.2C–5Mn). Mater Sci Eng A. 2012;532:435–442.
40.
XuHF, ZhaoJ, CaoWQ, Tempering effects on the stability of retained austenite and mechanical properties in a medium manganese steel. ISIJ Int. 2012;52:868–873.
41.
GibbsPJ, De MoorE, MerwinMJ, Austenite stability effects on tensile behavior of manganese-enriched-austenite transformation-induced plasticity steel. Metall Mater Trans A. 2011;42(12):3691–3702.
42.
ZhaoC, ZhangC, CaoWQ, Variation of microstructure and mechanical properties of medium Mn steels with multiphase microstructure. Mater Sci Technol. 2016;32:63–70.
43.
LeeS, LeeK, De CoomanBC. Ultra fine-grained 6wt% manganese TRIP steel. Mater Sci Forum. 2010;654–656:286–289.
44.
LeeS-J, LeeS, De CoomanBC. Mn partitioning during the intercritical annealing of ultrafine-grained 6% Mn transformation-induced plasticity steel. Scr Mater. 2011;64:649–652.
45.
LeeS, LeeS-J, De CoomanBC. Austenite stability of ultrafine-grained transformation-induced plasticity steel with Mn partitioning. Scr Mater. 2011;65:225–228.
46.
LeeSJ, LeeS, De CoomanBC. Martensite transformation of sub-micron retained austenite in ultra-fine grained manganese transformation-induced plasticity steel. Int J Mater Res. 2013;104:423–429.
47.
HanJ, NamJ-H, LeeY-K. The mechanism of hydrogen embrittlement in intercritically annealed medium Mn TRIP steel. Acta Mater. 2016;113:1–10.
48.
AydinH, JungIH, EssadiqiE, Twinning and Tripping in 10% Mn steels. Mater Sci Eng A. 2014;591:90–96.
49.
SuG, GaoX, DuL, Influence of Mn on the corrosion behaviour of medium manganese steels in a simulated seawater environment. Int J Electrochem Sci. 2016;11:9447–9461.
50.
TsuchiyamaT, InoueT, TobataJ, Microstructure and mechanical properties of a medium manganese steel treated with interrupted quenching and intercritical annealing. Scr Mater. 2016;122:36–39.
51.
LeeS, LeeSJ, De CoomanBC. Work hardening behavior of ultrafine-grained Mn transformation-induced plasticity steel. Acta Mater. 2011;59:7546–7553.
52.
LuoH, DongH, HuangM. Effect of intercritical annealing on the Lüders strain of medium Mn transformation-induced plasticity stees. Mater Des. 2015;83:42–48.
53.
WattéP, van HumbeeckJ, AernoudtE, Strain ageing in heavily drawn eutectoid steel wires. Scr Mater. 1996;34:89–95.
54.
LeslieWC, KehAS. Aging of flat-rolled steel products as investigated by electron microscopy. Mechanical working of steel II. New York(NY): Gorden and Breach; 1965. p. 337–377.
55.
TsuchidaN, MasudaH, HaradaY, Effect of ferrite grain size on tensile deformation behavior of a ferrite-cementite low carbon steel. Mater Sci Eng A. 2008;488:446–452.
56.
KusakinP, BelyakovA, HaaseC, Microstructure evolution and strengthening mechanisms of Fe–23Mn– 0.3C–1.5Al TWIP steel during cold rolling. Mater Sci Eng A. 2014;617:52–60.
57.
SongW, ZhangW, von AppenJ, κ-phase formation in Fe–Mn–Al–C austenitic steels. Steel Res Int. 2015;86:1161–1169.
