Medium manganese steel is typically fabricated from hot-rolling followed by cold-rolling and intercritical annealing processes. However, a singular process, warm-rolling, is an appealing prospect. The microstructure, mechanical properties and texture of a 8 wt-% Mn–0.08 wt-% C steel was investigated by cold-rolling followed by intercritical annealing or warm-rolling. The product from both processes exhibited a highly refined microstructure as well as a large volume fraction of austenite. However, a slightly larger volume fraction as well as a more heterogeneous austenite morphology resulted from the warm-rolling process, associated with a higher work-hardening rate. Microstructural analysis revealed intense α-fibre components due to a higher strain following the warm-rolling process as well as a considerably high-angle grain boundary number which was associated with dislocation accumulation.
This paper is part of a Thematic Issue on Medium Manganese Steels.
DeCoomanBC.High Mn TWIP steel and medium Mn steel. New York ( EUA): Elsevier; 2016. Chapter 11, Automotive steels – design, metallurgy, processing and applications; p. 317–385.
2.
ZhanW, CaoL, HuJ, Intercritical rolling induced ultrafine lamellar structure and enhanced, mechanical properties of medium Mn steel. J Iron Steel Res Int. 2014;21(5):551–558.
3.
CaiZH, DingH, XueX, Significance of control of austenite stability and three-stage work-hardening behaviour of an ultrahigh strength–high ductility combination transformation-induced plasticity steel. Scrip Mat.2013;68:865–868.
HuB, LuoH, YangF, Recent progress in medium-Mn steels made with new designing strategies, a review. J Mat Sci Tech.2017;33:1457–1464.
6.
ShaoC, HuiW, ZhangY, Microstructure and mechanical properties of hot-rolled medium-Mn steel containing 3% aluminium. Mat Sci Eng A.2017;682:45–53.
7.
FosteinN.Advanced high strength sheet steels: physical metallurgy, design, processing and properties. London: Springer; 2015.
8.
MaY.Medium-manganese steels processed by austenite-reverted transformation annealing for automotive applications. Mat Sci Tech. 2017;33(15):1713–1727.
9.
LeeSD, CoomanBC.Influence of intra-granular ferrite on the tensile behavior of intercritically annealed 12 pct Mn TWIP+TRIP steel. Met Mat Trans A. 2015;46:1012–1018.
10.
SongH, SonhS, KwakJH, Effect of austenite stability on microstructural evolution and tensile properties in intercritically annealed medium-Mn lightweight steels. Met Mat Trans A. 2016;47:2674–2685.
11.
RaabeD, PongeD, DmitrievaO, Designing ultrahigh strength steels with good ductility by combining transformation induced plasticity and martensite aging. Adv Eng Mat. 2009;11(7):547–555.
12.
HawkinsDN, ShuttleworthAA.The effect of warm-rolling on the structure and properties of a low-carbon steel. J Mech Work Tech. 1979;2:333–345.
13.
BrzuszekRK, RodriguesPCM, MottaLS, Microstructural evolution of ultra-fine-grained C–Mn steel warm-rolling and intercritical annealed. Mat Res.2002;5(3):343–348.
14.
SantosDB, BruzszekRK, RodriguesPCM, Formation of ultra-fine ferrite microstructure in warm-rolled and annealed C/Mn steel. Mat Sci Eng A. 2003;346:189–195.
15.
HuB, LuoH.A strong and ductile 7Mn steel manufactured by warm-rolling and exhibiting both transformation and twinning induced plasticity. J Alloys Comp. 2017;725:684–693.
16.
MagalhãesAS, MoutinhoID, OliveiraIR, Ultrafinegrained microstructure in a medium manganese steel after warm-rolling without intercritical annealing. ISIJ Int2017;57(6):1121–1128.
17.
RandleV.The coincidence site lattice and the ‘sigma enigma’. Mat Charac.2001;47:411–416.
18.
LeeYK, HanJ.Current opinion in medium manganese steel. Mat Sci Tech.2014;31(7):843–856.
19.
International Organization for Standardization (ISO). Steel – conversion of elongation values – part 1: carbon and low alloy steels. Geneva: ISO, 1984. Standard No ISO 2566-1 1984.
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.
22.
HumphreysFJ, HatherlyM.Recrystallization and related annealing phenomena. New York ( NY): Oxford University Press; 2005.
23.
GazderAA, CaoW, DaviesCHJ, An EBSD investigation of interstitial-free steel subjected to equal channel angular extrusion. Mat Sci Eng A. 2008;497:341–352.
24.
LeeSJ, ShinS, KwonM, Tensile properties of medium Mn steel with a bimodal UFG α + γ and coarse δ-ferrite microstructure. Met Mat Trans A. 2017;48:1678–1700.
25.
HanJ, SilvaAK, PongeD, The effects of prior austenite grain boundaries and microstructural morphology on the impact toughness of intercritically annealed medium Mn steel. Acta Mat. 2017;122:199–206.
26.
WangC, ShiJ, WangCY.Development of ultrafine lamellar ferrite and austenite duplex structure in 0.2C5Mn steel during ART-annealing. ISIJ Int. 2011;51(4):651–656.
27.
ZhaoZZ, LiangJH, ZhaoAM, Effects of the austenitizing temperature on the mechanical properties of cold-rolled medium-Mn steel system. J Alloys Comp.2017;691:51–59.
28.
ZhaoX, ZhangY, ShaoC, Thermal stability of retained austenite and mechanical properties of medium-Mn steel during tempering treatment. J Steel Res Int.2017;24:830–837.
29.
ZhangY, WangL, FindleyKO, Influence of temperature and grain size on austenite stability in medium manganese steels. Met Mat Trans. 2017;48A:2140–2149.
30.
SongC, YuH, LiL, Effect of carbon at interface of austenite on manganese segregation of low carbon and manganese steel. Mat Let.2016;174:75–78.
31.
RanaR, GibbsPJ, MoorE, A composite modeling analysis of the deformation behavior of medium manganese steels. Steel Res Int. 2015;86(10):1139–1150.
32.
ZhaoC, ZhangC, CaoW, Austenite thermal stabilization through the concentration of manganese and carbon in the 0.2C–5Mn steel. ISIJ Int. 2014;54:2875–2880.
33.
YangF, LuoH, HuaC, Effects of intercritical annealing process on microstructures and tensile properties of cold-rolled 7Mn steel. Mat Sci Eng A. 2017;685:115–122.
34.
HanJ, LeeYK.The effects of the heating rate on the reverse transformation mechanism and the phase stability of reverted austenite in medium Mn steels. Acta Mat. 2014;67:354–361.
35.
ChenJ, LvM, TangS, Correlation between mechanical properties and retained austenite characteristics in a low-carbon medium manganese alloyed steel plate. Mat Charac.2015;106:108–111.
36.
GibbsPJ, De MoorE, MerwinMJ, Austenite stability effects on tensile behaviour of manganese-enriched-austenite transformation-induced plasticity steel. Met Mat Trans A.2011;42:3691–3702.
37.
SuhDW, ParkSJ, LeeTH, Influence of Al on the microstructural evolution and mechanical behaviour of low-carbon manganese transformation-induced-plasticity steel. Met Mat Trans A.2010;41:397–408.
38.
XuHF, ZhaoJ, CaoWQ, Heat treatment effects on the microstructure and mechanical properties of a medium manganese steel (0.2C–5Mn). Mat Sci Eng A.2012;532:435–442.
39.
WangXG, WangL, HuangMX.In-situ evaluation of Lüders band associated with martensitic transformation in a medium Mn transformation-induced plasticity steel. Mat Sci Eng A.2016;674:59–63.
40.
SuhDW, RyuJH, JooMS, Medium-alloy manganese-rich transformation-induced plasticity steels. Met Mat Trans A. 2013;44A:286–293.
41.
RyuJH, KimJI, KimHS, Austenite stability and heterogeneous deformation in fine-grained transformation-induced plasticity-assisted steel. Scr Mat.2013;68:933–936.
42.
LiZC, DingH, MisraRDK, Microstructural evolution and deformation behaviour in the Fe-(6, 8.5) Mn–3Al–0.2C TRIP steels. Mat Sci Eng A. 2016;672:161–169.
43.
ChenJ, LvM, LiuZ, Combination of ductility and toughness by the design of fine ferrite/tempered martensite–austenite microstructure in a low carbon medium manganese alloyed steel plate. Mat Sci Eng A.2015;648:51–56.
44.
HeBB, HuangMX.On the mechanical stability of austenite matrix after martensite formation in a medium Mn steel. Met Mat Trans A. 2016;47:3346–3353.
45.
JonasJJ.Transformation textures associated with steel processing. Springer, 2009. Chapter 1, Microstructure and Texture in Steels; p. 3–17.
46.
RayRK, JonasJJ.Transformation textures in steels. Int Mat Rev. 1990;35(1):1–36.
47.
JimenezME, van DijkNH, ZhaoL, The effect of aluminium and phosphorus on the stability of individual austenite grains in TRIP steels. Acta Mat. 2007;57:533–543.
48.
KimT, HongKT, LeeKS.The relationship between the fracture toughness and grain boundary character distribution in polycrystalline NiAl. Intermetallic. 2003;11:33–39.
49.
WatanabeT.The potential for grain boundary design in materials development. Mat For.1988;11:284–303.
50.
CaoSQ, ZhangJX, WuJS, Effects of GBCD on cold work embrittlement of high strength interstitial free steels. Mater Des2006;27:53–57.
51.
ParkYB, LeeDN, GottsteinG.Evolution of recrystallization textures from cold-rolling textures in interstitial free steel. Mat Sci Tech. 1997;13:289–298.
52.
RydeL.Application of EBSD to analysis of microstructures in commercial steels. Mat Sci Tech.2006;22:1297–1306.
53.
SahaR, RayRK.Effects of severe cold-rolling on the texture and grain boundary character of a Ti–Nb IF steel. Mat Let. 2008; 62: 222–225.
54.
HugesDA, HansenN.High angle boundaries formed by grain subdivision mechanisms. Acta Mat. 1997;45:3871–3886.
55.
SahaR, RayRK.Microstructural and textural changes in a severely cold-rolled boron-added interstitial-free steel. Scrip Mat. 2007;57:841–844.
56.
YanH, BiH, LiX, Microstructure and texture of Nb+Ti stabilized ferritic stainless steel. Mat. Charac.2008;59:1741–1746.
