A vanadium-bearing medium Mn heavy steel plate was designed, and the yield strength reaches around 1.0 GPa and the total elongation reaches around 18% after the annealing treatments. Meanwhile, the steel also possesses relatively good cryogenic impact toughness. Although the dislocation density of ∼2.65 × 1014 m−2 in the hot-rolled steel decreases to ∼1.13 × 1014 m−2 in both annealed steels and the volume fractions of retained austenite reach ∼7.9% and ∼13.5% for the steels annealed at 620°C for 1 and 2 h, there is no or small decrease in yield strength owing to numerous nanometer-sized carbides precipitated in martensite matrix.
This paper is part of a Thematic Issue on Medium Manganese Steels.
ShiZR, WangRZ, SuH, Effect of nitrogen content on the second phase particles in V-Ti microalloyed shipbuilding steel during weld thermal cycling. Mater Des.2016;96:241–250. doi: 10.1016/j.matdes.2016.01.111
2.
KarmakarA, MukherjeeS, KunduS, Effect of composition and isothermal holding temperature on the precipitation hardening in vanadium-microalloyed steels. Mater Charact.2017;132:31–40. doi: 10.1016/j.matchar.2017.08.003
3.
SunMS, ZhangWN, LiuZY, Effect of cooling mode on microstructure and mechanical properties in an extremely low carbon Cu bearing steel. Mater Charact.2016;120:38–44. doi: 10.1016/j.matchar.2016.08.018
4.
DasSK, SivaprasadS, DasS, The effect of variation of microstructure on fracture mechanics parameters of HSLA-100 steel. Mater Sci Eng A. 2006;431:68–79. doi: 10.1016/j.msea.2006.05.093
5.
TangZH, StumpfW.The role of molybdenum additions and prior deformation on acicular ferrite formation in microalloyed Nb–Ti low-carbon line-pipe steels. Mater Charact.2008;59:717–728. doi: 10.1016/j.matchar.2007.06.001
6.
Basiruddin SKMD, ChakrabartiD, ChatterjeeS.Microstructural engineering and strength-impact toughness prediction in ultra-low carbon bainitic steel. Mater Sci Tech.2018;34:1910–1918. doi: 10.1080/02670836.2018.1496553
7.
ChenJ, TangS, LiuZY, Microstructural characteristics with various cooling paths and the mechanism of embrittlement and toughening in low-carbon high performance bridge steel. Mater Sci Eng A. 2013;559:241–249. doi: 10.1016/j.msea.2012.08.091
8.
SongR, PongeD, RaabeD.Mechanical properties of an ultrafine grained C–Mn steel processed by warm deformation and annealing. Acta Mater.2005;53:4881–4892. doi: 10.1016/j.actamat.2005.07.009
9.
WangM, LiuZY, LiCG.Correlation of Ni contents, formation of reversed austenite and toughness for Ni-containing cryogenic steels. Acta Metall Sin.2017;30:238–249. doi: 10.1007/s40195-016-0496-9
10.
ChenJH, WangGZ, HuSH.Mechanism of detrimental effects of carbon content on cleavage fracture toughness of low-alloy steel. Metall Mater Trans A. 2001;32:1081–1091. doi: 10.1007/s11661-001-0119-5
11.
LiuHB, ZhangHQ.The Influence of carbon content and cooling rate on the toughness of Mn-Mo-Ni low-alloy steels. HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels; 2015. p. 247–252.
12.
AntolovichSD, SinghB.On the toughness increment associated with the austenite to martensite phase transformation in TRIP steels. Metall Trans.1971;2:2135–2141. doi: 10.1007/BF02917542
13.
MillerRL.Ultrafine-grained microstructures and mechanical properties of alloy steels. Metall Trans.1972;3:905–912. doi: 10.1007/BF02647665
14.
NiikuraM, MorrisJWJr. Thermal processing of ferritic 5Mn steel for toughness at cryogenic temperatures. Metall Trans A.1980;11:1531–1540. doi: 10.1007/BF02654516
15.
LeeSW, LeeHC.The mechanical stability of austenite and cryogenic toughness of ferrite Fe-Mn-Al alloys. Metall Trans A. 1993;24:1333–1343. doi: 10.1007/BF02668201
16.
GaoGH, ZhangH, GuiXL, Enhanced ductility and toughness in an ultrahigh-strength Mn-Si-Cr-C steel: the great potential of ultrafine filmy retained austenite. Acta Mater.2014;76:425–433. doi: 10.1016/j.actamat.2014.05.055
17.
XieZJ, YuanSF, ZhouWH, Stabilization of retained austenite by the two-step intercritical heat treatment and its effect on the toughness of a low alloyed steel. Mater Des.2014;59:193–198. doi: 10.1016/j.matdes.2014.02.035
18.
ChenJ, LvMY, LiuZY, Influence of heat treatments on the microstructural evolution and resultant mechanical properties in a low carbon medium Mn heavy steel plate. Metall Mater Trans A. 2016;47:2300–2312. doi: 10.1007/s11661-016-3378-x
19.
HanJ, Kwiatkowski da SilvaA, PongeD, The effect of prior austenite grain boundaries and microstructural morphology on the impact toughness of intercritically annealed medium Mn steel. Acta Mater.2017;122:199–206. doi: 10.1016/j.actamat.2016.09.048
20.
ChoiJK, LeeSG, ParkYH, HanIW, MorrisJWJr. High manganese austenitic steel for cryogenic applications. In Proceedings of the twenty-second (2012) International offshore and polar engineering Conference; Rhodes, Greece; June 17–22; 2012.
21.
SuhDW, KimSJ.Medium Mn transformation-induced plasticity steels: recent progress and challenges. Scripta Mater. 2017;126:63–67. doi: 10.1016/j.scriptamat.2016.07.013
22.
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. doi: 10.2355/isijinternational.51.651
23.
LuoHW, ShiJ, WangC, Experimental and numerical analysis on formation of stable austenite during the intercritical annealing of 5Mn steel. Acta Mater.2011;59:4002–4014. doi: 10.1016/j.actamat.2011.03.025
24.
KuzminaM, PongeD, RaabeD.Grain boundary segregation engineering and austenite reversion turn embrittlement into toughness: Example of a 9 wt.% medium Mn steel. Acta Mater. 2015;86:182–192. doi: 10.1016/j.actamat.2014.12.021
25.
HeBB, HuB, YenHW, High dislocation density-induced large ductility in deformed and partitioned steels. Sci.2017;357:1029–1032. doi: 10.1126/science.aan0177
26.
HeBB, HuangMX.Strong and ductile medium Mn steel without transformation-induced plasticity effect. Mater Res Lett.2018;6:365–371. doi: 10.1080/21663831.2018.1461141
27.
van DijkNH, ButtAM, ZhaoL, Thermal stability of retained austenite in TRIP steels studied by synchrotron X-ray diffraction during cooling. Acta Mater.2005;53:5439–5447. doi: 10.1016/j.actamat.2005.08.017
28.
UngárT, BorbélyA.The effect of dislocation contrast on x–ray line broadening: a new approach to line profile analysis. Appl Phys Lett.1996;69:3173–3175. doi: 10.1063/1.117951
29.
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. doi: 10.1016/j.actamat.2014.07.005
30.
LiY, LiW, LiuWQ, The austenite reversion and co-precipitation behavior of an ultra-low carbon medium manganese quenching-partitioning-tempering steel. Acta Mater.2018;146:126–141. doi: 10.1016/j.actamat.2017.12.035
31.
ChenJ, ZhangWN, LiuZY, The role of retained austenite on the mechanical properties of a low carbon 3Mn-1.5Ni steel. Metall Mater Trans A. 2017;48:5849–5859. doi: 10.1007/s11661-017-4362-9
32.
NakadaN, TsuchiyamaT, TakakiS, Temperature dependence of austenite nucleation behavior from lath martensite. ISIJ Int.2011;51:299–304. doi: 10.2355/isijinternational.51.299
33.
KurdjumovG, SachsG.Uber den mechanis mus der stahlhartung. Physik Z (in German). 1930;64:325–343. doi: 10.1007/BF01397346
34.
YangHS, BhadeshiaHKDH.Austenite grain size and the martensite-start temperature. Scripta Mater.2009;60:493–495. doi: 10.1016/j.scriptamat.2008.11.043
35.
ZhuYM, XuSW, NieJF.{10-11} twin boundary structures in a Mg-Gd alloy. Acta Mater.2018;143:1–12. doi: 10.1016/j.actamat.2017.09.067
