The ferrite/bainite dual-phase microstructure is obtained through controlling two-phase region temperature in the designed medium carbon steel. The influence of the two-phase region temperature on microstructure morphologies and volume fraction, as well as mechanical properties, is thoroughly studied. The microstructure at 795°C heat treatment process exhibits excellent strength and elongation. This is attributed to the increased proportion of large-angle misorientation, the better deformability between ferrite and bainite, and the TRIP effect of retained austenite. The strain hardening exponent curve of the sample subjected to the 795°C heat treatment process does not intersect with the straight-line n = e until the strain reaches the value of 0.1, which results in high tensile strength and high uniform elongation.
NourooziMMirzadehHZamaniM.Effect of microstructural refinement and intercritical annealing time on mechanical properties of high-formability dual phase steel[J]. Mater Sci Eng. 2018; 736(24):22–26. doi:10.1016/j.msea.2018.08.088.
2.
QiuJJZhangMGaoG HResearch and modeling on correlation among microstructure, yield strength and process of bainite/martensite steel[J]J Iron Steel Res Int. 2020, 27(2):834-841.https://doi.org/10.1007/s42243-020-00389-x.
3.
AlirezaKAliTKHamedMProcessing, microstructure adjustments, and mechanical properties of dual phase steels: a review[J]. Mater Sci Technol. 2021; 37(6):561–591.
4.
DengXWangZYongT.An investigation of mechanical property and three-body impact abrasive wear behavior of a 0.27% C dual phase steel[J]. Mater Des. 2013; 49:220–225. doi:10.1016/j.matdes.2013.01.024.
5.
TrevisiolCJouraniABouvierS.Effect of martensite volume fraction and abrasive particles size on friction and wear behaviour of a low alloy steel[J]. Tribol Int. 2017; 113:411–425. doi:10.1016/j.triboint.2016.11.001.
6.
ChenXJRolfeBAbdollahpoorAEffect of pro-eutectoid ferrite on subsequent bainite transformation kinetics simulation[J]. Mater Sci Technol. 2019; 35(4):429–436. doi:10.1080/02670836.2019.1569288.
7.
RaviAMKumarAHerbigM.Impact of austenite grain boundaries and ferrite nucleation on bainite formation in steels[J]. Acta Mater. 2020; 188:424–434. doi:10.1016/j.actamat.2020.01.065.
8.
HeSHHeBBZhuKY.On the correlation among dislocation density, lath thickness and yield stress of bainite[J]. Acta Mater. 2017; 135:382–389. doi:10.1016/j.actamat.2017.06.050.
9.
LiJLiuFWangSEffect of two-step bainite treatment on the morphology and texture of retained austenite and mechanical properties of austenitizing pretreated transformation-induced plasticity steel[J]. Mater Sci Eng. 2020; 771:138567.
10.
ParkKNishiyamaMNakadaN.Effect of the martensite distribution on the strain hardening and ductile fracture behaviors in dual-phase steel[J]. Mater Sci Eng. 2014; 604(16):135–141. doi:10.1016/j.msea.2014.02.058.
11.
TanXPongeDLuWCarbon and strain partitioning in a quenched and partitioned steel containing ferrite[J]. Acta Mater. 2018; 165:561–576. doi:10.1016/j.actamat.2018.12.019.
12.
IshikawaNSueyoshiHEndoS.Effect of microstructure on deformation behavior of ferrite-bainite steels[J]. Tetsu- to- Hagane. 2005; 91(11):809–815. doi:10.2355/tetsutohagane.1955.91.11.809.
13.
MinamiHIkedaHMorikawaT.Visualization of plastic strain distribution in a dual-phase steel using high-precision grid-markers[J]. Tetsu-to-Hagane. 2012; 98(6):303–310. doi:10.2355/tetsutohagane.98.303.
14.
HuperTEndoSIshikawaN.Effect of volume fraction of constituent phases on the stress-strain relationship of dual phase steels[J]. ISIJ Int. 1999; 39(3):288–294. doi:10.2355/isijinternational.39.288.
15.
NieWShangCGuanH.Microstructure control and anti-deformation behavior analysis of ferrite/bainite (F/B) dual-phase steel[J]. Acta Metal Sin. 2012; 48(3):298–306. doi:10.2355/tetsutohagane.98.320.
16.
VarshneyASangalSKunduSSuper strong and highly ductile low alloy multiphase steels consisting of bainite, ferrite and retained austenite[J]. Mater Des. 2016; 95:75–88. doi:10.1016/j.matdes.2016.01.078.
17.
IshikawaNYasudaKSueyoshiHMicroscopic deformation and strain hardening analysis of ferrite-bainite dual-phase steels using micro-grid method[J]. Acta Mater. 2015; 97:257–268. doi:10.1016/j.actamat.2015.06.037.
18.
QianLLiKHuangF.Enhancing both strength and ductility of low-alloy transformation-induced plasticity steel via hierarchical lamellar structure[J]. Scrip Mater. 2020; 183:96–101. doi:10.1016/j.scriptamat.2020.03.029.
19.
CaoLXuGDengP.Research on thermal expansion characteristics of steel[J]. Chi J Eng. 2014; 36(5):539–643. doi:10.13374/j.issn1001-053x.2014.05.011.
20.
RaviAMSietsmaJSantofimiaMJ.Bainite formation kinetics in steels and the dynamic nature of the autocatalytic nucleation process[J]. Scrip Mater. 2017; 140:82–86. doi:10.1016/j.scriptamat.2017.06.051.
21.
ZhengCRaabeD.Interaction between recrystallization and phase transformation during intercritical annealing in a cold-rolled dual-phase steel: a cellular automaton model[J]. Acta Mater. 2013; 61(14):5504–5517. doi:10.1016/j.actamat.2013.05.040.
22.
RauchG.Dislocation structure misorientations measured with an automated electron diffraction pattern indexing tool[J]. Mater Sci Eng, A. 2007; 462:5504–5517. doi:10.1016/j.msea.2005.12.112.
23.
WuPCChangCPKaoPW.The distribution of dislocation walls in the early processing stage of equal channel angular extrusion[J]. Mater Sci Eng, A. 2004; 374(1-2):196–203. doi:10.1016/j.msea.2004.02.016.
24.
BeladiHTariVTimokhinaIB.On the crystallographic characteristics of nanobainitic steel[J]. Acta Mater. 2017; 127:426–437. doi:10.1016/j.actamat.2017.01.058.
25.
ChristianJW.Simple geometry and crystallography applied to ferrous bainites[J]. Metall Trans. 1990; 21:799–803. doi:10.1007/BF02656562.
26.
NawazBYangZZhangF.Effect of intercritical temperature on the strain hardening of dual-phase bainite/ferrite steel. Mater Sci Technol. 2020; 36(14):1–7. doi:10.1080/02670836.2020.1809854.
27.
AshbyMF.The deformation of plastically non-homogeneous materials[J]. Phil Mag A. 1970; 21:399–424. doi:10.1080/14786437008238426.
28.
FeaugasX.On the origin of the tensile flow stress in the stainless steel AISI 316L at 300 K: back stress and effective stress. JActa Mater.1999; 47(13):3617–3632. doi:10.1016/S1359-6454(99)00222-0.
29.
SuCHLiQGHuangXFEffect of bainite microstructure during two-step quenching and partitioning process on strength and toughness properties of a 0.3%C bainitic steel[J]. J Iron Steel Res Int. 2018; 25:235–242. doi:10.1007/s42243-018-0032-4.
30.
HutchinsonBKomendaJRohrerGSHeat affected zone microstructures and their influence on toughness in two microalloyed HSLA steels[J]. Acta Mate. 2015; 97:380–391. doi:10.1016/j.actamat.2015.05.055.
