Strengthening mechanisms of a new 700MPa hot rolled Ti-microalloyed steel produced by compact strip production

Mao, Xinping; Huo, Xiangdong; Sun, Xinjun; Chai, Yizhong

doi:10.1016/j.jmatprotec.2010.05.018

Cited by 151 publications

(43 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the microstructure model, the yield strength of AHSS can be predicted as follows: 35) ....................... (7) where σ0, σs, σg and σd are the strengthening effects caused by lattice friction stress, solid solution, grain refinement and dislocation, respectively.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

See 1 more Smart Citation

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

View full text Add to dashboard Cite

Dual phase (DP) steels have been investigated using a new approach utilizing simple cold-rolling and subsequent intercritical annealing of a martensite-ferrite duplex starting structure. The ferrite grain size and volume fraction of martensite were varied by changing the rolling reduction and intercritical annealing time. Ultrafine grained DP (UFG-DP) steel with an average grain size of about 2 μm was achieved by short intercritical annealing of the 80% cold-rolled duplex microstructure. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1 100 MPa and elongation of 13%) for the new DP steel in comparison with the commercially used high strength DP980 steel. The variations in hardness, strength and elongation of the specimens with rolling reduction and intercritical holding time were correlated to microstructural characterizations. The inherent mechanism for strengthening of the DP steel was discussed and the contribution of each strengthening factor was quantitatively calculated. The results showed that the calculated yield strength (430.6 MPa) is very close to the measured value (422 MPa).

show abstract

Section: Strengthening Mechanismsmentioning

confidence: 99%

“…Mao et al 35) reported the lattice friction stress for the hot rolled Timicroalloyed steel at about 48 MPa. As it is difficult to measure the dislocation width accurately, and the width of edge dislocation is similar among AHSS, Kang et al 24) used similar value (48 MPa) in their calculations.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

View full text Add to dashboard Cite

show abstract

“…Accordingly, it is understandable that the two samples with different α grain sizes have similar yield platform widths when cooled by sand cooling as shown in figure 2. On the other hand, it is well known that fine grain size will contribute to increasing both yield strength and tensile strength [3,4,[21][22][23][24][25][26]. Thus, as shown in figure 2, the sample with the average α grain size of 6.9 µm exhibits both higher yield strength and tensile strength than that of the sample with the average α grain size of 9.7 µm.…”

Section: Effect Of Cooing Ratementioning

confidence: 99%

Cellular automaton simulation of ferrite-austenite transformation in low-carbon steels

Pan

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract.A two-dimensional (2-D) cellular automaton (CA) model is adopted to simulate ferrite (α)-austenite (γ) transformation in low-carbon steels. In the model, the preferential nucleation sites of austenite, the driving force of phase transformation coupled with thermodynamic parameters, solute partition at the α/γ interface, and carbon diffusion in both the α and γ phases are taken into consideration. The model is able to simulate the ferrite-toaustenite transformation during isothermal heating in the ferrite-austenite two-phase region, and the austenite-to-ferrite transformation during continuous cooling. The influences of cooling rate and α grain size on the final carbon concentration field are investigated. The results show that after isothermal heating at 815°C for 300 s, the carbon concentration in both the α and γ phases reach the respective equilibrium values. The simulated microstructures compare well with the SEM images. After cooling to room temperature, the carbon distribution is more uniform when cooled at 1.2°C/s than at 7°C/s. The carbon distributions for different α grain sizes cooled at 1.2°C/s are similar. The simulation results are used to understand the mechanisms of the experimental phenomena of an enameling steel.

show abstract

“…1) A large number of works aiming at continuously improving mechanical properties of micro-alloyed steels by optimizing chemical composition and thermo-mechanical processing, have been done in the past several decades. [2][3][4][5][6][7][8] Nb can effectively retard the recovery and recrystallization of deformed austenite during hot rolling, thus favoring the ferrite grain refinement, whereas V exerts less grain refinement but greater precipitation hardening since it has a higher solubility in austenite and precipitates at lower temperatures. 1,9) While for Ti addition, one of the beneficial effects in HSLA steels is the toughness improvement in the weld heat affected zone (HAZ) due to the stable Ti-richer particles formed at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Higher chemical activity of Ti results in its combination with O, N and S into larger inclusions, and higher temperature sensitivity of TiC precipitation leads to the instability of mechanical properties of steel strips. 4,5) With the development of smelting technique, however, these issues above mentioned are being solved. 4) In addition to this, Ti micro-alloying addition has received more and more attentions in recent years due to its much lower cost as compared with Nb and V additions.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Model for the Kinetics of Strain-induced Precipitation in Titanium Micro-alloyed Steels

et al. 2012

Self Cite

View full text Add to dashboard Cite

This paper presents an analytical model to describe the precipitation kinetics during isothermal holding following high temperature deformation in Ti micro-alloyed steels. This model was based on the classical nucleation and growth theory (CNGT) and Avrami equation. Using this model, the precipitation-timetemperature (PTT) diagrams for the kinetics of precipitation were easily obtained, and results show a good agreement between the experimental observation and the predictions of the model in terms of the characteristics of the PTT curves, including the shape and nose temperature and chemical composition dependence.

show abstract

Strengthening mechanisms of a new 700MPa hot rolled Ti-microalloyed steel produced by compact strip production

Cited by 151 publications

References 10 publications

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

Cellular automaton simulation of ferrite-austenite transformation in low-carbon steels

An Analytical Model for the Kinetics of Strain-induced Precipitation in Titanium Micro-alloyed Steels

Contact Info

Product

Resources

About