The determining impact of coiling temperature on the microstructure and mechanical properties of a titanium-niobium ultrahigh strength microalloyed steel: Competing effects of precipitation and bainite

Natarajan, V.V.; Challa, V.S.A.; Misra, R.D.K.; Sidorenko, D.M.; Mulholland, M.D.; Manohar, M.; Hartmann, J.E.

doi:10.1016/j.msea.2016.04.007

Cited by 19 publications

(6 citation statements)

References 19 publications

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“…Generally, the segmented rolling process is adopted for hot rolling with a combination of controlled rolling and controlled cooling for production [11]. Among them, the control of coiling temperature is the core control technology [12,13]. In order to meet the production requirements of the pickling rolling process for hot-formed steel and cold-rolled highstrength steel products, the strength of the hot-rolled product should be controlled so that it is not too high.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Mode on the Microstructure of High-Strength Steel during Hot Rolling

Liu¹,

et al. 2022

Metals

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This paper studies the effect of extreme cooling and traditional cooling on the microstructure of high-strength steel during hot rolling by adjusting the cooling process, combining the theoretical calculation and the thermal simulation experiment, and using metallographic microscope, scanning electron microscope (SEM), and electron backscattered diffraction (EBSD) analysis methods in order to solve the problem of coil collapse in the production process of high-strength steel. The research results show that compared with the traditional cooling method, the front-section fast cooling mode can rapidly cool the hot-rolled sheet to the “nose tip” temperature of the ferrite transformation of the time-temperature-phase-transition (TTT) curve, which can promote the transformation of the material to ferrite, increase the proportion of ferrite, and make the grain size of the organization finer. It helps to improve the overall mechanical properties of the material and reduce coil collapse defects. The front-section fast cooling mode achieves good results in industrial application, the proportion of coil collapse reduces from 9.363% to 0.533%, and the problem of coil collapse is significantly improved.

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Section: Introductionmentioning

confidence: 99%

Effect of Cooling Mode on the Microstructure of High-Strength Steel during Hot Rolling

Liu¹,

et al. 2022

Metals

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“…In TMCP hot rolled steel strips, the microstructure and mechanical properties are significantly influenced by the process parameters, such as rolling ratio, rolling temperature, cooling pattern, cooling rate and the coiling temperature. Among them, the influence of coiling temperature is considered to be significant [10,11].…”

Section: Introductionmentioning

confidence: 99%

The influence of final coiling temperature on the microstructure and mechanical properties of high Ti-V HSLA steels

et al. 2022

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In general, the strength-to-weight ratio is a marked property of high- strength low-alloy steel. The coiling temperature is an important process parameter in the control and improvement of final microstructure and mechanical properties. In this work, the effect of deformation and coiling temperature on microstructure and mechanical properties of high Ti- V microalloyed HSLA steels were investigated using the Gleeble 1500TM thermomechanical processing simulator. The samples were austenitised at 1150 ˚C for 300 s, then deformed in 4 passes at 1050, 1000, 950 and 900 ˚C. After final pass, the samples were cooled and isothermally held for 1800 s to simulate the coiling process at 550 and 650 ˚C. The results showed that at low coiling temperature (LCT) of 550 ˚C, the microstructures consisted of ferrite and bainite and also had higher hardness (304 HV).

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“…Hence, the addition of Ti has attracted increasing attention as a main micro-alloying element to produce high-strength steel because of its abundant resources and the low price. Some studies have attempted to investigate precipitation behaviors of Ti-bearing steels [10][11][12][13][14][15]. Funakawa and Shiozaki [1] developed a Ti-Mo-based hot-rolled steel with a yield strength over 700 MPa which was coiled at 620 • C by use of nanosized (Ti, Mo)C particles in ferrite.…”

Section: Introductionmentioning

confidence: 99%

“…Xu [12] reported that the mechanism between dislocation and precipitates for random precipitation and interphase precipitation of a Nb-Ti micro-alloyed steel which was formed at different coiling temperature, was different. Natarajan [15] studied the effect of microstructural evolution, precipitation behaviors and dislocation structure at two coiling temperature in a Nb-Ti high-strength steel. The results showed that there was insufficient time for the dissolved microalloying elements to precipitate during cooling process at high cooling rate, so precipitates mainly formed during coiling stages.…”

Section: Introductionmentioning

confidence: 99%

Influence of Coiling Temperature on Microstructure, Precipitation Behaviors and Mechanical Properties of a Low Carbon Ti Micro-Alloyed Steel

Sun

Du³

2020

Metals

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The microstructural evolution, nanosized precipitation behaviors and mechanical properties of a Ti-bearing micro-alloyed steel at different coiling temperatures were studied using optical microstructure (OM), scanning electron micrograph (SEM), transmission electron microscopy (TEM), Vickers hardness and tensile tests. When the coiling temperature was 500 °C, the specimen showed mainly bainitic structure, whereas polygonal ferrite was visible as the coiling temperature increased to 650 °C and 700 °C. The Vickers hardness of tested steel reached the maximum, which can be attributed to the largest number of nanosized precipitates in ferrite at the coiling temperature of 650 °C. A coiling temperature of 650 °C was optimal for the formation of TiC because of the high diffusion rate of alloying elements and kinetics of precipitation. In the laboratory rolling experiment, when the coiling temperature was 630 °C, the steel with yield strength of 682 ± 2.1 MPa and tensile strength of 742 ± 4.9 MPa was produced. The fine-grain strengthening and precipitation strengthening were 262 MPa and 268 MPa, respectively.

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The determining impact of coiling temperature on the microstructure and mechanical properties of a titanium-niobium ultrahigh strength microalloyed steel: Competing effects of precipitation and bainite

Cited by 19 publications

References 19 publications

Effect of Cooling Mode on the Microstructure of High-Strength Steel during Hot Rolling

Effect of Cooling Mode on the Microstructure of High-Strength Steel during Hot Rolling

The influence of final coiling temperature on the microstructure and mechanical properties of high Ti-V HSLA steels

Influence of Coiling Temperature on Microstructure, Precipitation Behaviors and Mechanical Properties of a Low Carbon Ti Micro-Alloyed Steel

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