Strain-induced precipitation in Ti microalloyed steel by two-stage controlled rolling process

Chen, Songjun; Li, Liejun; Peng, Zhe; Huo, Xiangdong; Gao, Jixiang

doi:10.1016/j.jmrt.2020.11.040

Cited by 29 publications

(10 citation statements)

References 36 publications

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“…The kinetic model is based on the following assumptions: (1) MC particles nucleate on the dislocation line, and the nucleation rate rapidly decays to zero; (2) the edge dislocation is considered as the nucleation positions of precipitated particles; (3) the shape of precipitation is considered to spheroid. Then, the interfacial energy and driving force of (Ti, Mo)C and (Ti, Mo, V) can be expressed as [ 24 , 25 , 26 ]:

where the meanings and units of different symbols are shown in Table 2 . The nucleation rate and precipitation start time of precipitates in different temperatures can be calculated by Formulas (7) and (8), respectively [ 15 , 24 , 25 , 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…Then, the interfacial energy and driving force of (Ti, Mo)C and (Ti, Mo, V) can be expressed as [ 24 , 25 , 26 ]:

where the meanings and units of different symbols are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

“…The kinetic model in ferrite needs to introduce shape factors η , whereas d * and Δ G * are transformed into d d * and Δ G d * . Therefore, Equations (7) and (8) have been changed to Equations (12) and (13), respectively [ 24 , 25 , 26 ].

where the meanings and units of different symbols are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

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Effect of V on the Precipitation Behavior of Ti−Mo Microalloyed High-Strength Steel

Han

Yang

et al. 2022

Materials

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In this work, the precipitates in Ti−Mo−V steel were systematically characterized by high-resolution transmission electron microscopy (HRTEM). The thermodynamics and kinetics of precipitates in Ti−Mo and Ti−Mo−V steels were theoretically analyzed, and the effect of vanadium on the precipitation behavior was clarified. The results showed that the precipitation volume fraction of the Ti−Mo−V steel was significantly higher than that of Ti−Mo steel. The randomly dispersed precipitation and interphase precipitation (Ti, Mo, V)C particles coexisted in the Ti−Mo−V steel. When the temperature was higher than 872 °C, the addition of vanadium could increase the driving force for (Ti, Mo, V)C precipitation in austenite, resulting in an increased nucleation rate and shortened incubation period, promoting the (Ti, Mo, V)C precipitation. When the temperature was lower than 872 °C, the driving force for (Ti, Mo, V)C precipitation in austenite was lower than that for (Ti, Mo)C precipitation, and the incubation period of (Ti, Mo, V)C precipitation was increased. Moreover, it was also found that the precipitated-time-temperature curve of (Ti, Mo, V)C precipitated in the ferrite region was “C” shaped, but that of (Ti, Mo)C was “ε” shaped, and the incubation period of (Ti, Mo, V)C was significantly shorter than that of (Ti, Mo)C.

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Section: Resultsmentioning

confidence: 99%

“…Then, the interfacial energy and driving force of (Ti, Mo)C and (Ti, Mo, V) can be expressed as [ 24 , 25 , 26 ]:

where the meanings and units of different symbols are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

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Effect of V on the Precipitation Behavior of Ti−Mo Microalloyed High-Strength Steel

Han

Yang

et al. 2022

Materials

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“…Furthermore, a two‐stage controlled rolling process, that is, rough rolling and finish rolling, was conducted in ultraheavy steel industrial production. [ 9 ] In the rolling process, the hot deformation of the surface and middle thickness is usually inhomogeneous, coupled with the considerable temperature gradient, making the deformation degree, deformation temperature, and strain rate parameters significantly different.…”

Section: Introductionmentioning

confidence: 99%

Comparison Study of Hot Deformation Behavior and Microstructure Evolution of Rack Steels with and without Segregation

Wang

Kan

et al. 2022

steel research int.

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In order to compare the hot deformation behavior and microstructure evolution of the rack steels with and without segregation, hot compression tests are carried out in the temperature range of 1173–1423 K and the strain rate range of 0.01–10 s−1 on a DIL805A/D quenching and deformation dilatometer. The flow stress, constitutive relation, processing map, and microstructure characterization are investigated. The results show that the flow stress increases with the increase of strain rate and the decrease of deformation temperature. The calculated activation energy (Q) and stress exponent (n) for the segregated samples are 395.245 kJ mol−1 and 6.046, which are higher than segregated samples, showing 376.815 kJ mol−1 and 5.930. The processing maps show that the workability of the nonsegregated steel is significantly more excellent than segregated steel. The segregated steel shows a higher kernel average misorientation angle and local strain. Complete dynamic recrystallization occurs at a high strain rate, and high deformation temperature can refine the grains.

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“…Nb, Ti and V, up to about 0.1%. These steels are characterized also by an increased concentration of N, and in the case of steel for quenching and tempering also up to 0.005% B -increasing the hardenability [12][13][14][15][16]. Metallic microadditions in the interaction with C and N form stable MX-type interstitial phases with a NaCl network, which makes it possible to manufacture steel products with a fi ne-grained structure, giving them high strength and guaranteed resistance to cracking.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Precipitation Process of Complex Carbonitride TixV1-xCyN1-y in HSLA-Type Steel

Opiela¹,

Wojtacha²

2022

Adv. Sci. Technol. Res. J.

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The paper presents a detailed analysis of the MX-type interstitial phase precipitation process and a thermodynamic analysis of the Ti x V 1-x C y N 1-y carbonitride precipitation in austenite. The subject of research analysis was the newly developed HSLA-type steel containing 0.175% C, 1.02% Si, 1.87% Mn, 0.0064% N, 0.22% Mo, and microadditions 0.022% V and 0.031% Ti. Analysis of the process of precipitation of MX interstitial phases under thermodynamic equilibrium conditions proved that the fi rst phase that precipitates in the austenite of the tested steel is TiN-type nitride. The onset temperature of this phase was 1450 °C. Subsequently, carbides of the TiC-type, VN-type nitrides and VC-type carbides, for which the precipitation onset temperatures were 1180 °C, 870 °C and 775 °C will be released, respectively. The analysis of the precipitation process of the complex carbonitride in austenite under thermodynamic equilibrium conditions was based on the Hillert and Staff ansson model, developed by Adrian, with the use of the CarbNit computer program. The beginning of carbonitride precipitation with the stoichiometric composition Ti 0.985 V 0.015 C 0.073 N 0.927 occurred at the temperature of 1394 °C. At 850 °C practically all of the Ti is bound in the carbonitride of the stoichiometric composition Ti 0.883 V 0.117 C 0.378 N 0.622 . At the same temperature, a signifi cant part of microaddition V will be dissolved in austenite, which means that vanadium will have a lesser eff ect on the formation of a fi ne-grained austenite structure, but more strongly on the precipitation hardening of steel by the dispersion VN and V particles (C, N) released during the cooling of the products.

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Strain-induced precipitation in Ti microalloyed steel by two-stage controlled rolling process

Cited by 29 publications

References 36 publications

Effect of V on the Precipitation Behavior of Ti−Mo Microalloyed High-Strength Steel

Effect of V on the Precipitation Behavior of Ti−Mo Microalloyed High-Strength Steel

Comparison Study of Hot Deformation Behavior and Microstructure Evolution of Rack Steels with and without Segregation

Thermodynamic Analysis of Precipitation Process of Complex Carbonitride TixV1-xCyN1-y in HSLA-Type Steel

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