Effect of Mo content on the thermal stability of Ti-Mo-bearing ferritic steel

Huang, Yao; Liu, Weining; Zhang, Aimin; Wang, Zhigang; Yin, Haiqing

doi:10.1007/s12613-020-2045-9

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…For example, the contribution to the yield strength of Ti-Mo steels, as shown by estimates, can reach 400 MPa and more [43,44]. At the same time, high strength corresponding to the strength class of 1180 MPa [45] is achieved due to an increase in precipitation strengthening while maintaining practically unchanged contributions corresponding to the basic level of strength of ferritic steels: solid solution hardening and hardening due to refining of ferrite grains.…”

Section: Precipitation Strengtheningmentioning

confidence: 99%

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Low-Carbon Ti-Mo Microalloyed Hot Rolled Steels: Special Features of the Formation of the Structural State and Mechanical Properties

Зайцев

Arutyunyan

2021

Metals

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Low-carbon Ti-Mo microalloyed steels represent a new generation of high strength steels for automobile sheet. Excellent indicators of difficult-to-combine technological, strength, and other service properties are achieved due to the superposition of a dispersed ferrite matrix and a bulk system of nanoscale carbide precipitates. Recently, developments are underway to optimize thermo-deformation processing for the most efficient use of phase precipitates. The review summarizes and analyzes the results of studies of mechanical properties depending on the chemical composition and parameters of hot deformation of low-carbon Ti-Mo microalloyed steels. Particular attention is paid to the features of the formation and the influence of various types of phase precipitates and the dispersion of the microstructure on mechanical properties. The advantages of Ti-Mo microalloying system and the tasks requiring further solution are shown.

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Section: Precipitation Strengtheningmentioning

confidence: 99%

“…Figure 2 shows a comparative diagram of the contributions of precipitation strengthening of low-carbon steels of different microalloying systems according to estimates carried out in [1,[38][39][40]43,44,46]. [46]), Ti-Nb (Adapted from ref.…”

Section: Precipitation Strengtheningmentioning

confidence: 99%

Low-Carbon Ti-Mo Microalloyed Hot Rolled Steels: Special Features of the Formation of the Structural State and Mechanical Properties

Зайцев

Arutyunyan

2021

Metals

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“…In addition, a large amount of (Ti, Mo)C particles and dislocation lines were observed in the martensite laths. These (Ti, Mo)C particles are composite precipitates due to the easy dissolution of Mo into the TiC [31] The dislocation lines acting as fast diffusion channels favor the formation of precipitates. [27] Furthermore, abundant needle-like ε-carbides were observed in martensite laths.…”

Section: Microstructurementioning

confidence: 99%

Influences of Quenching Temperature on the Microstructure Evolution and Strength−Toughness of a Novel Medium‐Carbon Ti−Mo‐Bearing Martensite Steel

Guan

Yuan

Yuan³

et al. 2021

steel research int.

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High-strength steels have attracted much attention in recent decades due to their positive roles in energy conservation, emission reduction, and cost reduction in the global setting. [1,2] Numerous methods have been adopted to improve the strength of steels. For example, microalloyed steels, individually or associatedly alloyed with Nb, V, and Ti, manifest better mechanical properties than other plain carbon steels. [3][4][5] The super-bainite steel proposed by Bhadeshia and coworkers [6,7] exhibits commendable properties due to the presence of nanoscale bainite structure and retained austenite. In addition, numerous works have been conducted on ultrafine-grain (UFG) steels consisting of microÀnanometer ferrite/austenite grains. [8][9][10][11][12][13][14] Especially, martensite steels are found to be promising due to their very high strength; however, the unsatisfactory toughness limits their commercial applications. [15,16] To improve the properties of martensite steels, secondary-hardening martensite steel, maraging steel, medium-carbon low-alloy martensite steel, and bainite/martensite duplex-phase high-strength steels have been successively proposed. [17][18][19][20][21][22][23][24] Kown et al. [17] prepared a new type of secondary-hardening martensite steel (0.24CÀ3.13WÀ3.07CrÀ14.18CoÀ9.83Ni) with a hardness of 55 HRC and room-temperature impact energy of <30 J. Mooney et al. [18] and Casalino et al. [19] both developed maraging steels with different Ti additions. The tensile strength was substantially improved to about 1200 MPa accomplished by a common failure elongation. Liu and coworkers [20] fabricated a novel ultrahigh-strength martensite steel with a strength of 1589À2446 MPa by quenching and tempering; however, the increased strength sacrificed the ductility of the steel. Multifarious schemes have been adopted to improve the toughness of martensite steels; unfortunately, the improvement of toughness is often accompanied by the sacrifice in strength.Very few studies reported the improved mechanical properties of medium-carbon martensite steel by simultaneous addition of Ti and Mo. In the present study, a novel TiÀMo-bearing martensite steel was developed by thermoÀmechanical control process (TMCP) and subsequent quenching and tempering (QÀT) process to optimize the strength and toughness of high-strength martensite steels. It is well known that the design of quenching temperature is crucial for the final service life of the low-alloy high-strength steels compared with isothermal holding time. A lower quenching temperature will result in an incomplete austenization for the martensite steel, whereas a higher quenching temperature leads to coarse austenite grains and deteriorates the combination property of the high-strength TiÀMo-bearing

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“…Among them, (Ti, Mo)C particles have a smaller size and higher coarsening resistance. Therefore, it is generally believed that Ti−Mo composite microalloying is more obvious to improve the properties of hot-rolled ferritic steels [ 6 , 7 , 8 ]. For instance, Funakawa et al [ 9 ] indicated that the contribution of (Ti, Mo)C particles to yield strength was estimated to be over 300 MPa, and the yield strength of steel was significantly improved.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of Mo content on the thermal stability of Ti-Mo-bearing ferritic steel

Cited by 9 publications

References 24 publications

Low-Carbon Ti-Mo Microalloyed Hot Rolled Steels: Special Features of the Formation of the Structural State and Mechanical Properties

Low-Carbon Ti-Mo Microalloyed Hot Rolled Steels: Special Features of the Formation of the Structural State and Mechanical Properties

Influences of Quenching Temperature on the Microstructure Evolution and Strength−Toughness of a Novel Medium‐Carbon Ti−Mo‐Bearing Martensite Steel

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

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