Effect of tempering temperature on microstructure and mechanical properties of nanostructured bainitic steel

Wang, Xubiao; Liu, Changbo; Qin, Yuman; Li, Yanguo; Yang, Zhinan; Long, Xiaoyan; Wang, Mingming; Zhang, Fucheng

doi:10.1016/j.msea.2021.142357

Cited by 31 publications

(11 citation statements)

References 47 publications

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“…III). This con rm degradation of the microstructure during annealing at higher temperature -carbides precipitation and retained austenite transformation [14,17] . On the basis of dilatometric and mechanical tests the temperature of low temperature glow discharge nitriding was selected at 420°C.…”

Section: Simulation Of Nitriding Processes In Dilatometric Testsmentioning

confidence: 58%

“…It can be result of two different phenomenon. First, it is possible, that due to a relatively small concentration of carbon in blocky austenite, when the tempering temperature is in between Ms' and Bs' (new martensitic and bainitic start temperature, respectively, determined in the austenite remained after austempering process), bainitic transformation is restarted and continued in blocky austenite [11] . In this case most of the lm austenite, which is more stable, remain unchanged.…”

Section: Simulation Of Nitriding Processes In Dilatometric Testsmentioning

confidence: 99%

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Glow discharge nitriding of nanobainitic X37CrMoV5-1 steel

Skołek

Chmielarz

Marciniak

et al. 2023

Preprint

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One of the methods of improving mechanical properties of steels is nanostructuring via austempering, which leads to formation of a nanobainitic microstructure - a fine carbide-free bainitic ferrite plates with retained austenite. Due to high density of grain and interphase boundaries, this microstructure provides high tensile strength. Moreover, high amount of retained austenite guarantees high ductility and fracture toughness. However, retained austenite may also decrease hardness and wear resistance. Thus, to improve the properties of the surface an additional process is necessary. There are several methods of surface engineering which allow to produce hard diffusive layer, however most them are usually carried out at a temperature, in which nanobainite decomposes and loses its high properties. The purpose of the present work was to produce hard and wear-resistant nitrided diffusion layers on nanobainitic X37CrMoV5-1 steel surface during glow discharge nitriding, while keeping microstructure in core of the sample almost intact. Two temperatures of a nitriding were chosen. Obtained results were compared to the layers produced at quenched and tempered substrate to determine the influence of the microstructure of the substrate on the kinetics of the layer’s growth. The microstucture of the layers were described and their properties such as microhardness and wear resistance were investigated.

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Section: Simulation Of Nitriding Processes In Dilatometric Testsmentioning

confidence: 58%

Section: Simulation Of Nitriding Processes In Dilatometric Testsmentioning

confidence: 99%

Glow discharge nitriding of nanobainitic X37CrMoV5-1 steel

Skołek

Chmielarz

Marciniak

et al. 2023

Preprint

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show abstract

“…For simultaneous initiation, both explosives obey the JWL equation of state. In addition, the shock equation of state was used to describe the polymer response [21], while the Johnson–Cook strength model was used to describe the shell expansion and deformation [22]. The explosion parameters are provided in Tables 4 and 5.…”

Section: Numerical Simulationmentioning

confidence: 99%

Influence of combination of coaxial cylindrical explosives on fragmentation and shock waves of a shelled composite charge

Xiao-ming

et al. 2023

Propellants Explo Pyrotec

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This paper investigates fragmentation and shock waves generated by a novel coaxial cylindrical composite charge composed of an inner explosive, an intermediate inert material and an outer explosive widely used in tunable ammunition. Charges containing two types of explosive combinations were designed, and explosion experiments were conducted in two initiation modes: detonating only an inner explosive and detonating inner and outer explosives simultaneously. Results suggest the composite charge with higher inner-detonation velocity and lower outer-detonation velocity achieves more differentiated power output under different initiations. The differences in the average fragment mass and peak overpressure are as high as 34.5 % and 39.9 %, respectively, which are larger than 4.4 % and 8.4 % under the contrary explosive combination. On the basis of this observation, corresponding 2-D and 3-D models were simulated using AUTODYN code to investigate the evolution of the detonation waveform and detonation energy release. The numerically simulated initial shell expansion and later shock wave propagation of the composite charge agreed well with the experimental data. The errors in expansion radius and shock wave parameters (peak overpressure and specific impulse) are less than 6.6 % and 16.9 %, respectively, between the simulations and experiments. It was found that the particle velocity profile in the charge with lower outer-detonation velocity lagged behind that of the charge with higher inner-detonation velocity under inner initiation, while a wave front collision zone close to the outer charge appeared in the non-detonation layer under simultaneous initiation.

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“…During the tempering process, the single-phase martensite, formed by quenching from austenitization, in the microstructure will be transformed into sorbite, and the recovery and recrystallization of the matrix and the precipitation of a large number of carbides will significantly affect the properties of the steel. The strength of steel mainly includes the solid solution strengthening from the matrix, the precipitation strengthening from the second phase, and the fine grain strengthening, which is affected by the size of the martensite [7]. The addition of Mo facilitates the formation of more fine carbides by hindering dislocation elimination at a high temperature.…”

Section: 1composition Of Experimental Steelmentioning

confidence: 99%

Research on the design of new high-strength and high-toughness steel and its manufacturing parameters

Zuo

Liang²,

et al. 2022

J. Phys.: Conf. Ser.

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The lightweight of the steel structure can be achieved by the high strength and high toughness of steel. In this paper, the composition design and optimal manufacturing process of the experimental steel were investigated. The fine and uniform microstructure of tempered sorbite can be obtained under the conditions of TMCP (Thermo Mechanical Control Process), 920 °C quenching, and 650 °C tempering for the steel by micro-alloying with Nb, V, and Ti. The steel has properties as follows: yield strength of 1015 MPa, tensile strength of 1076 MPa, elongation of 14.5%, and -40 °C AKV 81 J. The parameters of quenching and tempering heat treatment have a decisive influence on the size and distribution of ferrite grains and precipitates of tempered sorbite.

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Effect of tempering temperature on microstructure and mechanical properties of nanostructured bainitic steel

Cited by 31 publications

References 47 publications

Glow discharge nitriding of nanobainitic X37CrMoV5-1 steel

Glow discharge nitriding of nanobainitic X37CrMoV5-1 steel

Influence of combination of coaxial cylindrical explosives on fragmentation and shock waves of a shelled composite charge

Research on the design of new high-strength and high-toughness steel and its manufacturing parameters

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