Effect of tempering temperature on the microstructure and mechanical properties of a reactor pressure vessel steel

Li, Chuanwei; Han, Lei; Luo, Xiaonan; Liu, Q.D.; Gu, Jianfeng

doi:10.1016/j.jnucmat.2016.05.017

Cited by 40 publications

(7 citation statements)

References 34 publications

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“…Figure 2(c) indicates that the size of these precipitates is about 20-50 nm, which disperse in the grain boundaries and the matrix of ferrite. According to the reports, the precipitates located at the grain boundaries and matrix mainly consist of M 23 C 6 -type, which presents a secondary hardening effects due to the uniform dispersion of carbides (Maropoulos et al , 2004; Li et al , 2016). Figure 2(d) is the corresponding selected-area electron-diffraction (SAED) pattern of the specimen, which shows symmetrical and clear electron diffraction spots attributed to Cr 23 C 6 .…”

Section: Resultsmentioning

confidence: 99%

“…While the carbides are coarsened during the tempering process, they are not effectively pinned at martensite plate boundary, and some lath ferrites are transformed into polygon ferrites [shown in Figure 2(c)]. The polygon ferrites with excellent crack propagation prevention abilities can help improve the toughness of the alloyed steel (Li et al , 2016).…”

Section: Resultsmentioning

confidence: 99%

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Tribological behaviors of precipitates reinforced Cr-Ni-Mo-V steel lubricated by water or water-silica mixture

Zhu

Zhang

et al. 2018

ILT

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Purpose This paper aims to investigate the friction and wear properties of Cr-Ni-Mo-V steel against 440C stainless steel under both water and water–silica mixture lubricant. Design/methodology/approach The Cr-Ni-Mo-V steel specimens were taken from a forged steel brake disc with the process of quenching at 900°C and tempering at 600°C. The tribological testing was performed using a contact configuration of ball-on-flat with a liquid cell according to the ASTM standard. Detailed examinations on the worn surface were analyzed using a scanning electron microscope. Findings The results indicate that the friction coefficient and friction damage of the steel sliding under water–silica mixture are higher than those under water. The friction coefficient decreases with increasing load and increases with the sliding speed for the two lubricants. The mass wear rate presents a rising trend with both sliding load and speed. The wear mechanisms of the Cr-Ni-Mo-V steel sliding under the two lubricants are oxidation wear, abrasive wear and fatigue wear. Research limitations/implications Because of the chosen tribological testing approach, the research results could not describe the tribological performance of the brake disc accurately during actual braking process of the high-speed train. Therefore, researchers are encouraged to test the proposed propositions further. Originality/value This study shows that the tribology behavior of the Cr-Ni-Mo-V steel with water or water–silica mixture lubrications helps the industrial firms and academicians to work on the wear of the brake disc in rainwater or wet environment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tribological behaviors of precipitates reinforced Cr-Ni-Mo-V steel lubricated by water or water-silica mixture

Zhu

Zhang

et al. 2018

ILT

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“…A suitable inter-critical heat treatment procedure is adopted to transform bainitic MnMoNi reactor pressure vessel steel into martensite and austenite as its constituent phases to improve initial impact toughness [2]. The consequences of changing cooling rate on the transformation of constituent phases in 20MnMoNi55 steel are also observed, whereas, during tempering, the impact of variation in temperature and holding duration on several mechanical properties of reactor pressure vessel steels are also demonstrated [3][4][5]. The present study encompasses an effect of variation in martensite fraction on the uniaxial monotonic flow behaviour of inter-critically annealed 20MnMoNi55 steel and thereby validation of representative volume element-based finite element simulation by addressing the real microstructures incorporated with constitutive material behaviour of ferrite as well as martensite derived from dislocation based hardening model.…”

Section: Introductionmentioning

confidence: 99%

A study on micro‐mechanical deformation behaviour of heat‐treated 20MnMoNi55 steel

Basu

Acharyya

Sahoo

2023

Materialwissenschaft Werkst

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“…With variations in the cooling rate, the transformation phenomena of constituent phases in 20MnMoNi55 steel were observed by Das et al 4 In addition to the above observations, a comparative study of mechanical properties with respect to variation in tempering temperature on RPV steel was also reported by several researchers. 5,6…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructural constituents and morphological characteristics on low cycle fatigue behaviour of inter-critically annealed 20MnMoNi55 steel

Basu

Acharyya

Sahoo

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The effect of varying microstructural parameters on the cyclic behaviour of dual-phase steels was studied on the basis of experimental and micromechanical finite-element simulated results. The initial bainitic morphology of as-received 20MnMoNi55 steel was transformed into ferrite and martensite through proper inter-critical heat treatment procedures. Strain-controlled low cycle fatigue tests were conducted at room temperature with different strain amplitudes at a specific strain rate of 10−3/s. The cyclic stress–strain curve, obtained through joining the peak stresses of hysteresis loops corresponding to different strain amplitude, shows an increase in strain hardening with an increase in volume fraction of martensite. Whereas the rate of cyclic softening, considering the decrease in stress amplitude with respect to elapsed cycles, increases with increasing strain amplitude. Inclusive of all affecting microstructural parameters, an original microstructure-based representative volume element associated with a crystal plasticity-based material model was adopted for conducting micromechanical finite-element simulation. In addition to several parameters associated with a crystal plasticity model, consideration of initial geometrically necessary dislocation density in constituent phases resulted in the accurate prediction of a hysteresis loop at low strain amplitude as compared with the experimental results. A variation of stress triaxiality built up in ferrite matrix with martensite fraction along with deformation inhomogeneity between ferrite and martensite was also observed through a strain partitioning phenomenon obtained from finite-element simulated results.

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Effect of tempering temperature on the microstructure and mechanical properties of a reactor pressure vessel steel

Cited by 40 publications

References 34 publications

Tribological behaviors of precipitates reinforced Cr-Ni-Mo-V steel lubricated by water or water-silica mixture

Tribological behaviors of precipitates reinforced Cr-Ni-Mo-V steel lubricated by water or water-silica mixture

A study on micro‐mechanical deformation behaviour of heat‐treated 20MnMoNi55 steel

Effect of microstructural constituents and morphological characteristics on low cycle fatigue behaviour of inter-critically annealed 20MnMoNi55 steel

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