Effect of Original State on the Microstructure and Mechanical Properties of Fghaz of P92 Steel

Li, Yong; Du, Chengchao; Wang, Jiaqing

doi:10.2139/ssrn.4367636

Cited by 2 publications

(2 citation statements)

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“…In the microstructure image of group 6, as depicted in Figure 11f, the prominent characteristic is the presence of fine needle-like bainite, which significantly enhances the material's impact toughness. However, the transformation of martensite in this group is limited, resulting in a reduction in hardness [39]. Furthermore, the absence of noticeable carbide particles in this particular group is a critical factor contributing to its inferior wear resistance.…”

Section: Analysis Of Microstructurementioning

confidence: 99%

Impact of Cryogenic Treatment Process on the Performance of 51CrV4 Steel

et al. 2023

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The working load on automotive components is continuously rising, and the mechanical performance requirements for component materials are rising along with the growth trend toward light weight and high dependability in automobiles. In this study, the response characteristics of 51CrV4 spring steel were taken to be its hardness, wear resistance, tensile strength, and impact toughness. Prior to tempering, cryogenic treatment was introduced. Through the Taguchi method and gray relational analysis, the ideal process parameters were discovered. The ideal process variables were the following: a cooling rate of 1 °C/min, a cryogenic temperature of −196 °C, a holding time of 24 h, and a cycle number of three. An analysis of variance revealed that the holding time had the greatest effect on the material properties, with an effect of 49.01%. The yield limit of 51CrV4 was increased by 14.95% and the tensile strength was increased by 15.39% with this group of processes, and the wear mass loss was reduced by 43.32%. The mechanical qualities had a thorough upgrade. Microscopic analysis revealed that cryogenic treatment resulted in refinement of the martensite structure and significant differences in orientation. Additionally, bainite precipitation occurred, exhibiting a fine needle-like distribution, which positively influenced impact toughness. Analysis of the impact fracture surface showed that cryogenic treatment led to an increase in dimple diameter and depth. Further analysis of the elements revealed that calcium (Ca) weakened the negative effect of sulfur (S) on 51CrV4 spring steel. The overall improvement in material properties provides guidance for practical production applications.

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Section: Analysis Of Microstructurementioning

confidence: 99%

Impact of Cryogenic Treatment Process on the Performance of 51CrV4 Steel

et al. 2023

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“…Moreover, many studies on P92 steel use long-term high-temperature creep tests to accelerate the simulation of microstructure transformation and performance changes during service. However, the duration of these tests is short, making it difficult to fully reflect the microstructure evolution and performance changes of P92 steel under long-term service conditions [15,16]. This significantly constrains the effective development of heat-resistant steels for ultra-supercritical units in China.…”

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Comparative study on microstructure and hardness of P92 steel before and after long service

Fu,

Luan,

Zhao

et al. 2024

J. Phys.: Conf. Ser.

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Due to its exceptional mechanical properties, the P92 steel is extensively utilized in power plants for high-temperature and high-pressure components, such as main steam and reheated steam pipes. This study aims to characterize the microstructure and Brinell hardness of domestic and imported P92 steel before and after 50 kh of service under identical conditions using SEM (scanning electron microscope), EBSD (electron back scattering diffraction), TEM (transmission electron microscope), and a Brinell hardness tester. The findings reveal that the hardness of domestic P92 steel decreases from 222 HB to 200 HB after 50,000 hours (50 kh) of service, while the imported P92 steel experiences a slight decrease from 205 HB to 203 HB. During prolonged service, the martensitic lath broadening rate in domestic P92 steel surpasses that in imported P92 steel, which primarily accounts for the significant decline in hardness. Additionally, the presence of large-sized Laves phases at matrix lath boundaries, lath bundle boundaries, and grain boundaries in both domestic and imported P92 steels also contributes to the reduction in hardness.

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Effect of Original State on the Microstructure and Mechanical Properties of Fghaz of P92 Steel

Cited by 2 publications

References 0 publications

Impact of Cryogenic Treatment Process on the Performance of 51CrV4 Steel

Impact of Cryogenic Treatment Process on the Performance of 51CrV4 Steel

Comparative study on microstructure and hardness of P92 steel before and after long service

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