Low-Cycle Fatigue Behavior of the Novel Steel and 30SiMn2MoV Steel at 700 °C

Zhao, Chao; Zhang, Jin; Fu, Jiawei; Lian, Yong; Zhang, Zunjun; Zhang, Cheng; Huang, Jinfeng

doi:10.3390/ma13245753

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…In a previous study, a Cr–Mo–W–V HWD700 steel was developed, which exhibits a high strength as well as excellent fatigue performance at temperatures up to 700 °C strengthened by MC (M = V, Mo, W) nano‐carbides. [ 18–20 ] However, the microstructure stability of the HWD700 steel at an elevated temperature has not been extensively investigated. In this study, the microstructure stability of HWD700 steel at elevated temperatures is investigated and compared to that of the commercial H13 steel.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Stabilities of Newly Developed Hot‐Working Die Steel and H13 Steel at Elevated Temperature

Zhang

Cao

Chen

et al. 2023

steel research int.

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Hot-working die steels have an important role in the development of the industry and society, and they are widely used in industrial manufacturing due to their good mechanical properties, wear resistance and thermal resistance. [1][2][3][4] With the rapid increase in industrial and manufacturing requirements, dies need to operate under severe conditions of high temperature and pressures. The peak temperature at the surface of dies can reach even 700 °C, and exceed the tempering temperature. This inevitably leads to an evolution of the microstructure and degradation of mechanical properties, such as the hardness, strength, and thermal fatigue properties, strongly related to the service life of dies. [4,5] Therefore, the microstructure stability of hot-working die steels is of significance.The martensite lath structure is in a metastable state with a low thermal stability. The strength and hardness of the steel rapidly decrease with the recovery and disappearance of the lath structures in a martensitic steel. [6][7][8] Alloying with high levels of alloying elements is usually regarded as an effective approach to improve the thermal stability of a metallic material, but it is not a universally applicable method and is not conducive to some important properties of steels. For example, Cr is an important alloying element in a heat-resistant steel, and 9-12% Cr is usually added in the heat-resistant steel to form M 23 C 6 carbides always distributed along lath boundaries and grain boundaries to hinder their migration and recrystallization during creep. [9,10] However, the M 23 C 6 carbide is not conducive to the thermal fatigue performance and thermal stability of hot-working die steels owing to its fast coarsening. [5,11] The growth rate of M 7 C 3 in low-Cr alloys is slower than that of M 23 C 6 , which can be used as a type of precipitation pinning the microstructure interface. [12,13] Owing to the excellent thermal stability, the MC carbide can effectively hinder the recovery and recrystallization of the microstructures at temperatures lower than 600 °C. [14] Moreover, at a temperature below 0.5 T m , the deformation mechanism of steel materials is still the slip of dislocations. The stable and fine MC carbide can provide an excellent strengthening effect for the matrix under high-temperature conditions. [15,16] Therefore, the typical microstructures of hot-working die steels contain carbide forming elements such as Cr, Mo, and V to form the fine dispersed MC or M 2 C nano-carbides. [17] However, the microstructures of the present commercial hot-working die steels still becomes unstable when the temperature is increased to 600-650 °C. [6,11] In a previous study, a Cr-Mo-W-V HWD700 steel was developed, which exhibits a high strength as well as excellent fatigue performance at temperatures up to 700 °C strengthened by MC (M = V, Mo, W) nano-carbides. [18][19][20] However, the microstructure stability of the HWD700 steel at an elevated temperature has not been extensively investigated. In this study, the

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Section: Introductionmentioning

confidence: 99%

Microstructure Stabilities of Newly Developed Hot‐Working Die Steel and H13 Steel at Elevated Temperature

Zhang

Cao

Chen

et al. 2023

steel research int.

Self Cite

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“…The novel Cr-Mo-V hot work die steel has excellent high-temperature strength and thermal fatigue performance, and can improve the service life of the die. [4,5] To improve high-temperature thermal stability and thermal fatigue performance, as well as to prevent local failure caused by uneven microstructures, it is necessary to optimize the forging process parameters. Therefore, it is essential to investigate the microstructure evolution of a novel Cr-Mo-V hot work die steel during the hot deformation process.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of a Novel Cr–Mo–V Hot Work Die Steel

Zhao

Tan

Jia

et al. 2023

steel research int.

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Herein, high‐temperature hot compression tests are carried out to investigate the hot deformation behavior of a novel Cr–Mo–V hot work die steel. Meanwhile, a strain compensation Arrhenius constitutive equation is created, and the fitting correlation coefficient R between the experimental and predicted values is 0.98921, with a mean average absolute relative error (AARE) of 3.82%. According to the results, the hot deformation constitutive equation of the novel Cr–Mo–V steel can predict the flow stress of hot deformation with high accuracy. Furthermore, the equations for critical stress (strain), peak stress (strain), and Zener–Holomon parameters are constructed, and they demonstrate a satisfactory linear fit. Additionally, a hot processing map of the novel Cr–Mo–V steel is developed at strains of 0.4, 0.5, 0.6, and 0.7. By analyzing the hot processing map and viewing the microstructure, this study concludes that the optimal hot processing parameters of the novel Cr–Mo–V steel are 1050–1150 °C and 0.8–1 s−1 at a strain of 0.7, with a peak power dissipation efficiency of nearly 0.68.

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