Corrosion and abrasion behavior of high-temperature carburized 20MnCr5 gear steel with Nb and B microalloying

He, Guoqiu; Feng, Yali; Jiang, Bo; Han, Weiping; Wang, Zhilin; Zhao, Heng; Liu, Yazheng

doi:10.1016/j.jmrt.2023.07.048

Cited by 9 publications

(1 citation statement)

References 30 publications

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“…It is composed of fine needle-like martensite (eventually bainite structure) with very finely and homogenously dispersed carbides measuring between 1 and 1.5 µm. A structure produced in this manner will not only feature advantageous strength, as demonstrated by uniaxial hot compression tests (Figure 3b), but will also exhibit superior resistance to abrasion and adhesive resistance [66]. Lange et al stated that the primary reason for predominant failure of hot forging dies is the wear of the tool surfaces [67].…”

Section: Microstructure Evaluation Using Optical and Sem Microscopymentioning

confidence: 99%

Influence of Imposed Strain on Weldability of Dievar Alloy

Izák,

Benč,

Kunčická

et al. 2024

Materials

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The presented work is focused on the influence of imposed strain on the weldability of Dievar alloy. Two mechanisms affecting the microstructure and thus imparting changes in the mechanical properties were applied—heat treatment (hardening and tempering), and rotary swaging. The processed workpieces were further subjected to welding with various welding currents. In order to characterize the effects of welding on the microstructure, especially in the heat-affected zone, and determine material stability under elevated temperatures, samples for uniaxial hot compression testing at temperatures from 600 to 900 °C, optical and scanning electron microscopy, and microhardness testing were taken. The testing revealed that, although the rotary swaged and heat-treated samples featured comparable microhardness, the strength of the swaged material was approximately twice as high as that of the heat-treated one—specifically 1350 MPa. Furthermore, it was found that the rotary swaged sample exhibited favorable welding behavior when compared to the heat-treated one, when the higher welding current was applied.

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Section: Microstructure Evaluation Using Optical and Sem Microscopymentioning

confidence: 99%

Influence of Imposed Strain on Weldability of Dievar Alloy

Izák,

Benč,

Kunčická

et al. 2024

Materials

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Microstructure, Precipitation, and Strengthening Mechanism of a High‐Strength Q1100 Heavy Steel Plate via Niobium–Boron Microalloying Technology

Gao,

Wei,

Zha

et al. 2024

steel research int.

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Herein, a niobium–boron‐bearing high‐strength Q1100 steel plate is developed through chemical composition designing and thermomechanical control process combined quenching and tempering. The microstructure, precipitation, and mechanical properties of the experimental steels for various conditions including as‐quenched and tempered at 300, 350, and 600 °C are investigated. Results show that the microstructure of the as‐quenched specimen is all martensite. The regular lath structure is still observed in the 300 and 350 °C tempering conditions, while equiaxed grains appear in the 600 °C tempering condition. With an increase in tempering temperature, the grain size of Q1100 steel slightly decreases. As tempering at 300 and 350 °C, the short rod cementites precipitate, while at 600 °C, MX (M = Nb, Ti, Mo; X = C, N) spheroidal carbide precipitates. Grain refinement strengthening and dislocation and precipitation strengthening are the main strengthening mechanisms for Q1100 steel tempered at low temperatures. Interestingly, a yield platform appears in Q1100 steel after tempering, which is mainly attributed to the combined effect of decreasing dislocation density and grain size.

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