Hot compression deformation and microstructure evolution of high chromium cast iron based on canning compression

Li, Yanwei; Wang, Xiaogang; Yuan, Guofeng; Han, Peisheng; Zhu, Xiaoyu

doi:10.1007/s10853-021-06379-y

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…It is generally believed that when η is greater than 0.3, the material is prone to recrystallization during processing and has good workability. 33 The areas marked with A and B in Figure 8 represent the two peak areas with η greater than 0.3, the corresponding parameters in this area are the optimal deformation parameters. It can be seen from Figure 8 that, with the increase of strain, region A and B move to the right and upper part of the figure, respectively, indicating that when the deformation reaches a certain degree, the material is more likely to deform at high temperature and high strain rate.…”

Section: Resultsmentioning

confidence: 99%

A study on hot deformation behavior of 40Cr/Q345B bimetal

Yuan

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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The hot deformation behavior of 40Cr/Q345B bimetal during hot compression bonding was studied using the isothermal compression method. A true stress–strain curve of the bimetal was obtained and modified to eliminate the effects of friction. The results show that the flow stress increases with decreasing deformation temperature and increasing strain rate. By analyzing the relationship of stress, deformation temperature, and strain rate, the constitutive equation of 40Cr/Q345B bimetal was obtained. The hot processing maps of 40Cr/Q345B bimetal under different strains are drawn. Through microstructure characterization, 40Cr/Q345B bimetal formed metallurgical bonding under the deformation process of this study. Combined with the hot processing map, microstructure, prior austenite grain, and microhardness distribution, it is proposed that the optimal deformation parameters of 40Cr/Q345B bimetal is 1050–1150°C and 0.02–0.4 s−1.

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Section: Resultsmentioning

confidence: 99%

A study on hot deformation behavior of 40Cr/Q345B bimetal

Yuan

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Effect of Cr:Fe ratio on the mechanical properties of (Cr,Fe)7C3 ternary carbides in abrasion-resistant white cast irons

et al. 2023

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Abstract(Cr,Fe)7C3 ternary carbides constitute the majority of eutectic carbides in abrasion-resistant white cast irons. Density functional theory models have predicted these carbides to have a combination of metallic, covalent and ionic bonding, in proportions depending on the carbide’s Cr:Fe ratio. However, experimental research to validate these predictions has been lacking. This study investigates the characteristics of the carbides as a function of Cr:Fe ratio, which was manipulated from Fe-rich to Cr-rich by varying the Cr:C ratio of the bulk alloy. The carbides’ crystalline structure, hardness, Young’s modulus, fracture toughness and abrasion performance have been assessed through techniques including nano-indentation, HR-TEM and the inner circumference abrasion test (ICAT). Fe-rich M3C formed at very low bulk Cr:C ratio was found to have an orthorhombic crystal structure. In all other alloys, with Cr:C ratios above 2.7, M7C3 was formed and found to have a hexagonal structure. Hardness, Young’s modulus and calculated fracture toughness of M7C3 all increase with Cr:Fe ratio, from (Fe5,Cr2)C3 up to a maximum for (Cr4,Fe3)C3 (in 18Cr–6.8Cr:C WCI). This gave the highest hardness (22.9 GPa) and Young’s modulus (315 GPa), but also the highest fracture toughness (4.5 MPa.m0.5). The peak fracture toughness at carbide composition of (Cr4,Fe3)C3 in this study is consistent with the prediction of DFT models in the literature; while the peak hardness at the same carbide composition shows a marginal deviation from the predictions. Abrasion performance generally increased with carbide hardness and fracture toughness, with one exception: (Cr4.3,Fe2.7)C3. Although (Cr4.3,Fe2.7)C3 showed marginally lower inherent fracture toughness than (Cr4.0,Fe3.0)C3, the higher Cr:Fe carbides imparted the highest abrasion performance, associated with modified eutectic morphology.

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Hot compression deformation and microstructure evolution of high chromium cast iron based on canning compression

Cited by 2 publications

References 23 publications

A study on hot deformation behavior of 40Cr/Q345B bimetal

A study on hot deformation behavior of 40Cr/Q345B bimetal

Effect of Cr:Fe ratio on the mechanical properties of (Cr,Fe)7C3 ternary carbides in abrasion-resistant white cast irons

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