Effect of solidification rate on microstructure and toughness of Ca-Ti modified high boron high speed steel

Ren, Xiangyi; Fu, Hanguang; Xing, Jianfeng; Yi, Yanliang

doi:10.1016/j.msea.2018.10.087

Cited by 27 publications

(8 citation statements)

References 28 publications

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“…Scanning electron microscopy (SEM, SU3500, Hitachi, Tokyo, Japan) was used to observe the microstructure of Mo 2 FeB 2 -based cermets and bending fracture surface morphology. The particle size and sphericity of Mo 2 FeB 2 hard phase were measured via Image analysis software (Image Pro Plus, Version 6.0, Media Cybernetics, Rockville, MD, USA) [32][33][34]. The measurement methods and calculation formulas are provided in supplementary information.…”

Section: Characterizationmentioning

confidence: 99%

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

et al. 2020

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Four series of Mo2FeB2-based cermets with Ti contents between 0 wt.% and 1.5 wt.% in 0.5 wt.% increments were prepared by in situ reaction and liquid phase sintering technology. Influences of Ti on microstructure and mechanical properties of cermets were studied. It was found that Ti addition increases formation temperatures of liquid phases in liquid-phase stage. Ti atoms replace a fraction of Mo atoms in Mo2FeB2 and the solution of Ti atoms causes the Mo2FeB2 crystal to be equiaxed. In addition, the cermets with 1.0 wt.% Ti content exhibit the smallest particle size. The solution of Ti atoms in Mo2FeB2 promotes the transformation of Mo2FeB2 particles from elongated shape to equiaxed shape. With Ti content increasing from 0 wt.% to 1.5 wt.%, the hardness and transverse rupture strength (TRS) first increase and then decrease. The maximum hardness and TRS occur with 1.0 wt.% Ti content. However, the fracture toughness decreases as Ti content increases. The cermets with 1.0 wt.% Ti content show excellent comprehensive mechanical properties, and the hardness, fracture toughness, and TRS are HRA 89.5, 12.9 MPa∙m1/2, and 1612.6 MPa, respectively.

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Section: Characterizationmentioning

confidence: 99%

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

et al. 2020

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“…Polished specimens for volume fraction calculations needed to be dyed using Carlin corrosive. The volume fraction reflects the amount of borocarbide [30,31], which can be directly calculated by the image analyzing software, ImageJ. According to the stereological formula (1), volume fraction V V could be replaced by area fraction A A in the microstructure image.…”

Section: Characterizationmentioning

confidence: 99%

Research on Properties of Borocarbide in High Boron Multi-Component Alloy with Different Mo Concentrations

Ren

Han

et al. 2021

Materials

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In this work, the microstructure, alloying element distribution, and borocarbide mechanical properties of high-boron multi-component alloy with Fe-2.0 wt.%B-0.4 wt.%C-6.0 wt.%Cr-x wt.%Mo-1.0%Al-1.0 wt.%Si-1.0 wt.%V-0.5 wt.%Mn (x = 0.0, 2.0, 4.0, 6.0, 8.0) are investigated. The theoretical calculation results and experiments indicate that the microstructure of high-boron multi-component alloy consists of ferrite, pearlite as a matrix and borocarbide as a hard phase. As a creative consideration, through the use of first-principles calculations, the comprehensive properties of borocarbide with different molybdenum concentrations have been predicted. The calculations of energy, state density, electron density and elastic constant of Fe2B crystal cell reveal that substitution of the molybdenum atom in the Fe2B crystal cell can remarkably improve its thermodynamic stability, bond strength, and covalent trend. For verifying the accuracy of this theoretical calculation, nano-indentation testing is carried out, the results of which indicate that the actual properties of borocarbide present favorable consistency with the theoretical calculations.

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“…The JB30A impact testing device (Hansheng Precision machinery Co. Ltd., Dongguan, China) was used to measure the impact toughness tests of heat-treated specimens. The quantitative analysis includes volume fraction V V , shape factor K and Feret diameter dF [53,54]. Software ImageJ (1.49v, National Institutes of Health, Bethesda, MD, USA) can be used to realize the quantitative analysis.…”

Section: Analysis and Characterizationmentioning

confidence: 99%

“…It is seen that structure of TiC, austenite is a face-centered cube (fcc) and Fe 2 B is a body-centered tetragonal structure, the lattice parameter of which is presented in Table 5. The misfit degree δ is calculated by the formula as follows [54]:…”

Section: Analysis Of Titanium-modifying Mechanisms In High-boron Multi-component Alloymentioning

confidence: 99%

Effect of Titanium Modification on Microstructure and Impact Toughness of High-Boron Multi-Component Alloy

Ren

Tang

et al. 2021

Metals

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This work investigated the microstructure and mechanical property of high-boron multi-component alloy with Fe, B, C, Cr, Mo, Al, Si, V, Mn and different contents of Ti. The results indicate that the as-cast metallurgical microstructure of high-boron multi-component alloys consist of ferrite, pearlite and borocarbide. In an un-modified alloy, continuous reticular structure of borocarbide is observed. After titanium addition, the structure of borocarbide changes into a fine and isolated morphology. TiC is the existence form of titanium in the alloy, which acts as the heterogeneous nuclei for eutectic borocarbide. Moreover, impact toughness of the alloy is remarkably improved by titanium modification.

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Effect of solidification rate on microstructure and toughness of Ca-Ti modified high boron high speed steel

Cited by 27 publications

References 28 publications

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

Research on Properties of Borocarbide in High Boron Multi-Component Alloy with Different Mo Concentrations

Effect of Titanium Modification on Microstructure and Impact Toughness of High-Boron Multi-Component Alloy

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