Prediction of Influences of Co, Ni, and W Elements on Carbide Precipitation Behavior in Fe–C–V–Cr–Mo Based High Speed Steels

• Published in: Steel research international Vol. 89; no. 10
• Main Authors: Zhang, Hongwei, Nakajima, Keiji, Su, Mengmeng, Shibata, Hiroyuki, Hedström, Peter, Wang, Weixian, Lei, Hong, Wang, Qiang, Jönsson, Pär Göran, He, Jicheng
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.10.2018
• Subjects: Alloys; and W element addition; carbide precipitation; Carbides; Chromium; Chromium alloys; Co, Ni, and W element addition; Composition; Differential scanning calorimetry; DSC; EBSD-EDS analysis; EDS analysis; Electron back scatter diffraction; Electron backscatter diffraction; Energy dispersive spectrometers; Fe–C–V–Cr–Mo–W–Co–Ni high speed steel; High speed tool steels; High-speed steels; Iron; Isomers; Molybdenum alloys; Molybdenum base alloys; Nickel; Partial equilibrium; partial equilibrium approximation; Precipitation (chemical); Precipitation temperature; Spectrometers; Steel metallography; Thermodynamic calculations; Thermodynamic equilibrium; Tool steel; Tungsten
• ISSN: 1611-3683; 1869-344X; 1869-344X
• DOI: 10.1002/srin.201800172

The effects of Co, Ni together with W addition on the precipitation sequence, amount, and composition of carbides and FCC matrix in Fe–C–V–Cr–Mo based alloys are investigated with the help of Partial Equilibrium (PE) approximation and thermodynamic calculations as well as differential scanning calorimetry (DSC) and electron backscatter diffraction (EBSD) ‐ energy dispersive spectrometer (EDS) analyses. Results show that, individually, Co and Ni elements strengthen the matrix by their great solubility in FCC matrix; W element enlarges the hardness of the alloy through benefiting the formation of M6C carbide. Mutually, the addition of Co and Ni together with W increases the precipitation temperature of the eutectic carbides, although the addition of Co and Ni itself exerts little influence on the nature (type, amount, and composition) of the carbides. These predictions combined with the experimental verifications provide potentials for the alloy design and the property control in high speed steels. The effects of Co, Ni together with W addition on the precipitation sequence, amount, and composition of carbides and FCC matrix in Fe–C–V–Cr–Mo based high speed steels are investigated by PE approximation, DSC, and EBSD ‐ EDS analyses. Results show that the addition of Co and Ni together with W increases the precipitation temperature of the eutectic carbides.