Evolution of carbides and carbon content in matrix of an ultra-high carbon sintered steel during heat treatment process |
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Authors: | Yuan-zhi Zhu Zhe Zhu Zhi-min Yin Zhi-dong Xiang |
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Affiliation: | [1]Key Laboratory of the Ministry of Education of China for Ferrous Metallurgy and Resources Utilization, Wuhan University of Science and Technology Wuhan 430081, China [2]School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China [3]School of Material Science & Engineering, Central South University, Changsha 410083, China |
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Abstract: | DTA, thermal expansion, XRD, and SEM were used to evaluate the effect of quenching temperature on the mechanical properties and microstructure of a novel sintered steel Fe-6Co-1Ni-5Cr-5Mo-1C. Lattice parameters and the mass fraction of carbon dissolved in the matrix of the steel quenched were investigated. It is discovered that the hardness of the steel increases with quench-ing temperature in the range of 840-900℃ and remains constant in the range of 900 to 1100℃. It decreases rapidly when the tem-perature is higher than 1100℃. The mass fraction of carbon dissolved in the matrix of the steel quenched at 840℃ is 0.38, but when the quenching temperature is increased to 1150℃, it increases to 0.98. The carbides formed during sintering are still present at grain boundaries and in the matrix of the steel quenched at low quenching temperatures, such as 840℃. When the quenching temperature is increased to 1150℃, most of the carbides at grain boundaries are dissolved with just a small amount of spherical M23C6 existing in the matrix of the quenched steel. |
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Keywords: | ultra-high carbon sintered steel heat treatment mechanical properties microstructure |
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