Papers by Keyword: Ultra High Carbon Steel

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Authors: Hai Sheng Shi, Guang Min Luo, Jun Fei Fan, Yi Jian Lin, Jing Guo Zhang
Abstract: The effect of hot rolling parameters on graphitization of a spray formed ultra high carbon steels(UHCSs) was described. The number of graphite stringers and graphite area fractions increased with the increase of rolling reduction. Graphite stringers nucleated at small pores and grew by carbon diffusion from adjacent austenite during hot rolling. Alloy contents, pores and hot deformation atγ+Fe3C phase range are the key factors for graphitization.The graphite stringers of UHCSs have little effect on tensile strength, but reduce the ductility at room temperature.
Authors: Donald R. Lesueur, C.K. Syn, Oleg D. Sherby, Dong Wha Kum
Authors: M. Pozuelo, Fernando Carreño, Oscar A. Ruano
Authors: C.K. Syn, D.R. Lesuer, A. Goldberg, H.C. Tsai, Oleg D. Sherby
Abstract: The properties of ultrahigh carbon steels (UHCS) are strongly influenced by aluminum additions. Hardness studies of quenched UHCS-Al alloys reveal that the temperature for the start of transformation increases with increases in aluminum content. It is shown that this change is a function of the atomic percent of solute and of the valence state when comparisons are made with UHCSs containing silicon and tin as solutes. The thermal expansion of UHCSs with dilute aluminum additions shows no discontinuity in the vicinity of the ferrite-austenite transformation temperature. This is the result of a three phase region of ferrite, carbides and austenite. The slope of the expansion curve is higher in the austenite range than in the ferrite range as a result of the dissolution of carbon in austenite with temperature. Processing to achieve a fine grain size in UHCS-Al alloys was principally by hot and warm working (HWW) followed by isothermal warm working (IWW). The high temperature mechanical properties of a UHCS-10Al-1.5C material show nearly Newtonian-viscous behavior at 900 to 10000C. Tensile elongations of 1200% without failure were achieved in the 1.5%C material. The high oxidation corrosion resistance of the UHCS-10Al materials is described.
Authors: Oleg D. Sherby, Manuel Carsí, Woo Jin Kim, Donald R. Lesueur, Oscar A. Ruano, C.K. Syn, Eric M. Taleff, Jeffrey Wadsworth
Authors: Wei Ping Lin, Ya Jun Fan, Zhan Ling Zhang, Jie Wu Zhu, Yong Ning Liu
Abstract: A ultrahigh carbon steels (UHCS) containing 1.6 wt pct carbon was studied. Through spheroidizing process by divorced-eutectoid transformation (DET), the forged microstructure was spheroidized and the microstructure was fine carbide particles distributed in ferrite matrix. Second-time heat treatment included two kinds of technologies: normalizing and quenching + tempering. Finally, the UHCS obtained ideal mechanical properties. The yield strength and tensile strength of the UHCS were higher than that of 40CrNiMo, moreover plasticity of the UHCS was equal to that of 40CrNiMo. So the UHCS was an excellent structural material.
Authors: Eiichi Sato, Shoji Furimoto, Tadashi Furuhara, Kaneaki Tsuzaki, Tadashi Maki
Authors: Jing Guo Zhang, Guang Min Luo, Xiao Jun Li, Jun Wang, Biao Yan, Yi Jian Lin, Hai Sheng Shi, Hao Zhang
Abstract: The recent investigations on spray formed ultrahigh-carbon steels (UHCSs) are reviewed. A satisfactory combination of strength and ductility in spray formed UHCSs can be obtained by hot rolling and annealing. The composition and hot rolling have a marked effect on the formation of graphite in UHCSs. The possibility of achieving high strain rate superplasticity in the spray formed UHCS was first revealed by very recent investigations in Shanghai Baosteel Research Institute. The UHCS processed by a combination of spray forming and hot rolling exhibited high strain rate superplasticity.
Authors: C.K. Syn, Donald R. Lesueur, Oleg D. Sherby, Eric M. Taleff
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