Journal ArticleDOI
Microstructure and mechanical properties of spray formed ultrahigh-carbon steels
Jing Guo Zhang,Yi Jian Lin,Mats Hillert,Malin Selleby,Hai Sheng Shi,Biao Yan,Hao Zhang,Guang Min Luo,Xiao Jun Li,Jun Wang +9 more
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In this article, the microstructure and mechanical properties of the spray formed 1.25C-3.5Cr ultrahigh-carbon steel (UHCS) were described.Abstract:
The microstructure and mechanical properties of the spray formed 1.25C–3.0Si–1.5Cr ultrahigh-carbon steel (UHCS) were described. The 1.25C–3.0Si–1.5Cr UHCS was processed by spray forming to break up carbide networks. The fine pearlites with average interlamellar spacing of 0.20 μm was observed in the as-sprayed microstructure. The ultimate tensile strength and the pearlite spacing can be related by the Hall–Petch equation. The as-sprayed 1.25C–3.0Si–1.5Cr UHCS consisting of fine lamellar pearlites has been shown to exhibit superplastic behavior at elevated temperature. The dramatic change of microstructure from fine lamellar pearlites to equiaxed grains stabilized by spheroidized particles during superplastic deformation has been observed. The estimation on the basis of thermodynamics shows that the content of chromium of 1.54 wt.% is needed to inhibit graphite formation in the 1.25C–3.0Si–1.5Cr UHCS.read more
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Semi-solid processing of ultrahigh-carbon steel castings
TL;DR: In this paper, semi-solid processing using cooling plate technique was developed to produce a high quality ultra-high-carbon steel (UHCS) components, and the microstructure and mechanical properties were investigated as a function of fraction of solid.
Journal ArticleDOI
Processing and properties of ultrahigh-carbon (1.6%C) steel
TL;DR: In this article, an ultrahigh-carbon steel containing 1.6 ¼wt.% carbon (UHCS-1.6C) was processed to obtain ultrafine spheroidized ferrite, pearlite and tempered martensite, respectively.
Journal ArticleDOI
Microstructure of Cast Ultrahigh Carbon Steel (UHCS) Modified via Fe–Si–Mg–Ca–RE
TL;DR: In this article, the effect of modification treatment via Fe-Si-Mg-Ca-RE modifier on microstructure of ultrahigh carbon steel containing 1.5 W% C was investigated.
Journal ArticleDOI
Tribological Behavior of 1.41 wt% C Ultrahigh-carbon Steel With Quenching and Low-temperature Tempering Treatment
TL;DR: In this paper, the tribological behavior of 1.41 wt% C ultrahigh carbon steel (UHCS-1.41C) was investigated in comparison with a GCr15 bearing steel with a pin-on-disk and a two-disk tribometer at varying applied loads in ambient conditions.
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Phase equilibria, phase diagrams, and phase transformations
TL;DR: The basic concepts of thermodynamics have been discussed in detail in this paper, where a number of applications of molar Gibbs energy diagrams have been proposed. But none of them have been applied to the modeling of solution phases.
Journal ArticleDOI
Microstructure-property relations in as-extruded ultrahigh-carbon steels
TL;DR: The microstructure and mechanical properties of as-extruded ultra-high-carbon steels (UHCSs) are described in this article, where it is shown that the yield strength of UHCS bars correlates well with the interlamellar spacing, independent of extrusion temperature.
Journal ArticleDOI
Microstructure and continuous cooling transformation thermograms of spray formed GCr15 steel
TL;DR: In this paper, fine pearlite with the interspacing of 85 nm in as-sprayed samples and martensite of the width of 0.35 μm in oil-quenched samples were derived on the basis of the Hall-Petch relation.
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