Paper Titles
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Ultra Rapid Softening of High Strength Structural Steels by Thermomechanical Treatment
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Coarsening Behavior of Nanometer-Sized Carbides in Hot-Rolled High Strength Sheet Steel
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Microstructural Features of 'Quenching and Partitioning': A New Martensitic Steel Heat Treatment
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Thermomechanical Treatments of Ultrahigh Carbon Steels and Optimal Microstructures to Improve Toughness
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Substructure and Crystallography of Degenerate Pearlite in an Fe-C Binary Alloy
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Effect of Niobium on HAZ Microstructure and Toughness of HSLA Steels
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Mechanical and Thermal Properties of Ultra-High Carbon Steel Containing Aluminum
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Advanced Technology of Automotive Connecting Rod
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Thermomechanical Treatments of Ultrahigh Carbon Steels and Optimal Microstructures to Improve Toughness

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Abstract:

Thermomechanical processing allows the attainment of spheroidized microstructures that show improved mechanical properties. In this work, a thermomechanical processing route consisting of two steps was developed for two ultrahigh carbon steels (UHCS) containing 1.3 and 1.5%C. This route develops structures of fine spheroidized cementite particles in a fine-grained ferrite matrix. Spheroidized microstructures are formed by eutectoid carbide particles in the UHCS- 1.3C and by proeutectoid and eutectoid carbide particles in the UHCS-1.5C. In the latter steel, the proeutectoid carbide particle size is larger than the eutectoid carbide particle size. The carbide size distribution remains basically constant with austenitizing temperature for both steels. Plane-strain fracture toughness of spheroidized UHCS-1.3C is higher than for UHCS-1.5C, about 80 vs 40 MPa m1/2. These values do not vary significantly with austenitizing temperature which is attributed to the constancy of the mean proeutectoid and eutectoid carbide size.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

4826-4831

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.4826

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Online since:

March 2007

Authors:

Manuel Carsí, A. Fernández-Vicente, Oleg D. Sherby, Félix Peñalba, Oscar Ruano

Keywords:

Fracture, Thermomechanical Treatment (TMT), Ultra High Carbon Steel

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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