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Medium-carbon steel
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Proceedings Papers
HT 2019, Heat Treat 2019: Proceedings from the 30th Heat Treating Society Conference and Exposition, 106-114, October 15–17, 2019,
Abstract
PDF
Rapid induction hardening of martensitic steel can attain the very high strength levels needed for light-weighting components subjected to high operating stresses. Specimens of martensitic 0.6% C steels were heat treated using a dilatometer to investigate the effects of heating rates of 5 to 500 °C/s to temperatures of 850 to 1050 °C on the transformation to austenite and subsequent transformation to martensite during quenching. Selected specimens were quenched after partial transformation to austenite to assess the initial cementite precipitate size formed in ferrite during heating. Other specimens were isothermally held at the austenitizing temperature to assess cementite dissolution rates. Higher heating rates increased the Ac1 and Ac3 temperatures, and lowered the Ms temperature. Alloy content and prior microstructure also influenced the transformation temperatures.
Proceedings Papers
Monserrat Sofía López-Cornejo, Héctor Javier Vergara-Hernández, Pedro Garnica-González, Octavio Vázquez-Gómez, Sixtos Antonio Arreola-Villa
HT 2019, Heat Treat 2019: Proceedings from the 30th Heat Treating Society Conference and Exposition, 123-128, October 15–17, 2019,
Abstract
PDF
A hypoeutectoid steel was austenitized at 840 °C for one hour and cooled at two rates. Examination by optical and scanning electron microscopy showed a change in the pearlite microstructure. Cooling in air as compared to furnace cooling reduced the pearlite interlamellar spacing and increased the hardness. The slower cooling resulted in a lower tensile strength, higher tensile elongation, and different fracture appearance.