|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||High Temperature Spheroidization of Cementite in a 2C-4Cr Ultrahigh Carbon Steel.
||Matthew D. Hecht, Yoosuf N Picard, Bryan A Webler
|On-Site Speaker (Planned)
||Matthew D. Hecht
An industrial austenitizing heat treatment for an ultrahigh carbon steel (UHCS) containing 2 wt% C and 4 wt% Cr was found to modify the original as-cast microstructure of proeutectoid cementite (Fe3C) and pearlite (lamellar eutectoid cementite+ferrite) by producing isolated cementite particles. The heat treatment, consisting primarily of a hold near 1000 ˚C, is at a much higher temperature than traditional spheroidization methods which generally involve intercritical or subcritical heat treatments near the eutectoid temperature (approximately 723 ˚C). To better understand the high temperature UHCS spheroidization process, we have examined the effects of temperatures from 720-1020 ˚C and hold times of 5-90 minutes on cementite spheroidization using in situ confocal scanning laser microscopy (CSLM) and ex situ box furnace heat treatments. Phase distribution, composition, and morphology in the heat treated steel samples were characterized using scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), x-ray diffraction (XRD), and electron backscatter diffraction (EBSD) techniques.
||Planned: A print-only volume