|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Improving the Low-temperature Toughness of Ni-Cr-Mo Low-Alloy Steel Castings via Short Intercritical Heat Treatments
||Matt Frichtl, Sreeramamurthy Ankem
|On-Site Speaker (Planned)
Intercritical heat treatments have been shown to improve the mechanical properties of many steels through a variety of mechanisms depending on the composition and processing parameters. This ongoing study is evaluating the effect of a short intercritical heat treatment near the Ac3 of HY-80 steel to further improve its low-temperature toughness. Charpy v-notch and tensile testing results will be presented showing increased impact toughness while maintaining yield strength. Synchrotron x-ray diffraction data indicates changes to the amount, morphology, and composition of the retained austenite. Coupled CALPHAD and phase-field models of solute segregation between growing proeutectoid ferrite and austenite will be discussed to provide one explanation for increased toughness from the heat treatment by stabilizing thin austenite films in the final microstructure. The results suggest that these heat treatments may be used to toughen low-alloy steels without requiring expensive alloying or processing modifications.
||Iron and Steel, ICME, Phase Transformations