| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advancements in Steel Structural Refinement
|
| Presentation Title |
Intercritical Annealing of HY Steel to Improve Impact Toughness |
| Author(s) |
John Galuardi, Emmanuel De Moor, Kip O. Findley |
| On-Site Speaker (Planned) |
John Galuardi |
| Abstract Scope |
New heat treatments are being investigated to reduce the reject rate of large section-size castings of High Yield (HY) steel. Intercritical annealing (IA) has been used historically to improve impact toughness properties of nickel-bearing ferrous alloys by lowering the ductile-to-brittle transition temperature (DBTT) to cryogenic operating conditions. This shift in the DBTT is attributed to retained austenite (RA) films, which are stabilized to cryogenic temperatures through enrichment of Ni into austenite during IA. To explore the tenability of IA improving the impact toughness of HY steel, CALPHAD modeling, dilatometry, mechanical testing, scanning electron microscopy (SEM), and X-ray diffraction (XRD) have been performed to determine the phase fraction of RA in HY-80 and examine the joint effect of IA and tempering treatments on mechanical properties and microstructure. |