About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Advances in Ferrous Metallurgy
|
Presentation Title |
In-situ Laser Confocal Microscopic Analysis of Phase Transformations in Cr-Ni-Mo and Cr-Mo High-strength Steels Coupled with Dilatometric Study |
Author(s) |
Viraj Ashok Athavale, Rogerio Antao Cardoso, Katelyn Kiser, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley |
On-Site Speaker (Planned) |
Viraj Ashok Athavale |
Abstract Scope |
Consequent to interdendritic segregation during solidification, chemical composition gradients in steels affect localized variations in phase transformation temperatures. Commercial software used to predict transformation temperatures does not necessarily account for such alterations. In this study, the predicted transformation temperatures were studied experimentally, utilizing high-temperature Laser Scanning Confocal Microscopy (LSCM) and Quenching Deformation Dilatometer (QDL) for two steel grades. Upon heating the specimens sufficiently above liquidus temperature, their melting-solidification behavior and solid-state phase transformation were recorded and analyzed. Secondary dendrite arm spacing (SDAS) measurements allowed for assessing the degree of interdendritic segregation. Dilatometric studies produced the austenite-to-martensite transformation temperature under different cooling rates. The findings yielded by both approaches were compared with a view to overlaying data to thermodynamic models and exploring the constituent variations in phase transformation temperature stemming from interdendritic segregation. |