About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Phase Transformations and Microstructural Evolution
|
Presentation Title |
Effects of Rapid Thermal Processing Parameters on the Microstructural Evolution of 4140 Steel |
Author(s) |
David Starr, Thomas John Balk |
On-Site Speaker (Planned) |
David Starr |
Abstract Scope |
Rapid thermal processing (RTP) of steels has been shown to be a cheaper and quicker alternative to a quench and temper process. RTP takes advantage of non-equilibrium heating rates with short soak times to partially dissolve carbides and limit carbon diffusion. The regions of high and low carbon concentration produce martensite and bainite, respectively. This ratio of martensite to bainite is important in finding the ideal compromise between ultimate tensile strength and ductility. Current challenges are related to understanding how processing parameters impact transformations in RTP. Initial microstructure, heating rates, and imposed strain were investigated to observe the effects of RTP on final microstructure of 4140 steel in this study. A Gleeble 3500 was used for thermo-mechanical processing and in-situ dilatometry. Optical microscopy coupled with nanoindentation was used for microstructure investigation. This work elucidates processing parameters applied during the heating stage to achieve a desired final microstructure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Iron and Steel, Phase Transformations |