| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Surface Engineering VII
|
| Presentation Title |
Diffusion-induced recrystallization associated with heterogeneous elemental distributions during carburization of Ni-Cr-Fe alloys |
| Author(s) |
Farahnaz Haftlang, Maryam Kazemzadeh-Atoufi, Mark B. Davis, Deepak Kumar, Robin Ziebarth, Sandeep Dhingra, Robert D. Morgan, Peter W. Voorhees, David N. Seidman |
| On-Site Speaker (Planned) |
Farahnaz Haftlang |
| Abstract Scope |
In situ subsurface grain refinement of Ni-Cr-based alloys facilitates the formation of a protective superficial layer during high-temperature treatments, leading to an enhancement of the lifetimes of components at elevated temperatures. This is explained by rapid diffusion mediated by high densities of grain boundaries and dislocations. Immediate recovery may decelerate their contributions during the long-term heat treatment at elevated temperatures. To elucidate the possible occurrence of diffusion-induced grain boundary migration (DIGM) and its effect on carburization, a pre-oxidized Ni-Cr-Fe alloy is subjected to post-carburization at 1100 °C. The superficial layer consists of dense Cr2O3, MnO2 and SiO2. Besides the continuously thickening of the Cr2O3 layer, upward Cr diffusion results in a possible DIGM mechanism followed by recrystallization of the Cr-depleted volume. Further heat treatments result in the thickening of either the oxide layer or the Cr-depleted region, plus recovery of dislocations and grain growth in the recrystallized volume. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Surface Modification and Coatings, High-Temperature Materials, Copper / Nickel / Cobalt |