Isothermal Kinetic Analysis of Dissolution of The Retained Delta Ferrite in AISI 304 Stainless Steel During Homogenization
نویسندگان
1 Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
2 Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
3 Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
doi
10.22034/ijissi.2024.2027052.1287چکیده
In this investigation, the dissolution kinetics of delta ferrite in AISI-304 austenitic stainless steel during homogenization was studied. The study encompasses a temperature range of 1050 to 1250 °C (1523 K) and a time span from 1 to 12 hours, with hourly intervals. Utilizing MIP software, the delta ferrite content in the homogenized steel was quantified. The findings demonstrate a reduction in delta ferrite content as both annealing temperature and duration increase. The presence of delta ferrite in AISI-304 steel is undesirable, and homogenization proves effective in minimizing this phase, thereby enhancing mechanical properties. The dissolution of delta ferrite and chromium carbide, along with grain growth, contributes to a decrease in hardness throughout the homogenization process. Furthermore, kinetic analysis in isothermal conditions was performed to determine the parameters governing this phenomenon using the Arrhenius model. The activation energy (E) and pre-exponential factor (A) were determined to be 246.14 kJ/mol and 8.28×107 hr-1, respectively. Also, the results suggested that this process follows a two-dimensional reaction model (R2).
