Effect of molybdenum on recrystallization behavior of Fe30Mn5Al1C- x Mo lightweight austenitic steels. (June 2023)

• Record Type: Journal Article
• Authors: Sairam, Kotla; Phaniraj, M.P.; Rajesh, Korla
• Is Part Of: Scripta materialia. Number 230(2023)
• Publication Date: 2023-06
• Subjects: Lightweight austenitic steels -- Static recrystallization -- Electron back scatter diffraction (EBSD) -- Micro-indentation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2023.115399
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Lightweight austenitic steels are among the materials of interest which can potentially reduce the CO2 emissions and improve the fuel efficiency in automotive sector. Understanding the recrystallization behavior of these steels would open the door for a spectrum of structural applications that need a strength-ductility balance. In the present work, the recrystallization behavior of cold rolled Fe-30Mn-5Al-1C- (0–3 wt%) Mo austenitic steels after annealing at 600–1200 °C was investigated through EBSD, FESEM, TEM and hardness. The solubility of molybdenum in austenite and the equilibrium phases is determined through thermodynamic calculations. Alloying with more than 0.5 wt% Mo increased the recrystallization temperature by ∼ 100 °C. M2 C type carbides precipitated in 2-Mo and 3-Mo alloys leading to grain refinement and delay in recrystallization. The hardness increased with increase in Mo content and decreased with increase in annealing temperature. At 1200 °C, due to grain growth all the alloys have similar grain size and hardness. Graphical abstract: Image, graphical abstract