2014/08/07 by Ankit, Kumar, R. Mukherjee, Mukherjee, Rajdip +4
Engineering · #Aluminum Alloy Microstructure Properties #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Metallurgical Processes and Thermodynamics #Microstructure and Mechanical Properties of Steels #Pattern Formation and Solitons (nlin.PS)
paper · pdf · doi:10.48550/arxiv.1408.1571
openalex publication_date 2014/08/07 · openalex created_date 2022/08/12 · openalex updated_date 2026/07/28
The non-cooperative eutectoid transformation relies on the presence of\npre-existing cementite particles in the parent austenitic phase and yields a\nproduct, popularly known as the divorced eutectoid. In isothermal conditions,\ntwo of the important parameters, which influence the transformation mechanism\nand determine the final morphology are undercooling (below A1 temperature) and\ninter-particle spacing. Although, the criteria which governs the morphological\ntransition from lamellar to divorced is experimentally well established,\nnumerical studies that give a detailed exposition of the non-cooperative\ntransformation mechanism, have not been reported extensively. In the present\nwork, we employ a multiphase-field model, that uses the thermodynamic\ninformation from the CALPHAD database, to numerically simulate the pulling-away\nof the advancing ferrite-austenite interface from cementite, which results in a\ntransition from lamellar to divorced eutectoid morphology in Fe-C alloy. We\nalso identify the onset of a concurrent growth and coarsening regime at small\ninter-particle spacing and low undercooling. We analyze the simulation results\nto unravel the essential physics behind this complex spacial and temporal\nevolution pathway and amend the existing criteria by constructing a\nLamellar-Divorced-Coarsening (LDC) map.\n