Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 768, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138458
Keywords
Medium manganese steel; Prior austenite grain; Intercritical annealing; Retained austenite
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This paper presents the influence of prior austenite grain (PAG) size on the evolution of microstructure and mechanical properties in an intercritically annealed medium manganese steel (Fe- 8.1 Mn - 0.3 C- 1.1 Si- 1.5 Al). The hot forged alloy was austenitized at two different temperature-time combination to achieve the PAG size of similar to 20 mu m (sample 1) and similar to 40 mu m (sample 2). Both the samples retained a small amount of austenite after the austenitization treatment. The sample 1 with smaller PAG size stabilized a significantly higher amount of austenite (similar to 54.4 +/- 0.6 vol%) after the intercritical annealing treatment than the sample 2 (similar to 39.3 +/- 0.7 vol%). Composition as well as dimension of the austenite films were found to be different in the two samples. Sample 1 displayed a better combination of strength and ductility (1096 +/- 30 MPa and 32 +/- 4.2%, respectively) as compared to the sample 2 (1026 +/- 30 MPa and 22 +/- 1.9%, respectively). The superior mechanical properties of sample 1 were ascribed to the cumulative effect of the higher volume fraction and lower stability of retained austenite in sample 1 as compared to the sample 2. Fracture surface investigation revealed that the sample 1 experienced microvoid mediated ductile fracture, whereas sample 2 displayed brittle fracture facilitated by crack propagation along certain cleavage facets.
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