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Schlagwörter:
Austenite; Bainite; Manganese; Martensite; Martensitic steel; Mechanical properties; Quenching; Steel; Steel metallography; Tensile strength, Bainite transformations; Bainitic steel; Degradation of mechanical properties; Multiphase microstructure; Nanostructured bainites; Quenching and partitioning; Retained austenite; Structure property relationships, Bainitic transformations
Zusammenfassung:
We elucidate here the mechanistic contribution of the application of quenching and partitioning (QP) concept to a high carbon Mn-Si-Cr steel in obtaining a multiphase microstructure comprising of martensite/austenite and nanostructured bainite (bainitic ferrite and nanometer-sized film-like retained austenite) that exhibited tensile strength of 1923 MPa and total elongation of 18.3. The excellent mechanical properties are attributed to the enhanced refinement of blocky austenite islands obtained by the QP process. The austenite was stabilized by both carbon partitioning from martensite and bainite transformation. Compared with conventional heat treatment to produce nanostructured bainite, the total time is significantly reduced without degradation of mechanical properties. © 2016 Elsevier B.V.
