ABSTRACT
The effects of deformation temperature on phase transformation and microstructure in nanostructured bainite steel were studied. The results indicate that the deformed austenite with a strain of 0.3 at 300°C presents accelerated kinetics of bainitic transformation. However, the amount of bainite in ausformed austenite then reduces with the increase in deformation temperature. A critical deformation temperature, determining whether the bainitic transformation can be promoted, was found in deformed austenite. In addition, the thickness of bainite plate in deformed austenite reduces with the decrease in ausforming temperature. The adjacent bainite ferrite plates grow up interactively, and the intersection angle is about 60–73°. A lower ausforming temperature contributes to a more serious cross-growth phenomenon of bainite plates.
Acknowledgements
The authors gratefully acknowledge the financial supports from the National Nature Science Foundation of China (Nos.51704217, 51874216), China Postdoctoral Science Foundation (2017M622533), the Major Projects of Technological Innovation in Hubei (No.2017AAA116), Hebei Joint Research Fund for Iron and Steel (E2018318013).
Disclosure statement
No potential conflict of interest was reported by the authors.