Super Fine-Grained Steels.

摘要

The project aims to present the new methods for obtaining ultra-fine microstructures in HSLA steel. In this literature review, attention is given to various technical developments of steel processing, chemistry and manufacturing methods of high strength steel for plate and strips with very fine structures. The new ideas for refinement of microstructure of HSLA steels, which have been developed recently around the world, are discussed. Heavy reduction at low temperatures, especially in the two-phase region, can give a very fine-grained structure with 0.5-2 um size of ferrite grains. These steels are characterized by high strength and high toughness. In the steel making process, new treatments have been developed for inclusion-precipitate control in austenite and refinement of the final microstructure during transformation. Excellent toughness even for heavy plates can be obtained in such treated steel.