“Flash” Annealing in a Cold‐Rolled Low Carbon Steel Alloyed with Cr, Mn, Mo, and Nb: Part II—Anisothermal Recrystallization and Transformation Textures

Abstract

The aim of the present investigation is to study the microstructure and texture evolution in a cold‐rolled low carbon steel subjected to continuous heating and subsequent quenching. Peak‐annealing and quenching experiments are carried out at different temperatures at three heating rates (10, 400, and 1000 °C s−1). The texture evolution in ferrite and martensite is analyzed separately via Electron Backscattered Diffraction (EBSD) measurements. It is observed that the recrystallization is virtually completed at 771 °C in samples heated at 10 °C s−1. Conversely, the recrystallization is suppressed in samples heated at rates ≥400 °C s−1. In samples heated at 10 °C s−1, the ferrite texture evolves according to the well‐known recrystallization behavior, showing a maximum in {113}<110> components, whereas in samples heated at rates ≥400 °C s−1, the texture is similar to the one of the cold‐rolled material. It is concluded that the texture evolution in martensite is strongly dependent on the evolution of recrystallization textures in ferrite. A particular grain substructure product of the interaction between the recrystallization of ferrite and massive austenite formation is observed after heating at rates ≥400 °C s−1. However, this substructure seems to have effect neither on the textures of ferrite nor on the work hardening behavior.

Simulation and characterisation of the microstructure of ultra-fast heated dual-phase steel

“…The method of Ultra-Fast Heating (UFH) is under meticulous investigation over the last years by several groups [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The phenomena that take place during this treatment intrigue the academia for their complexity and the potent microstructural mixtures that occur.…”