Effects of Annealing Conditions on the Mechanical Properties and Micro-Structures of Transformation Induced Plasticity aided Steel

摘要

The mechanical properties and micro-structure of 0.1 percent C-1.3 percent Si- 1.5 percent Mn TRIP steel were investigated. The specimens were annealed with the heat cycle of Continuous Annealing Line (CAL). Experimental results revealed that soaking temperature should be higher than 760 deg C and Over-Aging temperature should be 350-400 deg C in order to obtain high austenite volume fraction and good formability of TRIP steel. The evolution of austenite phase through the each annealing section was revealed by analyzing the water-quenched micro-structure and then the effects of each annealing section on the micro-structure were studied. Finally, from the analysis of correlation between the volume fraction of retained austenite and the elongation of annealed specimens, it was revealed that the elongation of TRIP steel has a positive correlation with the volume fraction of retained austenite.