The Effect of Two-stage Heat Treatment Temperatures on Initial and FSSWed Properties of TRIP Steels (original) (raw)
2017, international journal of iron and steel society of iran
In this paper, a 0.2 C–1.6 Mn–1.5 Si wt. % TRIP-aided cold-rolled steel sheet was fabricated and the optimal heat treatment conditions (Intercritical Annealing “IA” and Bainitic Isothermal Transformation “BIT”) were investigated to maximize the volume fraction and stability of the retained austenite. The effects of temperature on IA (770, 790 and 810 oC) and BIT (330, 350 and 370 oC) were studied via optical microscopy, SEM and XRD. Its tensile properties and formability were also evaluated. It is obtained that under conditions of 790 oC /330 oC and 770 oC /350 oC, the maximum and minimum amounts of the retained austenite resulted in a microstructure. Also, for the case which heat treated under 790 oC /330 oC condition obtained the best formability by showing the highest elongation ( more than 40%) and the case that heat treated under 810 oC /350 oC condition had the highest tensile strength (more than 800 MPa). The cases with the maximum (12.1 %) and minimum (8.1 %) volume fracti...
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