Fracture Behavior and Mechanical Properties of a Thermomechanical TRIP Steel Under Simulated Heat Treatment Conditions

Published on Apr 1, 2021in Metallography, Microstructure, and Analysis
· DOI :10.1007/S13632-021-00723-Z
Sasan Hassanlou (Shahid Beheshti University), Mahmood Sameezadeh3
Estimated H-index: 3
(Shahid Beheshti University),
Majid Vaseghi7
Estimated H-index: 7
(Shahid Beheshti University)
Source
Abstract
In this research, hypereutectoid Si–Mn TRIP steel was prepared via casting method followed by thermomechanical processing and different heat treatments. Subsequently, fracture behavior and mechanical properties of the prepared steel were investigated. The time–temperature–transformation curves of the specimens were predicted by a simulation software. Their mechanical properties were studied through tensile, hardness, and impact tests. The microstructure and fracture behavior of the specimens were evaluated using an optical microscope, scanning electron microscope and fractographic analysis. Results indicated that the heat-treated sample containing a multi-phase microstructure of bainite, martensite, pearlite and retained austenite, had the highest ultimate tensile strength around 1,300 MPa. The software predictions of the heat treatments were in good accordance with the microstructural results. The samples have undergone thermomechanical process and heat treatment including isothermal transformation showed brittle behavior with intergranular and cleavage fracture surfaces. In addition, the two-stage quenching cycles resulted in dual-phase microstructure composed of martensite embedded in retained austenite with a combination of brittle and ductile fracture behavior.
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