Publications (2)0.77 Total impact
Article: Effect of prior austenite characteristics on mechanical properties of thermomechanically processed multiphase TRIP assisted steels[show abstract] [hide abstract]
ABSTRACT: To develop any multiphase transformation induced plasticity (TRIP) assisted steel through thermomechanical processing routes, the effects of materials and process variables are to be thoroughly identified. Accordingly, the present work was programmed to study the influence of the state of prior austenite on the subsequent transformations and the related final phase combinations. In this framework, using a low carbon TRIP assisted multiphase steel, the compression specimens were subjected to different thermomechanical processing schedules to generate different prior austenite characteristics. The results indicated that the characteristics of martensite/austenite (M/A) microcomponent in the final microstructure were dictated by the state of prior austenite. In fact, increasing prior austenite grain size led to large decrease in the amount of M/A phase and this, in turn, resulted to higher strength without sacrificing the ductility. It was also found that static recrystallisation of austenite brings about more percentage of M/A phase compared with dynamic recrystallisation.Materials Science and Technology 10/2008; 24(11):1354-1361. · 0.77 Impact Factor
Article: ANN model for prediction of the effects of composition and process parameters on tensile strength and percent elongation of Si–Mn TRIP steels[show abstract] [hide abstract]
ABSTRACT: The effects of composition and intercritical heat treatment parameters on tensile strength and percentage elongation of Si–Mn TRIP steels were modeled, using a neural network with a feed forward topology and a back propagation algorithm. It was found that a committee of nets models the experimental data more accurately than a single model. The trained network was then applied to a low-carbon low-silicon steel in order to estimate the appropriate heat treatment process conditions. To explain variations in the mechanical properties, the material was subjected to a typical two-stages intercritical annealing and bainitic holding treatment. According to the results of model, tempering of material for a shorter time results in higher tensile strength and percentage elongation values. This behavior was later confirmed by microstructural studies and was attributed to both higher austenite volume fraction and higher martensite content in the samples tempered for a shorter bainitic holding.Materials Science and Engineering: A.