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Analysis of Bainite Onset During Cooling Following Prior Deformation at Different Temperatures

2017; AGH University of Science and Technology; Volume: 17; Issue: 1 Linguagem: Inglês

10.7494/cmms.2017.1.0572

1641-8581

Aarne Pohjonen, Antti Kaijalainen, Mahesh C. Somani, Jari Larkiola,

Metallurgy and Material Forming

We apply method for calculating the austenite to bainite phase transformation onset for any cooling path for a steel of composition 0.09C, 0.2Si, 1.0Mn, 0.03Al, 1.1Cr, 0.18Mo, 0.026Ti, 0.0018B (wt. %) following deformation at different temperatures. The method is parameterized by constant cooling rate experiments to obtain the CCT diagram of this steel following deformation either above recrystallization limit temperature (RLT) or below the no-recrystallization temperature (Tnr). Using the CCT diagrams, we have performed analytical/numerical analysis of the transformation onset, which is based on the conversion of CCT to ideal TTT transformation diagram by the inversion of Scheil’s additivity rule. After the conversion, the transformation onset can be calculated for any cooling path by applying Scheil’s additivity rule. The analysis also provides information on the thermal activation parameters of the transformation onset. The discussion of the results is also provided.