DEVELOPMENT OF A HIGH TOUGHNESS BAINITE IN A 38MnV7 STEEL

Previous works have shown that high toughness can be obtained in medium carbon bainitic steel (38MnV7) after a careful control of the chemistry and heat thermal treatment. Charpy-V tests at room temperature provided 40J for the steel after an isothermal bainitic treatment. Further improvement in toughness was obtained by subsequent tempering reaching an absorbed energy value of 50J with a FATT of -40oC. Present work is oriented to an optimization of the above chemical composition.