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Study on Microstructure and Properties of Bainitic Steel for Switch-point Component

Huizhen Wang

Abstract

The microstructure and mechanical properties of a new kind of low alloy bainitic steel were studied after normalizing and low temperature tempering.The results show that the microstructure of bainitic steel after normalizing is a new kind of bainite which consists of bainite ferrite and retained austenite,and the mechanical properties of the bainitic steel is better than that of current premium rail steels: σb 1240~1346 MPa,αku 68~100 J/cm2, δ5 15%~20% and hardness 41.5~45 HRC.This bainitic steel has good tensile toughness,hardness and toughness,so they are applicable to make frog and rail.

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Key concepts: Bainite, Microstructure, Tempering, Materials science, Austenite, Metallurgy, Toughness, Ferrite (magnet)