Development of Bainitic Steel with High-Strength and -Resistance to Shock

Abstract

  Intragranular bainite (α), which consists of 24 variants formed at random, in steels has been investigated in order to develop both strength and toughness. The orientation relationship, {011}α//{111}γ, <111>α//<101>γ and <211>α//<121>γ, between intragranular bainite and austenite (γ) has been analyzed to be an important controlling factor for toughness. It could be suggested that the increase in the number density of nucleation site for lath of intragranular bainite increases in both strength and toughness of bainitic steels.