Mechanical properties of nickel steels with isothermal and athermal martensite

Abstract

1. From the temperature dependence of Ms of isothermal and athermal components of the martensitic transformation in relation to the carbon and nickel concentrations a relationship was established between the isothermal martensitic and isothermal bainitic transformations respectively in Fe−Ni alloys and nickel steels and also between the athermal and isothermal martensitic transformations. 2. Steels with 10% Ni treated to isothermal temper martensite and isothermal bainitic temper martensite have a higher impact strength at 20 and −196° than steels with the same strength treated to athermal temper martensite.