Mechanical properties of high alloyed cast and rolled CrMnNi TRIP steels with varying Ni contents

Abstract

High alloyed metastable austenitic or austenitic-martensitic steels show a strain induced formation of martensite during mechanical loading. These kinds of steels are well known as material for rolled products. Based on the System Fe-Cr-Mn-Ni a new generation of cast steels with TRIP effect will be discussed. The investigations show how the mechanical properties and the fraction of the formed martensite are influenced by varying Ni contents. The mechanical properties in the cast state of the material are quite similar to those in the rolled state. This is valid for tensile as well as compression loading. Under certain conditions, an isothermal formation of martensite was observed in some of the steels. The experimental results are based on tensile and compression tests. The specimens were analysed by optical microscopy, electron backscatter diffraction (EBSD), dilatometer tests and a special method for the detection of the ferromagnetic phase contents, the magnetic balance.