On Ausferrite Produced in Thin Sections: Stability Assessment through Round and Flat Tensile Specimen Testing

Ductile irons were produced into different casting wall sections, that is, 25 mm, 5 mm and 3 mm. The alloys then austenitized with the same conditions at 875 °C for 2 h austempered three combinations of temperatures times: 250 6 h, 310 380 1 h. aim investigation was to study ausferrite stability ductile nominal contents nickel in thin sections through tensile testing. So, strain hardening analysis flow curves carried out since it has been found be a reliable support ductility assessing optimal austempering conditions. Because round flat specimens geometries complying ASTM E8/E8M-11 tested. Austempered from tested geometry only, while both geometries. Though affected by Ni content graphite morphology improved reduced mechanical behavior insensitive section thickness below Furthermore, resulted plastic sensitive specimen consistent way, increasing instability indicating proper comparison properties must take account geometry.