The paper is focused on investigation of the deformation behaviour of two nickel alloys - IN 713 LC and MAR M-247, delivered in the as-cast state. The aim was to determine physically the nil-strength temperatures and on the basis of tests by uniaxial tension to create 3D maps of plastic and strength characteristics of both these alloys. The determined nil-strength temperatures of the examined materials make 1295 °C for the alloy IN 713 LC and 1310 °C for the alloy MAR M-247. These values are almost by 100 °C lower than those of conventional steels, which indicates an increased susceptibility of these alloys to burning at heating prior to forming. Results of high temperature tensile tests of those alloys correspond to the low nil-strength temperatures. The investigated alloys could be processed by forming in a relatively narrow temperature range of approx. 1000 - 1100 °C (IN 713 LC), or approx. 1000 - 1200 °C (MAR M-247). The experiments were performed on a hot deformation simulator HDS-20, which is operated at the Regional Materials Science and Technology Centre at the VŠB - Technical University of Ostrava (VŠB-TU Ostrava).Keywords: nil-strength temperature, tension test, HDS-20, nickel alloy
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