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By using of hot tensile tests, which were realized on the simulator HDS-20, the strength and plastic properties of two progressive alloys, based on Fe-Ni-Cr (Incoloy 800HT) and Fe-Ni (Invar 36), were experimentally determined. By a special type of a tensile test, involving a continuous control heating of the tested specimens at their simultaneous load by a constant tensile force of 80 N, a nil-strength temperature of both investigated alloys was determined. In comparison to the Invar 36 alloy, the Incoloy 800HT alloy showed a 71 °C lower nil-strength temperature. By continuous uniaxial tensile tests to rupture, which were performed in a range of deformation temperatures of 800 – 1,390 °C at a constant tensile rate of 1 mm·s-1, the strength and plastic properties of both investigated alloys were examined. In comparison to the Invar 36 alloy, the Incoloy 800HT alloy showed in the whole range of deformation temperatures a higher strength. A nil-ductility temperature of the Incoloy 800HT and Invar 36 alloys was 1310 °C and 1390 °C, respectively. A difference between the nil-strength temperature and the nil-ductility temperature was in the case of the Incoloy 800HT and Invar 36 alloy established as 38 °C and 29 °C, respectively.
Keywords: Incoloy 800HT, Invar 36, nil-strength temperature, nil-ductility temperature© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.