Study of high-temperature plasticity of heat resistant alloys

At the 'Serp i molot' works the technological plasticity has been studied of the nickel based heat resisting alloys EHI 828 (non plastic), EHP99 (of low plasticity), EHP202 (more plastic) and EHI437B (of satisfactory plasticity) by rolling rectangular samples into wedged sections with a simultaneous determination of the fracture toughness. This testing permits to determine the maximum possible compression and plasticity (the initation of the first cracks along the edges). The dependence of the hardness HRA characterizing the strain hardening during rolling on the compression epsilon has been studied. The temperature range for the hot deformation is recommended: the beginning of rolling at 1150 deg C, the end of rolling in the rough mill with compression down to 20% per pass at 1100 to 900 deg C depending on the alloy plasticity and rolling in the final mill at 1050 to 800 deg C