The effect of cooling speed by technological thermal cycling on the long-term strength of cast heat-resistant alloy 45Cr26Ni33Si2Nb2

Experimentally determined was a long-term strength of cast superalloy 45Cr26Ni33Si2Nb2 at 1150 °C after preliminary curing at 1150°C during 2 to 100 hours, followed by cooling in water. It was found that rapid cooling from the operating temperature to room temperature during the initial period of operation contributes to long-term strength of Fe-Cr-Ni-based alloys compared to cast state and largely prevents reduction of performance characteristics of superalloys based on the system Fe-Cr-Ni during operation.