Some Characteristics of the Behavior of Heat-Resistant Alloys Under Cyclically Changing Temperatures (Nekotorye Osobennosti Povedeniya Zharopochnykh Splavov pri Tsiklicheski Menyayushchikhsya Temperatupakh),
Abstract
Billets (15 mm in diameter and 160 mm in length) in a thermally processed state were subjected to heatings under cyclically changing temperatures (700-850C) in 3 regimes. It was found that with cyclically changing temperatures, when processes of softening and hardening alternate in the alloy EI437B, long-term endurance (strength) can be reduced by several times. The degree of this decrease is dependent on cycle duration. An alloy with molybdenum is also softened in several cycles. There is a gradual decrease in long-term strength with an increase in the number of cycles. An increase in holding at the upper temperature of the cycle intensifies softening. An increase of softening at the lower cycle temperature first intensifies softening of the alloy, but this then increases. A decrease in the heat resistance of an alloy is caused by: (a) an impoverishment of the basic solid solution with titanium and aluminum, being extended on the formation of additional quantities of the gamma-phase; (b) a fragmentation of the basic grains and the formation of secondary segregations on their boundaries which weaken intergranular cohesion. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 04, 1970
- Accession Number
- AD0727357
Entities
People
- S. A. Goryunov
- V. D. Mortikov
- V. I. Prosvirin
Organizations
- United States Army Foreign Science and Technology Center