Influence of Temperature-Velocity Deformation Parameters on Structures of the Heat-Resistant Nickel Alloy

Author details

Abstract

The paper aims at predicting structures of granular heat-resistant nickel alloys after hot deformation, which is significantly influenced by temperature-velocity deformation conditions. The developed method predicts the material's structure based on stresses and temperatures arising in it during isothermal stamping. To form a required structure in granulated heat-resistant nickel alloys (HRNA), it is rational to use the conditions of close-to-isothermal or isothermal deformation. The temperature-velocity deformation conditions, which are chosen taking into account the chemical composition of the alloy and the required degree of deformation, have a significant effect on grain sizes. To assess the material structure, a relation was determined. This dependence can be obtained by experimental studies of the samples from the HRNA material, by conducting a sludge test with various degrees of deformation and by measuring the size of the γ phase after the test. To determine the degree of influence of the deformation rate and deformation temperature on the change in the structure, microstructure studies of samples were carried out after sludge testing of HRNA with the determination of the size of the γ' phase. The microstructure was studied with a magnification of 10,000 times. We analyzed the results of studying deformability and microstructure of the HRNA alloy. According to these results, it was found that with an increase in the deformation temperature, the γ' phase both inside and at the grain boundary at all deformation rates was greater. It should be noted that low deformation rates at temperatures above 1100 ° C lead to a significant increase in the size of the γ' phase. Also there is a slight influence of the deformation temperature starting from 1100 ° C at velocities above 0.017 s-1.

Keywords

heat-resistant nickel alloysgranular alloysfunctional gradient structureisothermal stampingmathematical modeling.

Bibliography

  1. 1.A.A. Inozemtsev, V.L. Sandarsky. Gas turbine engines. Part 1 - Perm//Ed. Aviadvigatel OJSC. - 2006. - p. 599. Scholar
  2. 2.Gabb T. P. et al. Fatigue resistance of the grain size transition zone in a dual microstructure superalloy disk // International Journal of Fatigue. - 2011. - T. 33. - №. 3. - pp. 414-426. Scholar
  3. 3.Kablov E.N., Lomberg B.S., Ospennikova O.G. Creation of modern heat-resistant materials and technologies for their production for aircraft engine building // Wings of the Motherland. 2012. No. 3-4. P. 34. Scholar
  4. 4.Smirnov O.M. et al. The influence of combined loading on the parameters of stamping flat disks in a state of superplasticity // Processing of materials by pressure. 1997. No. 1. P. 1. Scholar
  5. 5.Afonin V.L. et al. Research and development of innovative technological processes and intelligent control systems for the manufacture of gas turbine engine (GTE) parts. M.: IMASH, 2019. p 137. Scholar
  6. 6.Kuksa L.V., Rudnitsky E.N., Fatkullin O.K. Studies of alloy deformation micromechanism EP741P at different test temperatures//Granule metallurgy. Sat. articles, no. 5. VILS, - 1989 - pp. 265-271. Scholar
  7. 7.D.A. Egorov, G.S. Garibov, N.M. Grits, A.M. Kazberovich, N.A. Ryzhov. Study of the material of blanks of disks with a variable structure from pellets of heat-resistant nickel alloys manufactured using direct HIP technology//Light alloy technology. - 2014. - №3. Scholar
  8. 8.D.D. Vaulin, O.N. Vlasova, L.D. Ber, E.B. Kachanov, O.G. Ukolova. Investigation of structure formation mechanism at hot deformation and heat treatment of turbine disk blanks from granulated alloy EP741NP//Technology of light alloys. - 2009. - №4. Scholar
  9. 9.Joe Lemsky. Assessment of NASA Dual Microstructure Heat Treatment Method Utilizing Ladish Super CoolerTM Cooling Technology // NASA/CR - 2005-213574. Scholar
  10. 10.John Gayda. Dual Microstructure Heat Treatment of a Nickel-Base Disk Alloy // NASA/TM - 2001-211168. Scholar
Download PDF

Article information

Published
25 November 2024
Issue date
25 November 2024
Issue
No. 4 (2024)
Share