The Effect of Forging and Heat Treatment Variables on Microstructure and Mechanical Properties of a Re-Bearing Powder-Metallurgy Nickel Base Superalloy

被引:2
|
作者
Mukhtarov, Shamil [1 ]
Karyagin, Dmitry [2 ]
Ganeev, Artem [1 ]
Zainullin, Rishat [1 ]
Shakhov, Ruslan [1 ]
Imayev, Valery [1 ]
机构
[1] Russian Acad Sci, Inst Met Superplast Problems, Ufa 450001, Russia
[2] CMK, Stupino 142800, Russia
关键词
nickel base superalloy; powder metallurgy; microstructure; forging; heat treatment; tensile properties; creep properties; DISK; NI;
D O I
10.3390/met13061110
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In our previous works, the effects of forging and heat treatment variables on microstructure evolution and mechanical properties have been studied for an ingot-metallurgy Re-bearing nickel base superalloy. To overcome the issues associated with the production of large-scale ingots and fine-grained workpieces, in the present work, the effect of hot forging and heat treatment variables was studied in a Re-bearing nickel base superalloy prepared via powder metallurgy. The purpose of the study was to reach the properly balanced mechanical properties for the potential use of the superalloy as a disc material. The initial as-HIPed workpieces were subjected to different hot forging and post-forging heat treatment or only to heat treatment (no forging). For the processed workpieces, the recrystallization behavior, size, morphology and volume fraction of & gamma;& PRIME; precipitates were evaluated by scanning electron microscopy followed by a study of mechanical properties. The most properly balanced mechanical properties (strength, ductility, creep resistance and creep rupture lifetime) were reached for the & gamma; grain size of d(& gamma;) & AP; 13.6 & mu;m. A finer and coarser & gamma; grain size (down to d(& gamma;) & AP; 2.6 and up to d(& gamma;) & AP; 37.5 & mu;m) even when superimposed with a higher volume fraction of dispersed secondary & gamma;& PRIME; precipitates (in the case of d(& gamma;) = 27-37.5 & mu;m) was associated with worse mechanical properties.
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页数:19
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