Study On Heat Treatment And Hot Deformation Behaviors Of The Spray Formed Fgh4095Alloy

Nickel based powder superalloy FGH4095is one of preferred materials of aviation turbine engines, for improveing performance and cost saving, it is hot that powder superalloy prepared with spray formed technology and whose microstructure evolution during preparing process. Heat treatment and hot deformation behavior of spray formed FGH4095pow-der superalloy was studied in this thesis. Heat treatment process of specimen was vacuum heat treatment, the hot compression deformation behavior of spray formed FGH4095was studied by thermal simulator experiment on Gleeble-1500. microstructure of spray formed FGH4095of heat treatment deformation was studied with OM, SEM, Image-Pro Plus professional image analyand hot sis software, establishing model and processing map based on data of spray formed FGH4095with hot compression. The main results are as follows:1、The microstructure of spray formed FGH4095are matrix phase y and strengthening phase γ’, The volume fraction of γ’phase is about50%, and there are a few carbides, γ’ phase and carbides distribution on the grain boundaries and inside grains, the morphology of γ’phase and carbides are flower particles and blocks respectively,the size of over-spray formed power is matching well with grain size.2、For spray formed FGH4095,the oxygen content and nitrogen content is20ppm and200ppm respectively, the average density is about98%.3、The dissolve quantity of primary γ’and the size of precipitation γ’were rise with the increasing solution temperature (1120℃～1160℃), there are few primary γ’in the matrix with solution temperature1160℃. During aging treatment, there are few new y’precipitati-ng, about20nm～86nm size.4、The analysis stress-strain curve of hot deformation show that there are four phases, as work-hardening, dynamic recovery, dynamic recrystallization and stable strain stage.the main flow stress influence factors are deformation temperature and strain rate, with deformation temperature ascending and strain rate descending, the flow stress descending. There are primary area, serious deformation area, hard deformation area, and light deformation area for a hot compression specimen. Serious deformation area show that recovery occur at low deformation temperature and low strain rate, recrystallization grain was formed at1140℃, most of area formed recrystallization grain at1140℃、10s-1.5、According to linear regression method calculated hot compression peak stress of spray formed FGH4095constitutive equation, by verification, the model is useful, it can provide theoretical basis for hot process of spray formed FGH4095.6、Based on DMM and experiment data established processing map of spray formed FGH4095, and show that the best processing area is above1100℃and0.02s-1.