Features of structure and properties of modified multicomponent alloys

Abstract

Study of state of the problem of formation of structure and properties of compact enhance steels and alloys used for cast and deformed pieces of mechanical engineering and aerospace engineering. To solve this problem is provided a method of modifying metal melts dispersed nanosized refractory formulations range.The material of the study were multi-component (heat-resistant) nickel alloys for blades aviation gas turbine engines (GTE) and Si- Mn steels used for gas and oil pipes and welded structures responsible. The chemical composition of heat resisting nickel alloys,% wt .: Al-4,0%; Ti-2,5; Cr-11.0; Mo-3,8; W-3,8; Co-8,0; C-0,09; Fe-2,0; Ni- base. The chemical composition of 15GS and 16GS,% wt .: C-0.16 Si- Mn steels; Si-0,70; Mn-1,20; Cr <0,3; Ni <0,3; Cu <0, 3; S <0,040; P <0,035.Reasonable selection guidelines Nanodisperse complex modifiers in relation to the composition of alloys. Compositions designed nanomodifiers heat resisting nickel alloys, titanium based carbonitride powders of Ti (C, N); kremniymargantsovistyh for steel - based on titanium and aluminum. The formulations are patented modifiers.The laboratory and pilot-scale melting of the alloys with varying number of members of modifiers.An experimental set optimal amount of injected modifier 0,10..0,20% of the mass of the melt.The initial size of 60..100 nm nanopowders obtained by plasma-chemical synthesis. The study granulometry powder specific surface modifier particles picked Ti (C, N) and Ti; crystallographic parameters. Modifiers administered in tablet form in the melt. Installed temperature and time parameters modification. Duration complex modifiers make up for nickel alloys up to 5 minutes for the steel -15 min. In industrial conditions experienced cast castings for turbine engine blades and blanks for further deformation. The samples - witnesses investigated the structure, mechanical and corrosion properties of alloys in the original and modified state.As a result, a substantial modification achieved grain refinement Ni-alloys from 5..8mm to 0,5..1mm. and stalyah- Si- Mn 1.5. The phase composition of the alloy by X-ray electron microprobe analysis. The formation of dispersed carbide phases in the Ni-alloys, both inside and along the grain boundaries, as well as strengthening of intermetallic compounds dispersed Ni3Ti.Achieved increase of properties for Ni-alloys: σв 7%, δ-24%, KCU-46%; for Si- Mn steels: σв - 23%, δ-18%, KCU-40%