The effects of reduction in area due to rotary forging on the structure, physical and mechanical properties of 92,5W-5Ni-2,5Fe heavy alloy rods have been presented in this paper. Sintered rods (20mm) were rotary forged with reduction ranging from 5 to 30. Tensile and toughness testing showed that intensive strengthening and rather moderate toughness lowering followed the reduction increase. After 30 deformation, the yield and tensile strength were increased from 729 to 1393 MPa (cca 90), and from 771 to 1400 MPa (cca 80) respectively. Toughness was reduced from 39 to 21 J. Hardening of the γ-interlayer (γ-phase) and spherical tungsten particle (W-phase) was monitored by microhardness measurements and changes in structure were analyzed as a function of achieved reductions. Fracture analysis has shown that, both in sintered and forged conditions, intercrystalline fracture prevails in the tungsten phase while transcrystalline fracture is rather typical for the γ-phase. Macro and microhrad...ness variations with deformation were also modeled. .
U radu su prikazani rezultati ispitivanja uticaja stepena hladne deformacije rotacionim kovanjem na strukturu, fizička i mehanička svojstva legura teških metala, nominalnog sastava 92,5W-5Ni-2,5Fe. Sinterovane šipke prečnika 20 mm rotaciono su kovane do stepena deformacije od 5 do 30. Ispitivanja zateznih svojstava i žilavosti pokazala su da sa porastom stepena deformacije čvrstoća intenzivno raste, a žilavost se smanjuje. Nakon deformacije od 30 granica razvlačenja i zatezna čvrstoća povećavaju se od 729 do 1393 MPa (cca 90) i od 771 do 1400 MPa (cca 80), respektivno. Žilavost legure menja se u znatno užem intervalu (39-21 J). Merenjem tvrdoće šipki po poprečnom preseku ustanovljena je izražena nehomogenost raspodele tvrdoće, kao posledica nehomogene deformacije. na osnovu merenja tvrdoće strukturnih mikrokonstituenata (W i γ-faza) praćen je intenzitet ojačavanja faza, i izvršena je analiza strukturnih promena u funkciji stepena deformacije. Analiza površine loma pokazala je da, kako ...u sinterovanom tako i u kovanom stanju, interkristalni lom preovladava kod volframove faze, a transkristalni kod γ-faze. Takođe, izvršeno je modelovanje promena makro- i mikrotvrdoće u zavisnosti od stepena hladne plastične deformacije. .
Keywords:
heavy metal / rotary forging / tungsten-phase / γ-phase / fracture / teški metal / rotaciono kovanje / ojačavanje / prelom
Source:
Science of Sintering, 2001, 33, 1, 47-56
Publisher:
International Institute for the Science of Sintering, Beograd
TY - JOUR
AU - Katavić, B.
AU - Nikačević, M.
AU - Živojinović, B.
AU - Romhanji, Endre
AU - Aleksić, Radoslav
PY - 2001
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/393
AB - The effects of reduction in area due to rotary forging on the structure, physical and mechanical properties of 92,5W-5Ni-2,5Fe heavy alloy rods have been presented in this paper. Sintered rods (20mm) were rotary forged with reduction ranging from 5 to 30. Tensile and toughness testing showed that intensive strengthening and rather moderate toughness lowering followed the reduction increase. After 30 deformation, the yield and tensile strength were increased from 729 to 1393 MPa (cca 90), and from 771 to 1400 MPa (cca 80) respectively. Toughness was reduced from 39 to 21 J. Hardening of the γ-interlayer (γ-phase) and spherical tungsten particle (W-phase) was monitored by microhardness measurements and changes in structure were analyzed as a function of achieved reductions. Fracture analysis has shown that, both in sintered and forged conditions, intercrystalline fracture prevails in the tungsten phase while transcrystalline fracture is rather typical for the γ-phase. Macro and microhradness variations with deformation were also modeled. .
AB - U radu su prikazani rezultati ispitivanja uticaja stepena hladne deformacije rotacionim kovanjem na strukturu, fizička i mehanička svojstva legura teških metala, nominalnog sastava 92,5W-5Ni-2,5Fe. Sinterovane šipke prečnika 20 mm rotaciono su kovane do stepena deformacije od 5 do 30. Ispitivanja zateznih svojstava i žilavosti pokazala su da sa porastom stepena deformacije čvrstoća intenzivno raste, a žilavost se smanjuje. Nakon deformacije od 30 granica razvlačenja i zatezna čvrstoća povećavaju se od 729 do 1393 MPa (cca 90) i od 771 do 1400 MPa (cca 80), respektivno. Žilavost legure menja se u znatno užem intervalu (39-21 J). Merenjem tvrdoće šipki po poprečnom preseku ustanovljena je izražena nehomogenost raspodele tvrdoće, kao posledica nehomogene deformacije. na osnovu merenja tvrdoće strukturnih mikrokonstituenata (W i γ-faza) praćen je intenzitet ojačavanja faza, i izvršena je analiza strukturnih promena u funkciji stepena deformacije. Analiza površine loma pokazala je da, kako u sinterovanom tako i u kovanom stanju, interkristalni lom preovladava kod volframove faze, a transkristalni kod γ-faze. Takođe, izvršeno je modelovanje promena makro- i mikrotvrdoće u zavisnosti od stepena hladne plastične deformacije. .
PB - International Institute for the Science of Sintering, Beograd
T2 - Science of Sintering
T1 - Effects of plastic deformation on the properties of W-Ni-Fe heavy alloys
EP - 56
IS - 1
SP - 47
VL - 33
UR - conv_252
ER -
@article{
author = "Katavić, B. and Nikačević, M. and Živojinović, B. and Romhanji, Endre and Aleksić, Radoslav",
year = "2001",
abstract = "The effects of reduction in area due to rotary forging on the structure, physical and mechanical properties of 92,5W-5Ni-2,5Fe heavy alloy rods have been presented in this paper. Sintered rods (20mm) were rotary forged with reduction ranging from 5 to 30. Tensile and toughness testing showed that intensive strengthening and rather moderate toughness lowering followed the reduction increase. After 30 deformation, the yield and tensile strength were increased from 729 to 1393 MPa (cca 90), and from 771 to 1400 MPa (cca 80) respectively. Toughness was reduced from 39 to 21 J. Hardening of the γ-interlayer (γ-phase) and spherical tungsten particle (W-phase) was monitored by microhardness measurements and changes in structure were analyzed as a function of achieved reductions. Fracture analysis has shown that, both in sintered and forged conditions, intercrystalline fracture prevails in the tungsten phase while transcrystalline fracture is rather typical for the γ-phase. Macro and microhradness variations with deformation were also modeled. ., U radu su prikazani rezultati ispitivanja uticaja stepena hladne deformacije rotacionim kovanjem na strukturu, fizička i mehanička svojstva legura teških metala, nominalnog sastava 92,5W-5Ni-2,5Fe. Sinterovane šipke prečnika 20 mm rotaciono su kovane do stepena deformacije od 5 do 30. Ispitivanja zateznih svojstava i žilavosti pokazala su da sa porastom stepena deformacije čvrstoća intenzivno raste, a žilavost se smanjuje. Nakon deformacije od 30 granica razvlačenja i zatezna čvrstoća povećavaju se od 729 do 1393 MPa (cca 90) i od 771 do 1400 MPa (cca 80), respektivno. Žilavost legure menja se u znatno užem intervalu (39-21 J). Merenjem tvrdoće šipki po poprečnom preseku ustanovljena je izražena nehomogenost raspodele tvrdoće, kao posledica nehomogene deformacije. na osnovu merenja tvrdoće strukturnih mikrokonstituenata (W i γ-faza) praćen je intenzitet ojačavanja faza, i izvršena je analiza strukturnih promena u funkciji stepena deformacije. Analiza površine loma pokazala je da, kako u sinterovanom tako i u kovanom stanju, interkristalni lom preovladava kod volframove faze, a transkristalni kod γ-faze. Takođe, izvršeno je modelovanje promena makro- i mikrotvrdoće u zavisnosti od stepena hladne plastične deformacije. .",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "Effects of plastic deformation on the properties of W-Ni-Fe heavy alloys",
pages = "56-47",
number = "1",
volume = "33",
url = "conv_252"
}
Katavić, B., Nikačević, M., Živojinović, B., Romhanji, E.,& Aleksić, R.. (2001). Effects of plastic deformation on the properties of W-Ni-Fe heavy alloys. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 33(1), 47-56.
conv_252
Katavić B, Nikačević M, Živojinović B, Romhanji E, Aleksić R. Effects of plastic deformation on the properties of W-Ni-Fe heavy alloys. in Science of Sintering. 2001;33(1):47-56.
conv_252 .
Katavić, B., Nikačević, M., Živojinović, B., Romhanji, Endre, Aleksić, Radoslav, "Effects of plastic deformation on the properties of W-Ni-Fe heavy alloys" in Science of Sintering, 33, no. 1 (2001):47-56,
conv_252 .
