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Effect of niobium on the mechanical properties of powder-metallurgy processed high-speed steels

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Veröffentlicht/Copyright: 2. Februar 2022
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 96 Heft 12

Abstract

Powder-metallurgy processed high-speed steels containing up to 5 wt.% of Nb were fabricated by nitrogen gas atomization of elemental powders followed by hot isostatic pressing and hot working. Microstructural changes, particularly the carbide formation during the heat treatment and the resulting mechanical properties were investigated. After the heat treatment, the primary carbides were identified as MC and M6C-types. With Nb addition, the total volume of primary carbides increased from 16 to 23 vol.% and the volume fraction of MC-type carbide in the primary carbides also increased. The chemistry of the MC-type carbide changed from a V-rich to a V–Nb-rich carbide with increasing Nb content. Hardness significantly increased to a maximum of Rockwell C66 with 1 wt.% Nb and then slightly decreased with further Nb additions. Bend strength, on the other hand, gradually decreased with increasing Nb content. Fracture toughness is almost inversely proportional to the hardness and wear and softening resistance of the Nb alloyed steels are both superior to those of Nb-free steels.

Keywords: Powder metallurgy; Gas atomization; Highspeed steels; Niobium; Carbides; Mechanical properties
Dr. Sungkyu Lee Research Assistant Professor Department of Molecular Science and Technology Ajou University 5 Wonchon, Youngtong, Suwon, 443-749, Korea Tel.: +82 31 2 19 18 49 Fax: +82 31 2 19 16 12

  1. This work was supported by Ministry of Science and Technology, Republic of Korea and in part by Ajou University under Research Facilities Support Program. J.-H. Moon (Department of Mechanical Engineering, Ajou University) assisted in modification and preparation of artwork files.

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Received: 2004-08-04
Accepted: 2005-05-18
Published Online: 2022-02-02

© 2005 Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Frontmatter
  2. Articles Basic
  3. Kinetics of crystallization of amorphous Mg80Cu10Y10
  4. Thermodynamic description of the Al–Fe–Mg–Mn–Si system and investigation of microstructure and microsegregation during directional solidification of an Al–Fe–Mg–Mn–Si alloy
  5. Effect of Ca addition on precipitation in the Pb-4 wt.% Sn alloy
  6. Binary phase diagrams of the rare earth metals with zinc: the Tb–Zn, Ho–Zn and Er–Zn systems
  7. SEM study on the M7C3 carbide nucleation during eutectic solidification of high-chromium white irons
  8. Manifestations of dynamic strain ageing in 2090 Al–Li alloy
  9. Articles Applied
  10. Study on susceptibility of Al–Si alloy castings to surface refinement with TIG arc
  11. Grain refinement of an AZ63B magnesium alloy by an Al–1C master alloy
  12. Retrogression, reaging, and mechanical behaviour of a 1441 Al–Li–Cu–Mg–Zr alloy
  13. The variation of microstructure by α–β forging and its effect on the strength and ductility in Ti–6Al–4V alloy
  14. Interfacial reaction and shear strength of Sn–0.7Cu solder/electrolytic Ni joints with reflow time
  15. Effect of niobium on the mechanical properties of powder-metallurgy processed high-speed steels
  16. High temperature behaviour of H13 steel
  17. Notifications/Mitteilungen
  18. Personal/Personelles
  19. Conferences/Konferenzen
https://doi.org/10.3139/ijmr-2005-0245
Schlagwörter für diesen Artikel
Powder metallurgy; Gas atomization; Highspeed steels; Niobium; Carbides; Mechanical properties

Artikel in diesem Heft

  1. Frontmatter
  2. Articles Basic
  3. Kinetics of crystallization of amorphous Mg80Cu10Y10
  4. Thermodynamic description of the Al–Fe–Mg–Mn–Si system and investigation of microstructure and microsegregation during directional solidification of an Al–Fe–Mg–Mn–Si alloy
  5. Effect of Ca addition on precipitation in the Pb-4 wt.% Sn alloy
  6. Binary phase diagrams of the rare earth metals with zinc: the Tb–Zn, Ho–Zn and Er–Zn systems
  7. SEM study on the M7C3 carbide nucleation during eutectic solidification of high-chromium white irons
  8. Manifestations of dynamic strain ageing in 2090 Al–Li alloy
  9. Articles Applied
  10. Study on susceptibility of Al–Si alloy castings to surface refinement with TIG arc
  11. Grain refinement of an AZ63B magnesium alloy by an Al–1C master alloy
  12. Retrogression, reaging, and mechanical behaviour of a 1441 Al–Li–Cu–Mg–Zr alloy
  13. The variation of microstructure by α–β forging and its effect on the strength and ductility in Ti–6Al–4V alloy
  14. Interfacial reaction and shear strength of Sn–0.7Cu solder/electrolytic Ni joints with reflow time
  15. Effect of niobium on the mechanical properties of powder-metallurgy processed high-speed steels
  16. High temperature behaviour of H13 steel
  17. Notifications/Mitteilungen
  18. Personal/Personelles
  19. Conferences/Konferenzen
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