Paper Title:
Mechanical Properties in Ultrahigh Strength Secondary Hardening Steels Bearing Co and Ni
  Abstract

Applying the severe deformation, the mechanical properties related to secondary hardening were investigated. The Mo-Cr-Co-Ni steels containing (5-13)wt% Co and (8-14)wt% Ni were severely rolled at 850 °C, followed by direct quenching(DQ). DQ specimens were then isothermally aged at 475°C. Ni additions promoted aging kinetics, accompanied by a little enhancement in hardness. In contrast, Co additions enhanced the peak hardness, but did not induce a remarkable aging acceleration. In the 13Co addition group, an actual secondary hardening, that is, the peak hardness is higher than the as-quenched hardness. Variation in peak hardness(Rc) in alloys is summarized as follows; 14Ni-13Co(57.2) ≒ 11Ni-13Co(57.1) > 8Ni-13Co(56.5) > 11Ni- 9Co(56.2) > 8Ni-9Co(54.4) > 11Ni-5Co(53.4).

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
4417-4421
DOI
10.4028/www.scientific.net/MSF.539-543.4417
Citation
H. S. Sim, K. S. Cho, K. B. Lee, H. R. Yang, H. Kwon, "Mechanical Properties in Ultrahigh Strength Secondary Hardening Steels Bearing Co and Ni", Materials Science Forum, Vols. 539-543, pp. 4417-4421, 2007
Online since
March 2007
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