Distortion and residual stress measurements of induction hardened AISI 4340 discs

  1. Get@NRC: Distortion and residual stress measurements of induction hardened AISI 4340 discs (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.matchemphys.2013.07.012
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Journal titleMaterials Chemistry and Physics
Pages248258; # of pages: 11
SubjectHardened layers; Hardening depth; Hardness levels; Induction hardening; Lattice spacing; Neutron scattering and diffraction; Orthogonal directions; Stress calculations; Hardness; Heat treatment; Induction heating; Metals; Neutron diffraction; Residual stresses; Stress concentration; X ray diffraction; Hardening
Abstract10 Induction hardened discs with two initial hardness levels were used for exploring the influences of the variation of initial hardness as well as induction hardening (IH) recipes on the heat treatment distortions and hardening depth. The results show that for the same initial hardness, the larger the energy input, the higher the distortion size as well as the hardening depth. For a given induction hardening recipe, the increase in initial hardness leads to a deeper hardening depth but a smaller distortion. One disc was selected for the residual stress investigation in three orthogonal directions by neutron diffraction (ND). The corresponding stress-free lattice spacing d0 was measured from the same material using both ND and X-ray diffraction (XRD) methods. The ND results show that the variation of d0 in the hardened layer is significant and should be taken into account for stress calculation. However, regarding the core region, the d0 value measured by XRD is more reliable. Accordingly, a combination of the ND-measured d0 profiles in the hardened layer and the XRD-measured d0 value in the core was adopted for the determination of residual stress distributions. © 2013 Elsevier B.V. All rights reserved.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Canadian Neutron Beam Centre (CNBC-CCFN)
Peer reviewedYes
NPARC number21269973
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Record identifiere45080cc-3d18-4adc-833f-4e0f9a1502b1
Record created2013-12-13
Record modified2016-05-09
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