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Supersolidus Sintering Of Cr Prealloyed Steels By Conventional And Inductive Heating

  • : Marie-Christine Huemer1, Christian Gierl-Mayer1, Herbert Danninger1, Magdalena Dlapka2, Gerold Stetina2, Raimund Ratzi2
  • : 1Vienna University of Technology, 2MIBA Sinter Austria
  • : PDF Download
  • : 2016

Abstract

Supersolidus sintering is an effective means to attain high sintered density, as known from PM high speed steels. In the present work it is shown that it can also be applied to Cr prealloyed low alloy steel grades. Indirect supersolidus sintering requires precise temperature and atmosphere (= carbon) control, higher C contents being beneficial here since they enable lower temperatures and cause wider temperature windows for sintering. Since the temperatures necessary at moderate C levels are fairly high for standard sintering furnaces, inductive final sintering of presintered specimens was studied in parallel. It showed that also here precise temperature control is required, but for any carbon level tested a sintering temperature could be identified that yielded high sintered density and good shape retention. The high density attained, in combination with the very high temperatures, results in pronounced grain growth which can however be remedied by suitable heat treatment.

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