Uticaj Broja Nodula Na Mikrostrukturu I Mehaničke Osobine Kod Hipoeutektičnog Austemperovanog Nodularnog Liva Legiranog Niklom

Translated title of the contribution: Nodule Count Effect On Microstructure And Mechanical Properties Of Hypo-Eutectic Adi Alloyed With Nickel

Research output: Contribution to journalArticlepeer-review

Abstract

Samples of ductile iron alloyed with 0.88 % Ni with a nodule count of 606, 523, and 290 nod/mm2 were obtained from sand cast plates of different thickness in the range from 8.46 to 25.4 mm. The effect of the nodule count was evaluated during the austempering process held at 285 °C and austempering times of 15, 30, 45, 60, 70, and 90 min. The volume fraction of high carbon austenite increased when the nodule count increased, however, the carbon content of the high carbon austenite kept almost constant. The process window was narrow, requiring a lower austempering time when the nodule count increased. The combination of a higher nodule count and low austempering temperature allowed obtaining a fine ausferritic microstructure which led to higher Brinell hardness and tensile strength. The process window was determined by XRD measurements and it was in good agreement with the microstructural and hardness evolution as the austempering time increased.

Translated title of the contributionNodule Count Effect On Microstructure And Mechanical Properties Of Hypo-Eutectic Adi Alloyed With Nickel
Original languageNorwegian
Pages (from-to)115-124
Number of pages10
JournalJournal of Mining and Metallurgy, Section B: Metallurgy
Volume57
Issue number1
DOIs
StatePublished - 2021

Keywords

  • ADI
  • Ductile iron
  • Nickel
  • Nodule count
  • Process window

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