Surface degradation of nitrided hot work tool steels under repeated impact-sliding contacts: Effect of compound layer


Kaba M., Altay M., Akyildiz E., Muhaffel F., Ozkurt S., Atar E., ...More

Wear, vol.498-499, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 498-499
  • Publication Date: 2022
  • Doi Number: 10.1016/j.wear.2022.204300
  • Journal Name: Wear
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, Index Islamicus, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Nitriding, Compound layer, Hot work tool steel, Wear mechanism, Impact-sliding wear, WEAR BEHAVIOR, SUBSURFACE DEFORMATION, TRIBOLOGICAL BEHAVIOR, IRON D6510, PLASMA, H13, MICROSTRUCTURE, FATIGUE, PERFORMANCE, EXTRUSION
  • Istanbul Technical University Affiliated: Yes

Abstract

© 2022 Elsevier B.V.Wear behaviour of quenched and tempered (QT) hot work tool steels (Uddeholm QRO90) was investigated against SAE 52100 grade bearing steel balls after gas nitriding using a dedicated laboratory scale impact-sliding wear test rig. Gas nitriding was employed in a fluidised bed reactor under two alternative regimes: i. “High Temperature Nitriding (HTN)” carried out at 510 °C and ii. “Low Temperature Nitriding (LTN)” carried out at ≤ 400 °C. The HTN process resulted in the formation of ∼2 μm thick external compound layer, whereas the LTN processed steels were free of any surface compound layer formation. After the impact-sliding wear tests employed at room temperature (RT), the prevailing wear mechanisms of the examined steels were assessed as tribo-oxidation and fatigue wear. The testing at 600 °C induced different wear mechanisms for the HTN and the LTN steels. While tribo-oxidation and fatigue wear were preserved for the HTN steel, plastic deformation dominated the wear that progressed on the compound layer free surface of the LTN steel. Impact-sliding wear testing at 600 °C showed that the wear rate of LTN > HTN steels, as opposed to the wear rate at RT where wear rate of HTN > LTN.