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Effect of prior austenite grain size on the abrasive wear resistance of ultra-high strength martensitic steels

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Article number203336
JournalWear
Volume454-455
Early online date16 May 2020
DOIs
Publication statusE-pub ahead of print - 16 May 2020
Publication typeA1 Journal article-refereed

Abstract

Prior austenite grain size has a marked effect on the hardenability, strength, and impact toughness properties of steels. This study was conducted in order to understand the effect of prior austenite grain size and morphology on the mechanical properties and abrasive wear performance of an ultra-high strength steel. A commercial quenched 500 HB grade wear-resistant steel was selected for the study: the steel was austenitized at two different temperatures and compared to the original, as-received quenched condition. The resulting mean prior austenite grain size was ranging from 14 μm to 34 μm. The decrease in grain size improved the low-temperature impact toughness properties. A high stress abrasive wear testing method with natural granite abrasives was utilized for the evaluation of abrasive wear resistance. The results suggest that decreasing the prior austenite grain size improves the abrasive wear resistance with similar hardness level martensitic steels. In addition, high-resolution electron backscatter diffraction measurements revealed formation of ultra-fine grain structures in the severely deformed regions of the wear surfaces.

Keywords

  • Abrasion, Electron microscopy, Hardness, Steel, Wear testing

Publication forum classification

Field of science, Statistics Finland