Assessment of mechanical property gradients after impact-based surface treatment: application to pure α-iron

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• 作者：David Tumbajoy-Spinel^a ; ; Sylvie Descartes^b ; Jean-Michel Bergheau^c ; Victor Lacaille^a ; ^c ; ^d ; Gaylord Guillonneau^e ; ^f ; Johann Michler^e ; Guillaume Kermouche^a
• 关键词：Nano-indentation ; In situ micro-pillar compression ; Mechanical property gradient ; Mechanical surface treatment ; Tribologically Transformed Surface (TTS) ; Iron
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：14 June 2016
• 年：2016
• 卷：667
• 期：Complete
• 页码：189-198
• 全文大小：4686 K

文摘

Mechanical surface treatments are known for their ability to improve material resistance to abrasive wear and local fatigue crack microstructure of the home-made crack propagation. These treatments are based on repeated contact loadings which create large plastic strains in the near-surface that can induce a local grain refinement. In this case, a significant increase in the near-surface local mechanical properties is thus usually observed. In this paper, nano-mechanical tests are used to quantify the mechanical property gradient in the near-surface of a purity-controlled α-iron after an impact-based treatment. A methodology based on the combination of two different techniques is proposed: nano-indentation and in-situ micro-pillar compression. The resulting in-depth mechanical properties gradient is compared to the average grain size measured by EBSD. A positive relationship with the well-known Hall-Petch effect is observed.