Effects of Fine Particle Peening on Fatigue Strength of Transformation-Induced Plasticity (TRIP)-Aided Martensitic Steel

Abstract:

The effects of fine particle peening on the torsional strength of a transformation-inducedplasticity (TRIP)-aided martensitic (TM) steel were investigated for applications to precision gears. Fine particle peening increased the fatigue limits and lowered the notch-sensitivities of steel, compared with quenched and subsequently tempered SNCM420 steel. In addition, fine particle peening lowered the fatigue crack propagation rate in TM steel with a high threshold value of the stress intensity range. These results were associated with (1) higher Vickers hardness, (2) higher compressive residual stress, and (3) a larger amount of untransformed retained austenite in the surface layer when compared with SNCM420 steel.

• Periodical: Key Engineering Materials (Volume 665)
• Pages: 85-88
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.665.85
• Online since: September 2015
• Authors: Koh Ichi Sugimoto*, Yuta Mizuno, Tomohiko Hojo
• Keywords: Fine Particle Peening, Residual Stress, Retained Austenite, Strain-Induced Transformation, Torsional Fatigue Strength, Transformation-Induced Plasticity (TRIP)-aided Martensitic Steel

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