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Evolution of Microstructure from the Surface to the Interior of Cr-Mo Steel by Water Jet Peening
Tokyo University of Science, Yamaguchi, Japan
Tokyo University of Science, Yamaguchi, Japan
Tokyo University of Science, Yamaguchi, Japan
Tokyo University of Science, Yamaguchi, Japan
- 1 Tokyo University of Science, Yamaguchi, Japan
- 2 Tokyo University of Science, Yamaguchi, Japan
- 3 Tokyo University of Science, Yamaguchi, Japan
- 4 Tokyo University of Science, Yamaguchi, Japan
Materials Sciences and Applications·Volume 08 (2017)·Pages 708–715·Published 5 September 2017·DOI10.4236/msa.2017.810050
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Abstract
The microstructure and hardness on and below the surface of Cr-Mo steel (SCM435) treated by water jet peening (WJP) were investigated using scanning electron microscopy and micro Vickers hardness measurements. The change of the surface residual stress caused by the WJP treatment influenced the surface microstructure and surface hardness of the SCM435 steel. Cementite in the pearlite phase tended to protrude as the duration of WJP was increased. Voids were formed in the area 0.5 - 1.0 mm below the surface and also at grain boundaries between ferrite and pearlite grains, whereas no voids were formed in the depth range from 2.0 to 3.0 mm below the surface.
KeywordsWater Jet PeeningCr-Mo SteelSurface ReformingMicrostructureVoids
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