Micro structure and composition of nanocrystal phase induced by ultrasonic shot peening

R. B. Zhao; Y. M. Xing; P. C. Bai

doi:10.1117/12.839240

25 August 2009 Micro structure and composition of nanocrystal phase induced by ultrasonic shot peening

R. B. Zhao, Y. M. Xing, P. C. Bai

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 737532 (2009) https://doi.org/10.1117/12.839240
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

Ultrasonic shot peening treatment is used to treat structural surfaces, which can enhance the overall strength, stiffness and fatigue life of the treated material. This process induces a layer of nanocrystal grains in the surface of austenitic stainless steel. The microstructure and the composition of the surface layer are examined using X-ray diffraction and transmission electron microscopy. Experimental results show that the grains are mainly composed of oxide nanocrystal particles, NiFe₂O₄, and a few martensite particles. Phase transformations happen during the course of the ultrasonic shot peening. The chemical composition of the nano-layer is (8.03 Cr, 4.32 Ni, 3.86 Cu, 83.79 Fe) (mass %).

Citation Download Citation

R. B. Zhao, Y. M. Xing, and P. C. Bai "Micro structure and composition of nanocrystal phase induced by ultrasonic shot peening", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737532 (25 August 2009); https://doi.org/10.1117/12.839240

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