The effect of ultrasonic shot peening (USSP) was studied on microstructural modification and mechanical properties such as microhardness, yield strength, tensile strength, and low cycle fatigue (LCF) life of a nitrogen stabilized austenitic stainless steel, at room temperature. There was grain refinement up to nano scale in surface region of the shot peened specimens and the microhardness was increased markedly up to the depth of approximately 100 µm. There was insignificant increase in yield and tensile strength, but drastic reduction in LCF life, particularly at low strain amplitude, from USSP. The nominal increase in yield and tensile strength was due to grain refinement in the surface region and drastic fall in LCF life was due to surface cracking resulting from USSP.
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The authors are thankful to M/S Jindal Steel Limited, Hisar for providing the material and Dr. Chandan Upadhyay for helping in SEM examination.
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Rai, P.K., Pandey, V., Chattopadhyay, K. et al. Effect of Ultrasonic Shot Peening on Microstructure and Mechanical Properties of High-Nitrogen Austenitic Stainless Steel. J. of Materi Eng and Perform 23, 4055–4064 (2014). https://doi.org/10.1007/s11665-014-1180-8
- electron microscopy
- high-nitrogen austenitic stainless steel
- low cycle fatigue
- ultrasonic shot peening (USSP)