Prabhu, N S and Joseyphus, J and Sankara Narayanan, T S N and Ravi Kumar, B and Mitra, A and Panda, A K (2012) Residual Stress Analysis in Surface Mechanical Attrition Treated (SMAT) Iron and Steel Component Materials by Magnetic Barkhausen Emission Technique. IEEE Transactions on Magnetics, 48(12) (IF-1.363). pp. 4713-4717.
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Surface plastic deformation processes like shot peening (SP) have been extensively used by engineering industries to introduce compressive stresses at the surface to achie-ve superior mechanical properties (especially fatigue and wear resistance). A new family of surface severe plastic deformation processes ((SPD)-P-2) using high-energy balls, widely known as the Surface Mechanical Attrition Treatment (SMAT), is gaining prominence. The investigation addresses the analysis of residual stresses in SMAT-exposed pure iron and SA 516 Grade 70 pressure vessel steel components by Magnetic Barkhausen emission (MBE) technique which is a potential nondestructive evaluation tool. The stresses corresponding to optimized band filter frequencies in MBE technique exhibit good correlation with the X-ray- diffra-ction based residual stress measurement data. The stresses correlate at a filter frequency of 100-250 kHz in the case of pure iron and 100-300 kHz in the case of SA 516 Grade 70 pressure vessel steel. Depth profiling by chemical etch-ing showed that the nature of stresses changed from comp-ressive to tensile. Microhardness measurements revealed an exponential decrease of hardness with depth.
|Uncontrolled Keywords:||Residual Stress; Filter frequencies; Micorhardness measurements|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr. A K Sahu|
|Deposited On:||04 Mar 2013 13:21|
|Last Modified:||14 May 2013 10:03|
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