Improvement of mechanical properties and fatigue life by shot peening process on ASTM A516 Grade 70 steel


  • Mohd Rashdan Isa Universiti Tenaga Nasional
  • Omar Suliman Zaroog Universiti Tenaga Nasional
  • Kalaikathir Murugan Universiti Tenaga Nasional
  • Sharif Osman Kabashi Guma Universiti Tenaga Nasional
  • Fareg Saeid Ali Universiti Tenaga Nasional



Shot peening, hardness, tensile, microstructure, fatigue


ASTM A516 Grade 70 is widely used in the industrial sector as it provides very good mechanical properties in tough conditions. The main usage of this material is in moderate and low operating services. This paper focuses on the effect of shot peening process on ASTM A516 Grade 70 on improving the mechanical properties and fatigue life of the material. Samples have been shot peened with steel shot to induce compressive residual stress. Hardness, tensile and fatigue test as well as microstructure were done on the samples before and after shot peening process to study the effects on mechanical properties. The result shows that there is an increment in every test after shot peening process. There is a slight increment of 0.47% in hardness value, 0.39% increment in tensile strength and 6.78% increment in fatigue life of the material after shot peening process applied. The slight increment in every result was due to the low intensity of the shot peening process. Result also shows that the shot peening process compressed the molecules closer to each other as can be seen under SEM. Therefore it was proven that in this study, there is a very significant improvement in mechanical properties and fatigue life by shot peening process on ASTM A516 Grade 70 Steel.


Alias, S. K., Abdullah, B., Jaffar, A., Latip, S. A., Kasolang, S., Izham, M. F., et al. 2013. Mechanical properties of paste carburized ASTM A516 steel. Procedia Engineering, 68, 525-530. doi: 12.216

Bae, H., Lee, K., Pyo, S., Choi, S. 2016. Abnormality in using cyclic fatigue for ranking static fatigue induced slow crack growth behavior of polyethylene pipe grade resins. Polymer Testing, 55, 101-108. doi: j.polymertesting.2016.07.015

Dieng, L., Amine, D., Falaise, Y., Chataigner, S. 2017. Parametric study of the finite element modeling of shot peening on welded joints. Journal of Constructional Steel Research, 130, 234-247. doi:

Kida, K., Koga, J., Santos, E. C. 2017. Crack growth and splitting failure of silicon nitride ceramic balls under cyclic pressure loads. Mechanics of Materials, 106, 58-66. doi:

Martins, R. F., Ferreira, L., Reis, L., Chambel, P. 2016. Fatigue crack growth under cyclic torsional loading. Theoretical and Applied Fracture Mechanics, 85, Part A, 56-66. doi:

Morabito, A. E., Chrysochoos, A., Dattoma, V., Galietti, U. 2007. Analysis of heat sources accompanying the fatigue of 2024 t3 aluminium alloys. International Journal of Fatigue, 29, 5, 977-984. doi:

Xu, C., Sheng, G., Wang, H., Jiao, Y., Yuan, X. 2017. Effect of high energy shot peening on the microstructure and mechanical properties of mg/ti joints. Journal of Alloys and Compounds, 695, 1383-1391. doi: