10.1186/2228-5326-2-37

Prevention of weld-decay in austenitic stainless steel by using surface mechanical attrition treatment

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  • Majid Laleh1,
  • Farzad Kargar*1,
  • Alireza Sabour Rouhaghdam2,
  1. Materials Engineering Faculty, Islamic Azad University, Isfahan, 8514143131, IR
  2. Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, 1411713116, IR
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Published in Issue 2012-11-28

How to Cite

Laleh, M., Kargar, F., & Rouhaghdam, A. S. (2012). Prevention of weld-decay in austenitic stainless steel by using surface mechanical attrition treatment. International Nano Letters, 2(1 (December 2012). https://doi.org/10.1186/2228-5326-2-37
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Abstract

Abstract Surface mechanical attrition treatment (SMAT) was applied to the samples of a type AISI 304 stainless steel in order to induce grain refinement as well as formation of twins. Transmission electron microscopy and X-ray diffraction analysis results showed that the average grain size at the surface of the SMATed sample was about 10 nm. The untreated and SMATed samples were then welded using a one-pass gas tungsten arc procedure. The heat-affected zone (HAZ) of the samples was examined by optical microscopy and corrosion tests. Results of the double loop electrochemical potentiokinetic reactivation tests showed that the degree of sensitization in the HAZ for the SMATed sample was very low as compared to that of the untreated one. The pre-SMATed sample was resistant to intergranular corrosion. This is mainly due to the formation of high density of twins which are not prone to carbide precipitation because of their regular and coherent atomic structure and extreme low grain boundary energy as compared with those of other grain boundaries.

Keywords

  • Surface mechanical attrition treatment,
  • Grain refinement,
  • Twins,
  • Welding,
  • Degree of sensitization
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References

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