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Microstructural characterization and friction coefficient after the laser shock processing treatment on AISI 316 L stainless steel welds

I. B. ROMAN1, M. H. TIEREAN1,* , J. L. OCAÑA2, C. MUNTEANU3

Affiliation

  1. Transilvania University of Brasov, Romania
  2. Universidad Politecnica de Madrid, Spain
  3. Gheorghe Asachi Technical University Iasi, Romania

Abstract

Laser shock processing (LSP) or laser shock peening is a new technique for improving the properties of materials. The aim of this paper is to analyze the influence of pulse density on friction coefficient and analyze the microstructure. The samples are made of 316 L stainless steel and chemical composition was determinate using EDX. The samples was welded by a Nd:YAG ROFIN laser using 3.3 kW power. In this experiment we use a Nd:YAG laser delivering 2.8 J, 9 ns laser pulses, operating at 10 Hz with infrared (1064 nm) radiation to treat the welded samples. The pulses are focused to a diameter of 1.5 mm. The laser welded 316 stainless steel joints were treated with different pulse density: 900 pulse/cm2 and 1600 pulse/cm2. Microstructures analyzes was carried out by electronic microscopy SEM. Friction test was done using a tribometer. Results reveal the influence of pulse density on friction coefficient..

Keywords

Friction coefficient, Laser shock processing, Stainless steel.

Submitted at: March 25, 2013
Accepted at: July 11, 2013

Citation

I. B. ROMAN, M. H. TIEREAN, J. L. OCAÑA, C. MUNTEANU, Microstructural characterization and friction coefficient after the laser shock processing treatment on AISI 316 L stainless steel welds, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 7-8, pp. 645-649 (2013)