DEVELOPMENT OF NEW TECHNIQUE FOR NANO IRRADIATION OF STAINLESS STEELS 304 | ||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||
| Article 40, Volume 15, 15th International Conference on Applied Mechanics and Mechanical Engineering., May 2012, Pages 1-12 PDF (1.97 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/amme.2012.36945 | ||
| Author | ||
| H. Ahmed | ||
| Dr. Eng., Consultant in materials sciences & materials applications, Egypt. | ||
| Abstract | ||
| ABSTRACT In this work, new method for surface treatment of the material by laser irradiation was investigated; the experimental works were conducted to study the effect of laser irradiation on the improvement of the mechanical properties of the alloys. Excimer laser at 193nm were used at the same power of 6mJ and repetition rate of 200 Hz. Nanoindentation technique was used to determine film hardness, stiffness and elastic modulus using a nano test instrument form with diamond indenter. The peak loads in the range 1 – 200 mN were used, with variable loading rate in proportion to the peak loads starting at a value of 0.05 mN/s. The hardness and reduced modulus have been determined from these indentation curves using a method originally proposed by Oliver and Pharr, which fits a power-law function to the unloading curve. The qualitative method of microstructure analysis of the samples has been examined before and after laser irradiation at different test conditions to explain the change in mechanical properties according to the change in microstructure features. | ||
| Keywords | ||
| Surface treatment; Iron alloys; Microstructure; Laser applications; Ultraviolet sources | ||
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