Effect of gold treatment on the mechanical properties of 316L stainless steel

Ooi, , Su Guan (2013) Effect of gold treatment on the mechanical properties of 316L stainless steel. Project Report. UTeM, Melaka. (Submitted)

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Abstract

Austenitic stainless steel 316L is one of the most commonly used stainless steel in various applications, mainly due to its great corrosion resistance and other benefits. However, its drawback is its low value in yield strength which will lead to further wear and tear concern. In this research, the effect of cold rolling on the mechanical properties of the austenitic stainless steel 316L was studied. The previous research outcomes show that austenitic stainless steel 316L has low stacking fault energy, which indicating the austenite will go through transformation into α‟-martensite, when being deformed by various method. This transformation is believed will lead to material hardening. Since cold rolling is one of the preferred methods in industry application, this research used cold rolling as cold work method to refine the material. In the research, the material with original thickness 2mm was cold rolled into different thickness, resulting the cold working of 10% to 69%. Microstructure observation was done on the cold rolled specimens by using optical microscope with magnification up to 1000x. The material was then tested its mechanical properties using tensile testing according to ASTM E8M. Analysis was done on the microstructure observation result to see if there is any change in microstructure behavior as referred to other researches. As the reduction of thickness increased, the yield strength and tensile strength showed increasing trends up to its saturation. The total increase in yield strength was recorded to be 300%, from 250MPa to 1000MPa. In the other hand, the tensile strength had increase for approximately 100%. However, the ductility and toughness showed a significant drop after cold working. Ductility of the material eventually dropped to only 2% after cold rolled up to 69%. The Young‟s modulus showed slight decrease during the beginning of the cold rolling and reach saturation after certain amount of thickness reduction. The specimen with higher cold work percentage had shown higher deformation in the microstructure and induced the α-martensite phase shown in the microstructure

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