چكيده به لاتين
In this research, the effect of the silver element on the hardness and microstructure of the A201 alloy, prepared through the SIMA method, and also the effect of heating time in the solid-liquid state were investigated. For this purpose, the A201 alloy without silver and A201 alloy containing 0.44% of weight was prepared through the method of sand casting. Then, by cutting with a turning machine, the size of the samples was reduced to the dimensions required for plastic deformation operation. Using the ECAP Technique, the plastic deformation, during a pass and at ambient temperature on the samples, was performed. In order to investigate the effect of heating time in the semi-solid region on the hardness and microstructure, samples of both alloy were heated at 590 ° C for 5, 10, 15, 20, 25 and 35 minutes. Also, to investigate the effect of heating temperature on these properties, samples of both alloys were heated at 610 and 630 C for 10 and 20 minutes. Data obtained from this study showed that increasing the temperature and heating time lead to decreasing hardness and increasing in the average grain size and seed shape factor in both alloys. Adding silver leads to increasing in hardness significantly and decreasing in the average grain size and shape factor. The optimal setting, obtained from the statistical design of experiments (DOE) method, is heating for 10 minutes at 610 ° C for silver-containing alloy.
Keywords: SIMA method, A201 alloy, ECAP Technique , solid-liquid state, DOE
