11900

10922

كارشناسي ارشد

شناسايي و انتخاب و روش ساخت مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1395

سيزده، 81ص.: مصور، جدول، عكس(رنگي)، نمودار

ص. ع. به فارسي و انگليسي

مرتضي شمعانيان، مهدي صالحي

حميدرضا سليمي جزي، مسعود عطاپور

1395/09/13

كتابنامه

مهندسي مواد

ID10922

AbstractImproving the corrosion behavior and wear resistance of steels by surface processing has got a lotof attention economically In this study Fe Al surface composite has been produced using plasmaspraying and FSP To fabricate surface composites a Al 70wt Fe layer with a thickness of 100 m was coated on the low carbon steel substrate using plasma spraying and FSP was applied onthese surfaces from one to four passes FSP was also applied on the surface of steel samples withthe same pass numbers in order to evaluate the effects of reinforcement particles on surfacemicrostructure and properties A tungsten carbide pin with the depth of 0 8 mm was used toperform FSP The pin had the rotation speed and the traverse speed of 700 rpm and 80 mm min respectively Two steel specimens with Al Fe coating were heat treated at 900 for one and twohours to study the role of compounds in surface properties of composite samples X ray diffraction XRD analysis was used to identify the phases which formed on the surface composites and theheat treated samples Optical microscopy and electron backscatter diffraction EBSD were utilizedto study the microstructures Besides the Vickers micro hardness profiles for different sampleswere measured Linear reciprocating wear test was used for investigating the tribologicalperformance of the stir zones SZs To evaluate the corrosion behavior of SZs the electrochemicalimpedance spectroscopy EIS and potentiodynamic polarization tests have been done in 3 5 wt NaCl solution The results revealed that Fe Al in situ Fe Al intemetallics have been formed on thesurface composites Widm nsttaten ferrite plates have been formed in the SZs of the steelspecimens as well as the surface composite considerably The micro hardness of the SZs wasincreased by increasing the pass numbers both for steel and surface composite specimens The SZsof the steel and surface composite which subjected to 4 FSP passes had the average hardness of 284HV and 405 HV respectively The wear behavior of the SZs in both groups of samples wasimproved by increasing the pass number The steel surface processed with 4 passes and the surfacecomposite produced by 3 passes exhibiited the lowest wear rates in their groups The dominantwear mechanism has changed from adhesive to abrasive by increasing the pass numbers in bothtypes of the samples However pass numbers had no considerable effects of coefficients of friction CoFs The corrosion behavior of the steel specimens have been improved by increasing the passnumbers while the sample subjected to 4 FSP passes had the best corrosion resistance withpolarization resistance RP of 46769 K cm2 Between the surface composites the sample whichproduced by one FSP pass showed the best corrosion behavior with the RP of 40940 K cm2 andthe highest corrosion potential Key words Friction stir processing Iron aluminides Plasma spraying Widm nsttaten ferrite Adhesive wear Abrasive wear

مرتضي شمعانيان، مهدي صالحي

حميدرضا سليمي جزي، مسعود عطاپور