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EXTRINSIC INFLUENCE OF COATING AND SURFACE TREATMENT ON THE TENSILE RESPONSE AND FRACTURE BEHAVIOR OF THREE HIGH STRENGTH METALS

Paul, Arindam
http://rave.ohiolink.edu/etdc/view?acc_num=akron1470404392

Abstract Details

2016, Master of Science in Engineering, University of Akron, Mechanical Engineering.
In recent years, starting with the early 1980’s, the use of protective coatings on the surface of a material chosen for use in a specific structure or component has been shown to be an economically affordable and potentially viable alternative to improve and/or enhance the mechanical properties of a material, enhance the resistance to environment-induced degradation or corrosion, and even offer enhanced resistance to wear. In this research study the extrinsic influence of surface treatment, referred to as “HEMF”, on tensile properties and resultant fracture behavior of three metals, a viable selection for use in a spectrum of high performance applications, was conducted with care and caution. “HEMF” is referred to the surface-treatment process wherein fine objects, microscopic in dimension, are made to impact with surface of the chosen specimen at a very high speed and force. Test results reveal that the innovative surface treatment did increase the yield strength, tensile strength and ductility of the chosen stainless steel 17-4PH. However the surface treatment was observed to have an adverse influence on both strength and ductility of the chosen aluminum alloy 7075-T6. For alloy steel 300M both the yield strength and tensile strength decreased for the longitudinal orientation but revealed an increase in the transverse orientation. Surface preparation was observed to have a detrimental influence on ductility of the alloy steel 300M. Kinetics governing tensile response and fracture behavior, at both the macroscopic and fine microscopic levels, will be highlighted in light of nature of loading, presence of surface treatment and intrinsic microstructural effects. Coating that is preferentially chosen for purpose of improving the corrosion resistance of metals when exposed to aggressive environments. In this research study the results of chromium nitride, ferritic nitro carburized and titanium anodized coatings was used as a surface coating on three widely chosen and used metal alloys tested both on air and after hydrogen exposure is presented and briefly discussed. The three metals chosen were 17-4 PH stainless steel, a high strength alloy steel (300M) and a high strength aluminum alloy (7075). Results showing the effect of the coatings on the tensile properties of the metal alloys tested on two different environment are discussed below.
Tirumalai Srivatsan (Advisor)
Gary Doll (Committee Co-Chair)
144 p.
Materials Science; Mechanical Engineering; Metallurgy
tensile response, tensile fracture surface, SEM, chromium nitride, ferritic nitro carburized, titanium anodized, HEMF, Hydrogen exposure

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Citations

  • Paul, A. (2016). EXTRINSIC INFLUENCE OF COATING AND SURFACE TREATMENT ON THE TENSILE RESPONSE AND FRACTURE BEHAVIOR OF THREE HIGH STRENGTH METALS [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1470404392

    APA Style (7th edition)

  • Paul, Arindam. EXTRINSIC INFLUENCE OF COATING AND SURFACE TREATMENT ON THE TENSILE RESPONSE AND FRACTURE BEHAVIOR OF THREE HIGH STRENGTH METALS. 2016. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1470404392.

    MLA Style (8th edition)

  • Paul, Arindam. "EXTRINSIC INFLUENCE OF COATING AND SURFACE TREATMENT ON THE TENSILE RESPONSE AND FRACTURE BEHAVIOR OF THREE HIGH STRENGTH METALS." Master's thesis, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1470404392

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.