DETERMINATION OF THIN FILM'S MECHANICAL PROPERTIES

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4 ACKNOWLEDGEMENTS I sincerely thank for the people who mentally support and encourage me, aid me in my pursuing of the M. Sc. degree, and help in my academic accomplishment. Firstly, I would like to thank Prof. Dr. Tevfik AKSOY for his supervision, guidance, patience, and support in this work. I also would like to thank Assoc. Prof. Dr. Mustafa TOPARLI and my all colleagues especially Bahadır UYULGAN, Faruk EBEOGLUGİL and Erhan ÖZKAN for their cooperation, friendship and patience. Finally, I would like to thank my all family and my engaged Aslı ŞIK for their support and persistence. Osman ÇULHA iii
5 DETERMINATION OF THIN FILM’S MECHANICAL PROPERTIES ABSTRACT The surface of industrial component may require treatment to enhance surface characteristic. Surface treatments that cause microstructure changes in the bulk material include heating and cooling/quenching through induction, flame, laser and electron beam techniques, or mechanical treatments. Boriding is one of the thermo chemical surface treatment processes which is extensively used for ferrous and nonferrous materials. In this study, characterization and mechanical properties of FeB and Fe 2 B phases, which were formed on surface of SAE 1020 and SAE 1040 quality steel by boriding technique, were investigated. The aim of this study was to obtain micro structural characteristics and investigate the mechanical properties such as hardness, young’s modulus and fracture toughness of the boride layer. The produced double layer (FeB and Fe 2 B) was extensively analyzed with respect to X-ray diffraction (XRD), scanning electron microscopy (SEM) including energy dispersive spectroscopy (EDS), microhardness and surface roughness. Mechanical properties of layers was examined by Shimadzu Dynamic Ultra-micro Hardness test machine for estimating young’s modulus due to loadunload sensing analysis, in addition to mechanical investigation hardness-depth curves of the layer was obtained. Fracture toughness properties of surface layer FeB was calculated by Vickers Fracture Toughness method with measuring crack length after loading stage is finished. Finite element modeling was performed to determine the yield stress and stress analysis of borided substrates. Keywords: Boriding, micro-indentation, Fracture toughness, Finite Element Method iv
Page 1 and 2: 1 DOKUZ EYLUL UNIVERSITY GRADUATE S
Page 3: 3 M. Sc. THESIS EXAMINATION RESULT
Page 7 and 8: 7 CONTENTS Page THESIS EXAMINATION
Page 9 and 10: 9 4.3 Characterization Studies…
Page 11 and 12: 2 Sharp indentation tests also serv
Page 13 and 14: 4 CHAPTER TWO BORONIZING 2.1 Introd
Page 15 and 16: 6 2.3 Advantages of Boriding Boride
Page 17 and 18: 8 Other advantages of boriding incl
Page 19 and 20: 10 2.4 Boriding of Ferrous Material
Page 21 and 22: 12 Fe 2 B peritectoid reaction at a
Page 23 and 24: 14 elements should not be used for
Page 25 and 26: 16 layer, comprising the exterior (
Page 27 and 28: 18 time. The container should not e
Page 29 and 30: 20 wear, whereas thick layers are r
Page 31 and 32: 22 • Bends and baffle plates for
Page 33 and 34: 24 the indenter load and the actual
Page 35 and 36: 26 Figure 3.3 Schematic diagrams Br
Page 37 and 38: 28 specimen by artificially reducin
Page 39 and 40: 30 Recently, it is shown that since
Page 41 and 42: 32 determine the hardness and modul
Page 43 and 44: 34 From theoretical consideration i
Page 45 and 46: 36 4.2 Materials SAE 1020 and SAE 1
Page 47 and 48: 38 CHAPTER FIVE RESULTS AND DISCUSS
Page 49 and 50: 40 a) b)
Page 51 and 52: 42 a) b)
Page 53 and 54: 44 Average thickness measurement of
Page 55 and 56:
46 5.2 Surface Roughness Measuremen
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48 30000 25000 1020-2-160 1020-4-16
Page 59 and 60:
50 45000 40000 35000 1040-2-320 104
Page 61 and 62:
52 Force (mN) 700 650 600 550 500 4
Page 63 and 64:
54 final or residual depth after un
Page 65 and 66:
56 90 80 70 60 Force (mN) 50 40 30
Page 67 and 68:
58 600 500 1020-2 1020-4 1020-6 400
Page 69 and 70:
60 a) b)
Page 71 and 72:
62 a) b)
Page 73 and 74:
64 a) c)
Page 75 and 76:
66 a) b) Figure 5.14 SEM images of
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
72 5.5 FEM Model In order to improv
Page 83 and 84:
74 The indenter was meshed by appro
Page 85 and 86:
76 a) b) Figure 5.21 Magnified view
Page 87 and 88:
78 720 640 560 Yield Strength=7000
Page 89 and 90:
80 CHAPTER SIX CONCLUSION 6.1 Gener
Page 91 and 92:
82 FeB layer increase from 0.4014 0
Page 93 and 94:
84 H.C. Child, 1981. Metallurgy and
Page 95:
86 Ugur Sen, Saduman Sen, Sakip Kok
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DETERMINATION OF THIN FILM'S MECHANICAL PROPERTIES

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