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26/11/2019 Diffusional Transformation in Solids Kwame Nkrumah University of Science & Technology, Kumasi, Ghana MSE 553 Defects, Diffusion and Transformation Dr. Emmanuel Gikunoo Materials Engineering Department College of Engineering

  1. 26/11/2019 Diffusional Transformation in Solids Kwame Nkrumah University of Science & Technology, Kumasi, Ghana MSE 553 Defects, Diffusion and Transformation Dr. Emmanuel Gikunoo Materials Engineering Department College of Engineering www.knust.edu.gh 1 2 1 2 Diffusional Transformation in Solids Diffusional Transformation in Solids www.knust.edu.gh www.knust.edu.gh 3 4 3 4 1

  2. 26/11/2019 Diffusional Transformation in Solids Homogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 5 6 5 6 Homogeneous Nucleation in Solids Homogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 7 8 7 8 2

  3. 26/11/2019 Homogeneous Nucleation in Solids Homogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 9 10 9 10 Homogeneous Nucleation in Solids Homogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 11 12 11 12 3

  4. 26/11/2019 Homogeneous Nucleation in Solids Homogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 13 14 13 14 Heterogeneous Nucleation in Solids Heterogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 15 16 15 16 4

  5. 26/11/2019 Heterogeneous Nucleation in Solids Heterogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 17 18 17 18 Heterogeneous Nucleation in Solids Heterogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 19 20 19 20 5

  6. 26/11/2019 Heterogeneous Nucleation in Solids Heterogeneous Nucleation in Solids www.knust.edu.gh www.knust.edu.gh 21 22 21 22 Rate of Heterogeneous Nucleation Rate of Heterogeneous Nucleation www.knust.edu.gh www.knust.edu.gh 23 24 23 24 6

  7. 26/11/2019 Rate of Heterogeneous Nucleation Rate of Heterogeneous Nucleation www.knust.edu.gh www.knust.edu.gh 25 26 25 26 Precipitation Growth Precipitation Growth www.knust.edu.gh www.knust.edu.gh 27 28 27 28 7

  8. 26/11/2019 Growth Behind Planar Incoherent Interfaces Growth Behind Planar Incoherent Interfaces www.knust.edu.gh www.knust.edu.gh 29 30 29 30 Growth Behind Planar Incoherent Interfaces Growth Behind Planar Incoherent Interfaces www.knust.edu.gh www.knust.edu.gh 31 32 31 32 8

  9. 26/11/2019 Growth Behind Planar Incoherent Interfaces Growth Behind Planar Incoherent Interfaces www.knust.edu.gh www.knust.edu.gh 33 34 33 34 Growth Behind Planar Incoherent Interfaces Diffusion-Controlled Lengthening of Plates or Needles www.knust.edu.gh www.knust.edu.gh 35 36 35 36 9

  10. 26/11/2019 Diffusion-Controlled Lengthening of Plates or Needles Diffusion-Controlled Lengthening of Plates or Needles www.knust.edu.gh www.knust.edu.gh 37 38 37 38 Thickening of Plate-Like Precipitates Thickening of Plate-Like Precipitates www.knust.edu.gh www.knust.edu.gh 39 40 39 40 10

  11. 26/11/2019 Overall Transformation Kinetics – TTT Diagrams Overall Transformation Kinetics – TTT Diagrams www.knust.edu.gh www.knust.edu.gh 41 42 41 42 Overall Transformation Kinetics – TTT Diagrams Overall Transformation Kinetics – TTT Diagrams www.knust.edu.gh www.knust.edu.gh 43 44 43 44 11

  12. 26/11/2019 Precipitation in Age Hardening Alloys Precipitation in Age Hardening Alloys www.knust.edu.gh www.knust.edu.gh 45 46 45 46 Precipitation in Age Hardening Alloys Precipitation in Aluminium – Copper Alloys www.knust.edu.gh www.knust.edu.gh 47 48 47 48 12

  13. 26/11/2019 Precipitation in Aluminium – Copper Alloys Precipitation in Aluminium – Copper Alloys www.knust.edu.gh www.knust.edu.gh 49 50 49 50 Precipitation in Aluminium – Copper Alloys Precipitation in Aluminium – Copper Alloys www.knust.edu.gh www.knust.edu.gh 51 52 51 52 13

  14. 26/11/2019 Precipitation in Aluminium – Copper Alloys Precipitation in Aluminium – Copper Alloys www.knust.edu.gh www.knust.edu.gh 53 54 53 54 Precipitation in Aluminium – Copper Alloys Precipitation in Aluminium – Copper Alloys www.knust.edu.gh www.knust.edu.gh 55 56 55 56 14

  15. 26/11/2019 Precipitation in Aluminium – Copper Alloys Quench-In Vacancies www.knust.edu.gh www.knust.edu.gh 57 58 57 58 Quench-In Vacancies Quench-In Vacancies www.knust.edu.gh www.knust.edu.gh 59 60 59 60 15

  16. 26/11/2019 Age Hardening Age Hardening www.knust.edu.gh www.knust.edu.gh 61 62 61 62 Age Hardening Spinodal Decomposition www.knust.edu.gh www.knust.edu.gh 63 64 63 64 16

  17. 26/11/2019 Spinodal Decomposition Spinodal Decomposition www.knust.edu.gh www.knust.edu.gh 65 66 65 66 Spinodal Decomposition Spinodal Decomposition www.knust.edu.gh www.knust.edu.gh 67 68 67 68 17

  18. 26/11/2019 Spinodal Transformation Spinodal Transformation www.knust.edu.gh www.knust.edu.gh 69 70 69 70 Spinodal Decomposition Spinodal Decomposition www.knust.edu.gh www.knust.edu.gh 71 72 71 72 18

  19. 26/11/2019 Spinodal Decomposition Spinodal Decomposition www.knust.edu.gh www.knust.edu.gh 73 74 73 74 Spinodal Decomposition Particle Coarsening www.knust.edu.gh www.knust.edu.gh 75 76 75 76 19

  20. 26/11/2019 Particle Coarsening Particle Coarsening www.knust.edu.gh www.knust.edu.gh 77 78 77 78 Effect of Temperature – Thermal Activation Effect of Temperature – Thermal Activation www.knust.edu.gh www.knust.edu.gh 79 80 79 80 20

  21. 26/11/2019 Effect of Temperature on Solubility Particle Coarsening www.knust.edu.gh www.knust.edu.gh 81 82 81 82 Precipitation of Ferrite from Austenite Precipitation of Ferrite from Austenite www.knust.edu.gh www.knust.edu.gh 83 84 83 84 21

  22. 26/11/2019 Precipitation of Ferrite from Austenite Precipitation of Ferrite from Austenite www.knust.edu.gh www.knust.edu.gh 85 86 85 86 Precipitation of Ferrite from Austenite Precipitation of Ferrite from Austenite www.knust.edu.gh www.knust.edu.gh 87 88 87 88 22

  23. 26/11/2019 Precipitation of Ferrite from Austenite Precipitation of Ferrite from Austenite www.knust.edu.gh www.knust.edu.gh 89 90 89 90 Cellular Precipitation Cellular Precipitation www.knust.edu.gh www.knust.edu.gh 91 92 91 92 23

  24. 26/11/2019 Cellular Precipitation Cellular Precipitation www.knust.edu.gh www.knust.edu.gh 93 94 93 94 Eutectoid Transformations Pearlite Reaction in Fe – C Alloys www.knust.edu.gh www.knust.edu.gh 95 96 95 96 24

  25. 26/11/2019 Pearlite Reaction in Fe – C Alloys Pearlite Reaction in Fe – C Alloys www.knust.edu.gh www.knust.edu.gh 97 98 97 98 Pearlite Reaction in Fe – C Alloys Pearlite Reaction in Fe – C Alloys www.knust.edu.gh www.knust.edu.gh 99 100 99 100 25

  26. 26/11/2019 Pearlite Reaction in Fe – C Alloys Pearlite Reaction in Fe – C Alloys www.knust.edu.gh www.knust.edu.gh 101 102 101 102 Pearlite Reaction in Fe – C Alloys The Bainite Transformation www.knust.edu.gh www.knust.edu.gh 103 104 103 104 26

  27. 26/11/2019 The Bainite Transformation The Bainite Transformation www.knust.edu.gh www.knust.edu.gh 105 106 105 106 The Bainite Transformation Effect of Alloying Elements on Hardenability www.knust.edu.gh www.knust.edu.gh 107 108 107 108 27

  28. 26/11/2019 Effect of Alloying Elements on Hardenability Effect of Alloying Elements on Hardenability www.knust.edu.gh www.knust.edu.gh 109 110 109 110 Effect of Alloying Elements on Hardenability Effect of Alloying Elements on Hardenability www.knust.edu.gh www.knust.edu.gh 111 112 111 112 28

  29. 26/11/2019 Effect of Alloying Elements on Hardenability Continuous Cooling Diagram www.knust.edu.gh www.knust.edu.gh 113 114 113 114 Continuous Cooling Diagram Fibrous and Interphase Precipitation www.knust.edu.gh www.knust.edu.gh 115 116 115 116 29

  30. 26/11/2019 Fibrous and Interphase Precipitation Massive Transformations www.knust.edu.gh www.knust.edu.gh 117 118 117 118 Massive Transformations Massive Transformations www.knust.edu.gh www.knust.edu.gh 119 120 119 120 30

  31. 26/11/2019 Massive Transformations Massive Transformations www.knust.edu.gh www.knust.edu.gh 121 122 121 122 Ordering Transformations Ordering Transformations www.knust.edu.gh www.knust.edu.gh 123 124 123 124 31

  32. 26/11/2019 Ordering Transformations Ordering Transformations www.knust.edu.gh www.knust.edu.gh 125 126 125 126 Ordering Transformations Ordering Transformations www.knust.edu.gh www.knust.edu.gh 127 128 127 128 32

  33. 26/11/2019 Ordering Transformations Ordering Transformations www.knust.edu.gh www.knust.edu.gh 129 130 129 130 Ordering Transformations Ordering Transformations www.knust.edu.gh www.knust.edu.gh 131 132 131 132 33

  34. 26/11/2019 Ordering Transformations www.knust.edu.gh 133 133 34

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