the effect of carbon content of the mechanical properties - McMaster ...

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TABLE OF CONTENTS Abstract .......................................................................................................................... iii Acknowledgements ......................................................................................................... v Table Of Contents .......................................................................................................... vi List of Figures ................................................................................................................ xi List of Tables ............................................................................................................... xvi 1. Introduction ............................................................................................................. 1 2. Literature Review .................................................................................................... 3 2.1 Phase Transformations ...................................................................................... 3 2.1.1. Stacking Fault Energy ................................................................................ 3 2.1.2. Twin Formation .......................................................................................... 8 2.1.3. ε-Martensite Formation ............................................................................ 10 2.2 Work Hardening .............................................................................................. 12 2.2.1. Isotropic Strain Hardening ........................................................................ 12 2.2.2. Kinematic Strain Hardening ..................................................................... 14 2.3 TWIP Steels .................................................................................................... 16 2.4 TRIP Steels ..................................................................................................... 17 2.5 High Mn TWIP/TRIP Alloys ........................................................................... 19 vi
2.5.1. Fe-30Mn Steel .......................................................................................... 19 2.5.2. Fe-24Mn TRIP Steel ................................................................................. 20 2.5.3. Fe-22Mn-0.6C TWIP Steel ....................................................................... 23 2.5.4. Fe-22Mn-0.376C TWIP / TRIP Steel ........................................................ 29 2.6 TWIP Model & the Effect of Chemical Composition ....................................... 30 2.7 Iso-work Model ............................................................................................... 32 3. Objectives .............................................................................................................. 33 4. Experimental method ............................................................................................. 34 4.1 Starting Material .............................................................................................. 34 4.2 Heat Treatment & Decarburization .................................................................. 35 4.3 Mechanical Tensile Testing ............................................................................. 36 4.3.1. Monotonic Tensile Tests ........................................................................... 37 4.3.2. Interrupted Tensile Tests .......................................................................... 37 4.3.3. Load-unload Tensile Tests ........................................................................ 38 4.4 Fracture Analysis ............................................................................................. 40 4.5 Metallographic Sample Preparation ................................................................. 41 4.5.1. Cutting and Mounting ............................................................................... 41 4.5.2. Polishing .................................................................................................. 42 4.5.3. Etching ..................................................................................................... 42 vii
Page 1: THE EFFECT OF CARBON CONTENT OF THE
Page 4 and 5: Master of Applied Science (2010) Mc
Page 6 and 7: The kinematic hardening contributed
Page 10 and 11: 4.5.4. Electropolishing ...........
Page 12 and 13: 9. APPENDIX .......................
Page 14 and 15: Figure 2.13 Illustration of TWIP ef
Page 16 and 17: Figure 5.13 XRD ε-Martensite Phase
Page 18 and 19: LIST OF TABLES Table 4.1 Chemical C
Page 20 and 21: M.A.Sc. Thesis - E. E. Yang McMaste
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M.A.Sc. Thesis - E. E. Yang McMaste
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