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

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M.A.Sc. Thesis – E. E. Yang McMaster – Materials Science & Engineering Figure 2.20 OM Revealing Grain Boundaries & Twins with Horizontal Tensile Direction at Various Strain Levels a) 0.0 b) 0.18 c) 0.26 d)0.34 (Allain 2004c) The effect of temperature on the Fe-22Mn-0.6C alloy deformation microstructure was examined by Allain et al. and found to mainly depend on the SFE (Allain 2004b). As the temperature changed, the system thermodynamics were altered and the SFE changed, making different deformation products possible. As temperature decreased, the SFE was reduced resulting in the deformation mechanism to shift from dislocation glide and twinning to ε-martensite transformation (Allain 2004b). The grain size dependence on mechanical properties was also examined for a Fe- 22Mn-0.6C alloy where it was found that an increasing grain size, decreased the yield strength as seen in Figure 2.21a. The slope of the true stress-strain curve remained 24
M.A.Sc. Thesis – E. E. Yang McMaster – Materials Science & Engineering relatively constant with decreasing grain size. The smaller grains had a higher yield strength as described by the Hall-Petch equation, where the strength is inversely proportional to the root of the grain diameter (Equation 2.4) (Bouaziz 2008). a) Figure 2.21 Effect of Grain Size on a) Tensile Behaviour (Bouaziz 2008) b) Twinning Stress (Gutierrez-Urrutia 2010) b) (2.4) An observation of Gutierrez-Urrutia et al. (Gutierrez-Urrutia 2010) was that grain refinement does not suppress deformation twinning or the TWIP effect. As grain size decreased to 3 μm, deformation transformation became more difficult but was not completely suppressed. Considering both SFE and grain size, and the effect on twinning (twinning stress), the smaller grain size had a higher twinning stress compared to the larger grain size (Figure 2.21b). The SFE contribution to the twinning stress was larger than their grain size factor to the twinning stress. Large grain sizes had a significantly smaller grain size contribution to the overall twinning stress and smaller grain sizes had a twinning stress contribution similar to the SFE contribution (Gutierrez-Urrutia 2010). 25
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 8 and 9: TABLE OF CONTENTS Abstract ........
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
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