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KIG 2005 Soalan4 Question 4 a) Lakarkan gambarajah biasa peta ubah bentuk rayapan dengan menerangkan cini-ciri ubah bentuk di setiap kawasan. Terangkan mengapa tidak terdapat kawasan rayapan Coble di sesetengah bahan. Draw a typical creep deformation map and explain the features of each region. Explain why in some materials Coble creep region is not available. (8 markah/marks) b) Nilaikan peningkatan kadar terikan bagi satu bahan dengan tenaga pengaktifan Q 270kJ/mol apabila suhu dinaikkan dari T1 800 °C 1073 K kepada T2 820 °C 1093 K. Evaluate the increase in strain rate for a material with activation energy Q 270k.J/mo when the temperature is increased from T1-8000 C 1073 K to T2 8200 C-1093 K (7 markah/marks)

Engineering materials

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