Question: Question 1 (C01, EAC1, C3) Heat treatment process can change the physical properties of a material such as ductility and hardness to make it more

Question 1 (C01, EAC1, C3) Heat treatment process can change the

Question 1 (C01, EAC1, C3) Heat treatment process can change the physical properties of a material such as ductility and hardness to make it more workable. In heating treatment process, a steel ball (made up from stainless steels AISI 304) is heated to certain temperature, Ti and then slowly cooling to 380 K in an air environment within 800 seconds. Given the diameter of steel ball is 18 mm, environmental temperature which T.= 310 K and convection heat transfer coefficient, h = 33 W/m2. K. Using 300 K temperature for thermal properties of the steel. a) Determine the initial temperature, Ti of the steel ball? (6 marks) b) If the steel ball diameter is increased by 30 times, is the lumped system analysis likely to be applicable? Why? (4 marks) [10 MARKS]

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