ENGI 1553 Materials and Processes, Final Examination, Fall 2017-Dr S. Sidia and
ID: 1766935 • Letter: E
Question
ENGI 1553 Materials and Processes, Final Examination, Fall 2017-Dr S. Sidia and Processs, Final Examination, Fal01- nd rocesses, Final Examination, Fall 2017-.Dr.Ss.Siddiqui a) During rolling, deformation occurs primarily due to friction b) Press forging involves sudden application of force to induce plastic deformation c Burnishing is used for small dimensional changes in a finished product d) Hubbing involves joining two parts where segment of one part protrudes through the other Answer: iv) a) Nickel raises the eutectoid point in steels b) Top of the line brass is commonly called alpha brass. c) Minimum percentage of Cr by weight for passivation to occur is 12% d) Stainless steels are widely used because of their excellent machinability Answer: v) a) Cold rolling can be used for improving bendability of plates. b) Hot extrusion can be easily performed on high strength materials c) Upsetting involves causing multi-directional flow by a forging operation d) Continuous forming is not possible using a cold working process Answer: bExplanation / Answer
3)Statement a is true. Friction is defined as the resistance to rolling in mechanics. When rolling friction occurs energy losses occurs and alsodeformation occurs when the two surfaces are compressed and relaxed.
4) The statement c is true. This says that minimum percetage of Cr by wight for passivation to occur is 12%.
5)The statement b is correct. High strength or difficult to work on metals are hot extruded easily. Extrusion can be continous process annd hot extrusion gets greater result with higher ductility.
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