(a) Using sketches, describe the carburisation process for steel components. (b) The yield stress for a metal changes from 450 Nmm-2 to 610 Nmm-2 when the average grain diameter decrease from 0.043 mm to 0.022 mm. Determine the yield stress for the same metal with an average grain diameter of 0.030 mm. (c) From the point of view of corrosion, Describe and discuss, using sketches and examples the use of metallic coatings. (d) Discuss the advantages and disadvantages of hot and cold working of metals. (e) Describe and discuss the ionic bonding process. 2. (a) A polypropylene specimen has a mass of 28 kg and density of 1.65x103 kgm-3 . Determine the crystallinity by weight of the specimen. Use the following information, Density of the crystalline phase = 1.77x103 kgm-3 Density of the amorphous phase = 1.43x103 kgm-3 (b) A standard Vickers Hardness test was conducted on a metal specimen. Determine the Vicker’s hardness number and the tensile stress of the specimen. The applied load was 10 kgf, and the standard indenter left an indentation with diagonal d = 0.265 mm. Assume that the metal is hard. (c) (i) Sketch the microstructure of Pearlite and Hypoeutectoid stell. (ii) Determining the weight percentage, Wt% and weight of Proeutectoid ferrite and Pearlite in a 530 kg, hypo-eutectoid steel alloy with a nominal carbon content of 0.25 %. Clearly show the equations and calculations. (d) A tensile test was carried out on a metal specimen. The gauge length of the specimen was 90 mm, and the initial (original) cross sectional area was 15.56 mm2 . The final (fractured) length was 103.4 mm, and the final cross-sectional area was 14.40mm2 . Determine the percentage elongation and percentage reduction in area of the specimen.
(a) Using sketches, describe the carburisation process for steel components.
(b) The yield stress for a metal changes from 450 Nmm-2
to 610 Nmm-2 when the average grain diameter decrease from 0.043 mm to 0.022 mm. Determine the yield stress
for the same metal with an average grain diameter of 0.030 mm.
(c) From the point of view of corrosion, Describe and discuss, using sketches and
examples the use of metallic coatings.
(d) Discuss the advantages and disadvantages of hot and cold working of metals.
(e) Describe and discuss the ionic bonding process.
2. (a) A polypropylene specimen has a mass of 28 kg and density of 1.65x103 kgm-3
.
Determine the crystallinity by weight of the specimen.
Use the following information,
Density of the crystalline phase = 1.77x103 kgm-3
Density of the amorphous phase = 1.43x103 kgm-3
(b) A standard Vickers Hardness test was conducted on a metal specimen. Determine the
Vicker’s hardness number and the tensile stress of the specimen. The applied load
was 10 kgf, and the standard indenter left an indentation with diagonal d = 0.265 mm.
Assume that the metal is hard.
(c) (i) Sketch the microstructure of Pearlite and Hypoeutectoid stell.
(ii) Determining the weight percentage, Wt% and weight of Proeutectoid ferrite
and Pearlite in a 530 kg, hypo-eutectoid steel alloy with a nominal carbon
content of 0.25 %. Clearly show the equations and calculations.
(d) A tensile test was carried out on a metal specimen. The gauge length of the specimen
was 90 mm, and the initial (original) cross sectional area was 15.56 mm2
. The final
(fractured) length was 103.4 mm, and the final cross-sectional area was 14.40mm2
.
Determine the percentage elongation and percentage reduction in area of the
specimen.
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