Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 6.13, Problem 69SEP
To determine
The advantage of developed compressive stress in the casting of thick cylindrical shell.
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4- A spherical riser must be designed for a sand-casting mold. The casting itself is a steel rectangular plate with dimensions 20 cm 10 cm 2.0 cm. Previous observation have indicated that the total solidification time (TTS) for this casting = 3.5 min. determine the diameter of the riser so that it will take 25% longer for the riser to solidify
A flat plate is to be cast in an open mold
whose bottom has a square shape that is 200
mm by 200 mm. The mold is 40 mm deep. A
total of 106 mm3 of molten aluminum is
poured into the mold. Solidification
shrinkage is known to be 6.0%. The linear
shrinkage due to thermal contraction after
solidification is 1.3%. If the availability of
molten metal in the mold allows the square
shape of the cast plate to maintain its 200
mm by 200 mm dimensions until
solidification is completed, determine the
final dimensions of the plate.
Q.3- Choose the correct answer of the following:
1. Injection molding is a type of:
(a) Vacuum casting (b) Centrifugal casting (c) Squeeze casting (d) Die casting
2. From various casting processes, investment casting process is the suitable operation for
manufacturing of:
(a) Engine blocks (b) Gears (c) Jewelry (d) Car wheels (e) Pipes
3. The welding process by (GMAW) process is
(a) Slower than, (b) Faster than, (c) at same speed as (d) at unpredictable speed.
4. The clearance angle is provided on the tools with a view to
(a) Strength the tool. (b) Shear off the metal. (c) Prevent the tool from rubbing on workpiece
(d) Facilitate easy flow of chips.
5. Chances of crack propagation are more in:
(a) Cold working process (b) Hot working process (c) Both of the above (d) None of the above
6. For machining of carbide material which of the following tool will be preferred?
(a) Zero rake angle tools. (b) Large positive rake angle tools. c) Large negative rake angle tools
(d) Small point angle…
Chapter 6 Solutions
Foundations of Materials Science and Engineering
Ch. 6.13 - (a) How are metal alloys made by the casting...Ch. 6.13 - Why are cast metal sheet ingots hot-rolled first...Ch. 6.13 - What type of heat treatment is given to the rolled...Ch. 6.13 - Describe and illustrate the following types of...Ch. 6.13 - Describe the forging process. What is the...Ch. 6.13 - What is the difference between open-die and...Ch. 6.13 - Describe the wire-drawing process. Why is it...Ch. 6.13 - Distinguish between elastic and plastic...Ch. 6.13 - Define (a) engineering stress and strain and (b)...Ch. 6.13 - Define (a) modulus of elasticity, (b) yield...
Ch. 6.13 - (a) Define the hardness of a metal. (b) How is the...Ch. 6.13 - What types of indenters are used in (a) the...Ch. 6.13 - What are slipbands and slip lines? What causes the...Ch. 6.13 - Describe the slip mechanism that enables a metal...Ch. 6.13 - (a) Why does slip in metals usually take place on...Ch. 6.13 - Prob. 16KCPCh. 6.13 - What other types of slip planes are important...Ch. 6.13 - Define the critical resolved shear stress for a...Ch. 6.13 - Describe the deformation twinning process that...Ch. 6.13 - What is the difference between the slip and...Ch. 6.13 - Prob. 21KCPCh. 6.13 - Prob. 22KCPCh. 6.13 - What experimental evidence shows that grain...Ch. 6.13 - (a) Describe the grain shape changes that occur...Ch. 6.13 - How is the ductility of a metal normally affected...Ch. 6.13 - (a) What is solid-solution strengthening? Describe...Ch. 6.13 - What are the three main metallurgical stages that...Ch. 6.13 - Describe the microstructure of a heavily...Ch. 6.13 - Describe what occurs microscopically when a...Ch. 6.13 - When a cold-worked metal is heated into the...Ch. 6.13 - Describe what occurs microscopically when a...Ch. 6.13 - When a cold-worked metal is heated into the...Ch. 6.13 - Prob. 33KCPCh. 6.13 - Prob. 34KCPCh. 6.13 - Prob. 35KCPCh. 6.13 - Prob. 36KCPCh. 6.13 - Prob. 37KCPCh. 6.13 - Why are nanocrystalline materials stronger? Answer...Ch. 6.13 - A 70% Cu30% Zn brass sheet is 0.0955 cm thick and...Ch. 6.13 - A sheet of aluminum alloy is cold-rolled 30% to a...Ch. 6.13 - Calculate the percent cold reduction when an...Ch. 6.13 - Prob. 42AAPCh. 6.13 - What is the relationship between engineering...Ch. 6.13 - A tensile specimen of cartridge brass sheet has a...Ch. 6.13 - A 0.505-in.-diameter rod of an aluminum alloy is...Ch. 6.13 - In Figure 6.23, estimate the toughness of SAE 1340...Ch. 6.13 - The following engineering stress-strain data were...Ch. 6.13 - Prob. 49AAPCh. 6.13 - A 0.505-in.-diameter aluminum alloy test bar is...Ch. 6.13 - A 20-cm-long rod with a diameter of 0.250 cm is...Ch. 6.13 - Prob. 52AAPCh. 6.13 - Prob. 53AAPCh. 6.13 - Prob. 54AAPCh. 6.13 - Prob. 55AAPCh. 6.13 - Prob. 56AAPCh. 6.13 - A specimen of commercially pure titanium has a...Ch. 6.13 - Prob. 58AAPCh. 6.13 - Prob. 59AAPCh. 6.13 - Prob. 60AAPCh. 6.13 - Prob. 61AAPCh. 6.13 - Prob. 62AAPCh. 6.13 - Prob. 63AAPCh. 6.13 - Prob. 64AAPCh. 6.13 - Prob. 65SEPCh. 6.13 - Prob. 66SEPCh. 6.13 - A 20-mm-diameter, 350-mm-long rod made of an...Ch. 6.13 - Prob. 68SEPCh. 6.13 - Prob. 69SEPCh. 6.13 - Consider casting a cube and a sphere on the same...Ch. 6.13 - When manufacturing complex shapes using cold...Ch. 6.13 - Prob. 74SEPCh. 6.13 - Draw a generic engineering stress-strain diagram...Ch. 6.13 - (a) Draw a generic engineering stress-strain...Ch. 6.13 - Prob. 77SEPCh. 6.13 - Prob. 78SEPCh. 6.13 - Prob. 79SEPCh. 6.13 - The material for a rod of cross-sectional area...Ch. 6.13 - What do E, G, v, Ur, and toughness tell you about...Ch. 6.13 - A cylindrical component is loaded in tension until...Ch. 6.13 - Referring to Figures 6.20 and 6.21 (read the...Ch. 6.13 - (a) Show, using the definition of the Poissons...Ch. 6.13 - A one-inch cube of tempered stainless steel (alloy...Ch. 6.13 - Prob. 87SEPCh. 6.13 - Prob. 88SEPCh. 6.13 - Prob. 89SEPCh. 6.13 - Prob. 90SEPCh. 6.13 - Prob. 91SEPCh. 6.13 - Prob. 92SEPCh. 6.13 - Prob. 93SEPCh. 6.13 - Prob. 94SEPCh. 6.13 - Starting with a 2-in.-diameter rod of brass, we...Ch. 6.13 - Prob. 96SEPCh. 6.13 - Prob. 97SEPCh. 6.13 - Prob. 98SEPCh. 6.13 - The cupro-nickel substitutional solid solution...Ch. 6.13 - Prob. 100SEP
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- In sand casting of hollow part of lead, a cylindrical core of diameter 120 mm and height 180 mm is placed inside the mould cavity. The densities of core material and lead are 1600 kg/m3 and 11300 kg/m³ respectively. The net force (in N) that tends to lift he core during pouring of molten metal will bearrow_forwardExample#2 A cylindrical riser with diameter-to-length ratio = 1.0 is to be designed for a sand casting mold. The casting geometry is illustrated in Figure. If the mold constant = 19.5 min/in? in Chvorinov's Rule, determine the dimensions of the riser so that the riser will take 0.5 minute longer to freeze than the casting itself. -2.5- -6.0- -1.5 3.0 2.5 radius - 3.0 5.0 15.0arrow_forwardQ.B3. As part of a project, students have been asked to cast an Aluminium disc for use as a flywheel. The flywheel is part of an engine development project and needs to be 200 mm in diameter and 20 mm thick. Green sand casting will be used. The shrinkage associated with this metal and process is 5% at the solidification stage and further 3 % on cooling to room temperature. Aluminum has a density of 2710 kg/m³ and a melting temperature of 660°C. The pouring temperature is 700°C while the specific heat of aluminum is 887 J/kg.K. The latent heat of fusion of Aluminum is 396 kJ/kg. From previous experiments the Chorinov constant for the mold was found to be 10 s/mm². Determine: a.) The dimensions of the pattern (diameter and thickness) that will need to be made for this part (ignore riser and sprue). b.) The time it will take for complete solidification of the part. c.) Assuming an electric furnace at 10% efficiency is used to heat the metal and it takes around 2 hours achieve pouring…arrow_forward
- A riser in the shape of a sphere is to be designed for a sand casting mold. The casting is a rectangular plate, with length = 100 mm, width = 50 mm, and thickness = 10 mm. If the total solidification time of the casting itself is known to be 2.5 min, determine the diameter of the riser so that it will take 20% longer for the riser to solidify. %3D %3!arrow_forward(b) Describe the following process in metal casting: (i) Melting process (ii) Pouring process (iii) Solidifying processarrow_forward4. A steel rotor of a gas turbine of 400mm outside diameter, 150mm inside diameter and 25mm thick is shrunk onto a solid steel shaft. At its service speed of 3000rev/min the radial stress on the outside of the rotor is 1.45MPA. Determine the shrinkage allowance required in order to avoid failure, if the design stress limit of the material is 200MPA. For the material assume a Young's Modulus, Poisson Ratio and density of 210GPA, 0.3 and 7850k g/m3 respectively.arrow_forward
- Do most of the columns have residual stress? why?arrow_forwarda riser in the shape of a sphere is to be designed for a sand casting mold. the casting is a rectangular plate, with length 200mm, width 100mm, and thickness 18mm. if the total solidification time of the casting itself is known to be 3.5 mm, determine the diameter of the riser so that it will take 25% longer for the riser to solidify. assume a value of 2 for ‘n’ m( the exponent in chvorinov’s rule). know the volume and surface area of a sphere.arrow_forwardA riser in the shape of a sphere is to be designed for a sand casting mould at Simon Castings. The casting is a rectangular plate, with length = 400 mm, width = 250 mm, and thickness = 15 mm. If the total solidification time of the casting itself is known to be 7 min, determine the diameter of the riser so that it will take 30% longer for the riser to solidify.arrow_forward
- Molding of thin section castings are not possible in pressure die casting process. Select one: True Falsearrow_forward(b) In casting experiments performed using a certain alloy and type of sand mould, for which n can be approximately taken as 2, it took 155 sec for a cube-shaped casting to solidify. The cube was 50 mm per side. (i) Determine the value of the mould constant in Chvorinov's rule. (ii) When the same alloy and mould type are used to make a cylindrical casting of diameter 30 mm, what is the maximum length of the cylinder if the maximum solidification time is limited to 1 minute?arrow_forwardEX.3//A cylindrical riser must be designed for a sand-casting mold. The casting itself is a steel rectangular plate with dimensions 7.5 cm x 12.5 cm x 2.0 cm. Previous observations have indicated that the total solidification time (TTs) for this casting =1.6 min. The cylinder for the riser will have a diameter-to-height ratio=1.0. Determine the dimensions of the riser so that its TTS = 2.0 min.arrow_forward
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