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Attractive properties for casting alloys include low melting points, high fluidity (or runniness), and high as-solidified strength. Wrought alloys (those fabricated as solids by processes such as rolling, forging, and extrusion) are best if they possess low yield strength, high ductility, and good strain-hardening characteristics. Reflecting these differences, the Aluminum Association uses distinctly different designation systems-a four-digit number for wrought alloys and a three-digit number for cast. Aluminum casting alloys are often further classified as “recommended for sand casting,” “recommended for permanent mold casting,” and “recommended for die casting.” might different material properties be required for casting into the three different mold materials-sand, cast iron, and water-cooled tool steel? M/hat features or characteristics would be desired for each?
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Degarmo's Materials And Processes In Manufacturing
- The majority of automobile alloy wheels are to be produced from A356 aluminum alloy by low pressure casting technique. Which method/s would you prefer to strengthen the wheels? Justify your answers and explain the detailed procedure steps which you would follow (Hint: You may need to check the related literature and the chemical composition of the alloy in order to determine the right job/s).arrow_forwardA flat plate is to be cast in an open mold whose bottom has a square shape of 12.5 cm by 12.5 cm. The mold is 7.0 cm deep. A total of 350 cm³ of molten aluminum is poured into the mold. Solidification shrinkage is known to be 6.25%, which is a volumetric contraction, not a linear contraction. Table 7.1 lists the linear shrinkage due to thermal contraction after solidification. If the availability of molten metal in the mold allows the square shape of the cast plate to maintain its square dimension until solidification is completed, determine the final dimensions (width and height) of the plate.arrow_forwardNickel-based alloys are used for gas turbine blades in aerospace engines. Briefly discuss the characteristics that make these alloys the choice for this application. Single-crystal technology is applied to nickel alloys that are used as gas turbine blades in aerospace engines. With the aid of sketches describe how a single-crystal casting can be manufactured and explain why a single-crystal casting is likely to have superior creep resistance than a directly-solidified one. Demonstrate the application of the Ten-percent Rule by calculating the approximate tensile strength and elastic modulus in the 0° direction of a carbon-fibre reinforced polymer composite if the strength and elastic moduluş in the 0° single ply are 3620 MPa and 143 GPa respectively. The lay-up sequence of the composite is [02/+45/-45/902]s.arrow_forward
- 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.arrow_forwardState the steps that must be taken to correct the following casting defects: 1. Formation of discontinuity in the casting.- 2. Cast surface consisting of a mixture of sand and metal. 3. Casting with balloon-shaped gas cavity near the surface. 4. Formation of hot tearing in expandable and permanent mold casungs. 5. Metal splatters during pouring and solid globules form and become entrapped in casting.arrow_forward(1) In sand casting, the volumetric size of the pattern is: (a) bigger than, (b) the same as, or (c) smaller than the cast part (2) Machining processes include which of the following (two correct answers): (a) casting, (b) drilling, (c) extrusion, (d) forging, (e) shaping, (f), and painting? (3) Aluminum sections used for making metal doors and windows are made by which process: (a) Rolling, (b) welding, (c) extrusion, (d) turning. (4) The average flow stress is the flow stress multiplied by which of the following factors: (a) n, (b) (1-n), (c) 1/n, or (d) 1/(1+n), where n is the strain hardening exponent? (5) The strength of a brazed joint is typically (a) equal to, (b) stronger than, or (c) weaker than soldered joint? (6) Thread cutting operation is normally performed on which one of the following machine tools: (a) drill press, (b) lathe, (c) milling machine, (d) planer, or (e shaper?arrow_forward
- Use brief sentences, sketches or calculations to answer the following questions:arrow_forward(9,00 Puanlar) A riser in the shape of a sphere is to be designed for a sand casting mold. The casting is a rectangular plate, with 8- length 50 cm, width = 35 cm, and thickness = 4 cm. If the total solidification time of the casting itself is known to be 7,5 min, determine the diameter of the riser so that it will take 30% longer for the riser to solidify. %3D Riser volume: V3(TD3)/6(D%3Ddiameter) Riser area: A=TD2 Casting volume: V-L-Wt (L-Length, W=width, t-thickness) a) 8,41 cm b) O 7,34 cm c) 6.62 cm 11,46 cm Boş bırak KÖnceki 8/43 Sonraki> Каpatarrow_forwardi need the answer quicklyarrow_forward
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