The individual turbine blades used in the exhaust region of jet engines must withstand high temperatures, high stresses, and highly corrosive operating conditions. These demanding conditions severely limit the material possibilities, and most jet engine turbine blades have been manufactured from one of the high�temperature superalloys. The fabrication processes are limited to those that are compatible with both the material and the desired geometry. Through the 1960s and early 1970s, the standard method of production was investment casting, and the resultant product was a polycrystalline solid with thousands of polyhedral crystals. In the 1970s, production shifted to unidirectional solidification, where elongated crystals ran the entire length of the blade. More recently, advances have enabled the production of single crystal turbine blades. Investigate this product to determine how the various material and processing conditions produce products with differing performance characteristics.
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Chapter 9 Solutions
Degarmo's Materials And Processes In Manufacturing
- answer quicklyarrow_forward2.1 What is the benefit of using investment casting for the production of a turbine rotorcompared to other casting processes?2.2 Which AM materials and processes (according to the ISO/ASTM 52900 standard) ismostly used during the manufacturing of patterns for the investment casting process?List the advantages and disadvantages of each of the AM processes.2.3 What are the advantages and disadvantages of using AM techniques to producepatterns for the investment casting process, compared to conventional methods?2.4 Show with a sketch, how the build orientation of the processes listed in Question 2.2can have an influence on the accuracy and surface quality of a pattern.2.5 Which manufacturing process (listed in Question 2.2) will be most suitable to producea pattern for the turbine rotor? Provide reasons for your selection.2.6 The use of additive manufactured patterns for the investment casting process arebeing used more frequently in industry. Using this technology, comment onproduction…arrow_forwardCan someone please help me to answer the following question completely. PLEASE AND THANK YOU!!!arrow_forward
- 3 Below are a set of carbon fibre propeller blades. Identify the most appropriate construction method for the blades. wole loop viwala lens of voll di woled or blow, Used with permission from Hartzell Propeller. Retrieved from: http://hartzellprop.com/products/propeller- systems/composite-propellers-piston-engine-aircraft/ (A) CNC 3D machining (B) Extrusion (C) Injection moulding (D) Vacuum lay up 020-000 Los of ins (8) asorgob 008 co pronarpent ovew oibersaryollot sdi to doinw no bettimans al 210 Dener SHU THarrow_forwardPlease answer the MCQ's in the imagearrow_forwardP4 Describe the properties and applications of composite products manufactured using manual and automated layup, filament winding, pultrusion and, resin transfer moulding processes.arrow_forward
- "Your boss requests a recommendation on which process to use to make fillet welds on stainless steel rail tank cars with this material. Your heart beating fast, you respond. " A: Use HYPERFILL®. The cooling rate is acceptable for this material and productivity gains are important given the large size of the product. B: "Use HYPERFILL®, for the same reasons as (A), BUT we need to change materials to a low carbon stainless steel (e.g. 304L) or we will get corrosion failure in the HAZ." C: "Use GMAW-P. For this material, this heat input is best. " D: "Use GMAW-P, for the same reasons as (C), but we need to change materials to a low carbon stainless steel (e.g. 304L) or we will get corrosion failure in the FZ."arrow_forwardIn full mould (cavity-less) casting process, the pattern is made of (A) Expanded polystyrene (B) Wax (C) Epoxy (D) Plaster of Parisarrow_forwardThe Allocated alloys are (i) Alloy : Udimet 720 (ii) Technical ceramic : Boron nitride (iii) Polymer/elastomer : Polycarbonate | Question 6 Ta) Explain the microstructural changes that your allocated alloy exhibits during age Thardening. You should use a sketch the microstructure of your material (i) held for 30 I minutes at the solution temperature, (ii) after, subsequently, cooling rapidly from the |solution temperature to room temperature, (ii) after, subsequently, holding at the commercial aging temperature for the prescribed time, to support your explanation. I b) Compare and contrast how precipitates (i) increase the yield strength of some alloys at room temperature, and (i) lower the creep rate of some alloys at elevated temperature. Ic) Your allocated alloy is strengthened by intermetallic precipitates that grow during aging. By both defining an intermetallic and detailing those found in your alloy, explain | why they are so effective at strengthening your material.arrow_forward
- Intense research is underway to develop adiabatic engines that require no cooling of the engine block. Such engines are based on ceramic materials because of the ability of such materials to withstand high temperatures. Write an essay on the current status of adiabatic engine development. Also determine the highest possible efficiencies with these engines, and compare them to the highest possible efficiencies of current engines.arrow_forwardEnumerate and explain each briefly the FOUR (4) Properties of the Bernoulli Process.arrow_forwardWhich of the following processes are the plastic forming methods used in the shaping of traditional ceramics (three correct answers): Odry pressing O extrusion O jangling O jiggering O jolleying Oslip casting O spinningarrow_forward
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