Chapter11_frg+pm

Chapter11_frg+pm - Chapter 11 Powder Metallurgy Forging and...

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Chapter 11 owder Metallurgy Forging and Heat Powder Metallurgy, Forging and Heat Treating
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anufacturing Manufacturing • Definition: manufacturing, in its broadest sense, is the process of converting raw materials into product – Design of the product – Selection of the raw material – The sequence of processes through which the product will be manufactured Typical manufacturing methods include – Casting – Forming (Powder Metallurgy and Forging) and Shaping – Machining – Joining – Finishing spection, assembly if required, and testing typically follow Inspection, assembly if required, and testing typically follow
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eading Material Reading Material allister p. 386 Callister p. 386 • AERO3700 course pack – owder Metallurgy Chapter 11/17 p 395 24 – Powder Metallurgy Chapter 11/17 p. 395 – 424 – Forging Chapter 8/14 p. 283 – 309 • Others are mentioned on specific pages as required.
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Powder Metallurgy (P/M) P/M parts are made by compacting powders in suitable ies and then sintering them dies and then sintering them. Sintering refers to heating without melting. Parts are typically < 2.5 kg. yp y g Larger parts can be made to about 50 kg. P/M materials in aero pplications are typically Al- applications are typically Al alloys, Ti-alloys and superalloys. Examples: gears, piston rings, connecting rods. In aircraft - ngine mount supports engine engine mount supports,engine nacelle frames P/M Blisk (Boeing)
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S. Kalpakjian, Manufacturing Engineering and Technology. 3 rd Ed. Addison Wesley. F-14 PM Ti-alloy nacelle frame, welded at arrows.
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Cost Final PM, kg Forged Example savings Part, kg Billet, kg 50% 0.8 1.1 2.8 F-14 Fuselage brace 50% 24.2 82 (big) 143 F-14 Nacelle Frame 20% 0.5 2.5 7.7 F-18 Engine Mount 25% 12.9 25 79.4 F-18 Arrestor Hook pport fitting support fitting
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Advantages of Powder Metallurgy (P/M) • P/M is a net shape process in which parts are produced to be free of defects and have uniform composition and uniform grain size /M parts have mechanical properties similar P/M parts have mechanical properties similar to forged parts but the cost is less than both casting and forging as there are fewer steps volved especially for complex parts with involved especially for complex parts with high strength and hardness • P/M can be used to create new alloys, e.g. echanical alloying which cannot be created mechanical alloying which cannot be created with traditional methods such as in the molten metal
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teps in P/M • Powder production; e.g, by atomization, article sizes range form 0 01 to 1000 Steps in P/M particle sizes range form 0.01 to 1000 μ m • Blending and adding lubricants/binder ompaction to give a ‘green’ compact by CIP • Compaction to give a green compact by CIP or HIP (cold or hot isostatic pressing). A green compact is brittle with low strength but has the correct shape, appropriate density and particle-to-particle contact.
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This note was uploaded on 11/13/2011 for the course CIVE 2*** taught by Professor - during the Spring '11 term at Carleton CA.

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Chapter11_frg+pm - Chapter 11 Powder Metallurgy Forging and...

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