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Microstructure of a Steel Sprocket and Anodizing Aluminum

Microstructure of a Steel Sprocket and Anodizing Aluminum. Ian Buchanan and Kris Magri Santa Rosa Junior College Engr 45, Younes Ataiiyan December 07, 2009. Ian Buchanan is a Civil Engineering major, hoping to work in construction.

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Microstructure of a Steel Sprocket and Anodizing Aluminum

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  1. Microstructure of a Steel Sprocket and Anodizing Aluminum Ian Buchanan and Kris Magri Santa Rosa Junior College Engr 45, Younes Ataiiyan December 07, 2009

  2. Ian Buchanan is a Civil Engineering major, hoping to work in construction Kris Magri is a Mechanical Engineering major who plans to work in robotics Authors

  3. Part I: Microstructure of a steel sprocket Imperfections, carbon content, and banding

  4. Sprocket Courtesy of Motorcycle Spares, accessed on 11/27/09 http://www.te-motorcyclespares.co.uk/images/Chain%20&%20Sprocket.jpg

  5. Procedure • Desired cuts • Mounted in bakelite • Sanded and polished • Nitric acid solution (Nital) etch • Observe and report

  6. Smooth surface? Sprocket, valley between teeth

  7. Carbon Content Sprocket, bottom of tooth -estimated as 0.3 to 0.6% carbon -using chart from materials lab

  8. Banding Steel sprocket .35%C steel, hot-rolled, courtesy W.C. Leslie, The Physical Metallurgy of Steels, 1981

  9. Mn and C Segregation • For cast steels, Mn segregates into a branched structure that flattens out upon hot rolling • Mn blocks C in austenite • Pearlite forms at concentrated areas of Mn and C

  10. X-ray photographs Mn Branching After rolling courtesy W.C. Leslie, The Physical Metallurgy of Steels, 1981

  11. Banding Anisotropy Sprocket, top of tooth “Peeling” courtesy W.C. Leslie, The Physical Metallurgy of Steels, 1981

  12. -1045 steel -heat treatment -baked on paint from SunStar Products http://sunstar-mc.com/Products.aspx under steel - off-road/mx/street. accessed on 11/27/09

  13. Damascus Steel Modern pattern welded damascus steel, knife blade, from http://damascus.free.fr/f_damas/f_quest/i_steel/dmsc_k_.jpg Hard steel with a water-like appearance from layers of differing carbon content Unlike banding, different phases are macroscopically visible Bars of steel repeatedly doubled over and forge welded to achieve differing layers

  14. Banding and Anisotropy Courtesty of A C Stauffer, D A Koss, J B McKirgan. “”Microstructural Banding and Failure of a Stainless Steel”.Metallurgical and Materials Transactions: A : Physical Metallurgy and Materials Science. Warrendale: Apr 2004. Vol. 35A, Iss. 4; pg. 1317, 8 pgs fracture happens parallel to the bands in tensile sample Stainless steel with the banding microstructure

  15. References W.C. Leslie, The Physical Metallurgy of Steels, 1981 Damascus steel. ( 2009). In Encyclopædia Britannica. Retrieved December  2,  2009, from Encyclopædia Britannica Online: http://search.eb.com/eb/article-9028636 A C Stauffer, D A Koss, J B McKirgan. “”Microstructural Banding and Failure of a Stainless Steel”.Metallurgical and Materials Transactions: A : Physical Metallurgy and Materials Science. Warrendale: Apr 2004. Vol. 35A, Iss. 4; pg. 1317, 8 pgs

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