microstructure of a steel sprocket and anodizing aluminum ian buchanan and kris magri santa rosa...
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Microstructure of a Steel Sprocket and Anodizing
AluminumIan Buchanan and Kris Magri
Santa Rosa Junior College
Engr 45, Younes Ataiiyan
December 07, 2009
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Authors
• 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
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Part I: Microstructure of a steel sprocket
Imperfections, carbon content, and banding
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Sprocket
Courtesy of Motorcycle Spares, accessed on 11/27/09http://www.te-motorcyclespares.co.uk/images/Chain%20&%20Sprocket.jpg
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Procedure
• Desired cuts
• Mounted in bakelite
• Sanded and polished
• Nitric acid solution (Nital) etch
• Observe and report
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Smooth surface?
Sprocket, valley between teeth
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Carbon Content
Sprocket, bottom of tooth
-estimated as 0.3 to 0.6% carbon
-using chart from materials lab
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Banding
.35%C steel, hot-rolled, courtesyW.C. Leslie, The Physical Metallurgy of Steels, 1981
Steel sprocket
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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
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X-ray photographs
courtesyW.C. Leslie, The Physical Metallurgy of Steels, 1981
Mn Branching After rolling
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Banding Anisotropy
“Peeling”
Sprocket, top of tooth
courtesyW.C. Leslie, The Physical Metallurgy of Steels, 1981
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-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
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Damascus Steel
• 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
Modern pattern welded damascus steel, knife blade, from http://damascus.free.fr/f_damas/f_quest/i_steel/dmsc_k_.jpg
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Banding and Anisotropy
• fracture happens parallel to the bands in tensile sample
• Stainless steel with the banding microstructure
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
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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