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4. Metallurgy in the Auto Industry The following illustration appeared in a newspaper article (New York Times: Science Times September 15, 2009) about innovation in the American steel industry. The article outlined efforts to make strong, lightweight steel for cars. heat, C cool ferrite austenite martensite iron carbon carbon Note the cool names for the two alloys, named after a famous British sports car maker. a) What is the packing system for the iron atoms in ferrite? b) Heating the ferrite in the presence of carbon leads to formation of austenite. What is the packing system for the iron atoms in austenite? c) What sort of coordination environment does the carbon occupy in austenite?

4. Metallurgy in the Auto Industry The following illustration appeared in a newspaper article (New York Times: Science Times September 15, 2009) about innovation in the American steel industry. The article outlined efforts to make strong, lightweight steel for cars. heat, C cool ferrite austenite martensite iron carbon carbon Note the cool names for the two alloys, named after a famous British sports car maker. a) What is the packing system for the iron atoms in ferrite? b) Heating the ferrite in the presence of carbon leads to formation of austenite. What is the packing system for the iron atoms in austenite? c) What sort of coordination environment does the carbon occupy in austenite?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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h) Why did the steelworkers introduce the carbon into the metal? What role does it play and how does it work? i) Compare the densities of austenite and martensite. The following space-filling diagrams may help. Assume the unit cells are the same size. + side of cube diagonal across face of cube Austenite Martensite j) Improved gas mileage is an increasingly important goal in car construction. Gas mileage will increase as density: increases decreases k) Which would be lighter weight leading to better gas mileage: austenite martensite + side of cube + side of cube-
Transcribed Image Text:h) Why did the steelworkers introduce the carbon into the metal? What role does it play and how does it work? i) Compare the densities of austenite and martensite. The following space-filling diagrams may help. Assume the unit cells are the same size. + side of cube diagonal across face of cube Austenite Martensite j) Improved gas mileage is an increasingly important goal in car construction. Gas mileage will increase as density: increases decreases k) Which would be lighter weight leading to better gas mileage: austenite martensite + side of cube + side of cube-
4. Metallurgy in the Auto Industry The following illustration appeared in a newspaper article (New York Times: Science Times September 15, 2009) about innovation in the American steel industry. The article outlined efforts to make strong, lightweight steel for cars. heat, C cool ferrite austenite martensite iron carbon carbon Note the cool names for the two alloys, named after a famous British sports car maker. a) What is the packing system for the iron atoms in ferrite? b) Heating the ferrite in the presence of carbon leads to formation of austenite. What is the packing system for the iron atoms in austenite? c) What sort of coordination environment does the carbon occupy in austenite? d) What fraction of these holes are occupied? e) Given this unit cell, what is the ratio of carbon to iron in austenite? f) Careful cooling of the austenite leads to formation of martensite. How would you describe the coordination environment of the carbon in martensite? Note: This is not one of the three coordination geometries discussed. Describe it to the best of your ability. g) If the ratio of iron to carbon in a sample of martensite is 20:1, what does that tell you about the frequency with which carbon atoms occur in martensite unit cells?
Transcribed Image Text:4. Metallurgy in the Auto Industry The following illustration appeared in a newspaper article (New York Times: Science Times September 15, 2009) about innovation in the American steel industry. The article outlined efforts to make strong, lightweight steel for cars. heat, C cool ferrite austenite martensite iron carbon carbon Note the cool names for the two alloys, named after a famous British sports car maker. a) What is the packing system for the iron atoms in ferrite? b) Heating the ferrite in the presence of carbon leads to formation of austenite. What is the packing system for the iron atoms in austenite? c) What sort of coordination environment does the carbon occupy in austenite? d) What fraction of these holes are occupied? e) Given this unit cell, what is the ratio of carbon to iron in austenite? f) Careful cooling of the austenite leads to formation of martensite. How would you describe the coordination environment of the carbon in martensite? Note: This is not one of the three coordination geometries discussed. Describe it to the best of your ability. g) If the ratio of iron to carbon in a sample of martensite is 20:1, what does that tell you about the frequency with which carbon atoms occur in martensite unit cells?
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