ch13 - Chapter 13 Types and Applications of Materials...

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Chapter 13 Types and Applications of Materials Concept Check 13.1 Question: Briefly explain why ferritic and austenitic stainless steels are not heat treatable. Hint: you may want to consult the first portion of Section 13.3. Answer: Ferritic and austenitic stainless steels are not heat treatable since "heat treatable" is taken to mean that martensite may be made to form with relative ease upon quenching austenite from an elevated temperature. For ferritic stainless steels, austenite does not form upon heating, and, therefore, the austenite-to-martensite transformation is not possible. For austenitic stainless steels, the austenite phase field extends to such low temperatures that the martensitic transformation does not occur.
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Concept Check 13.2 Question: It is possible to produce cast irons that consist of a martensite matrix in which graphite is embedded in either flake, nodule, or rosette form. Briefly describe the treatment necessary to produce each of these three microstructures. Answer: For graphite flakes, gray cast iron is formed (as described in Section 13.2), which is then heated to a temperature at which the ferrite transforms to austenite; the austenite is then rapidly quenched, which transforms to martensite. For graphite nodules and rosettes, nodular and malleable cast irons are first formed (again
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ch13 - Chapter 13 Types and Applications of Materials...

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