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What are the possibilities for microstructures in the HAZ for: a hardened steel

Determine the hardness 0.15" in from the surface of a 3" diam. 4640 shaft which has been quiet oil-quenched. Determine the hardness 0.15" in from the surface of a 3" diam. 4640 shaft which has been quiet oil-quenched. Use the appropriate set of bar size/quench curves from the website.

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What are the possibilities for microstructures in the HAZ for: a hardened steel

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  1. Determine the hardness 0.15" in from the surface of a 3" diam. 4640 shaft which has been quiet oil-quenched.

  2. Determine the hardness 0.15" in from the surface of a 3" diam. 4640 shaft which has been quiet oil-quenched. Use the appropriate set of bar size/quench curves from the website.

  3. Determine the hardness 0.15" in from the surface of a 3" diam. 4640 shaft which has been quiet oil-quenched. Use the appropriate set of bar size/quench curves from the website. The curve below is for 4640.

  4. What are the possibilities for microstructures in the HAZ for: a hardened steel a precipitation hardened alloy

  5. What are the possibilities for microstructures in the HAZ for: a hardened steel a precipitation hardened alloy

  6. Not a description of a type of corrosion cell: electrolyte concentration b. dissimilar metals c. non-homogeneous stress distribution d. active-passive regions e. none of the above

  7. Not a way to suppress corrosion: use a carbon steel filler rod when welding stainless steel b. paint the metal c. anneal the metal piece d. make the metal electrically negative e. use a steel containing a considerable amount of chromium

  8. The microcell mainly responsible for corrosion in sensitized stainless steels consists of which of these anode/cathode combinations: Fe metal/Cr metal b. low Cr content solid solution/high Cr content solid solution c. Fe-Cr solid solution/Cr7C3 d. grain boundary/central portion of grain e. high Cr content solid solution/low Cr content solid solution

  9. Not an example of a corrosion microcell: a deeply scratched galvanized coating on steel b. bulk of a grain/grain boundary region c. solid solution matrix/precipitate particles d. segregation e. grain A/neighboring grain B

  10. A way to "un-sensitize" a sensitized austenitic stainless steel part cold work it b. pack carburize it c. harden and temper it d. hold it at an appropriately high temperature for an extended period of time e. plate it with chromium

  11. Define: Alcohol Acid Ester Amine Amide

  12. Define: Alcohol ---- OH Acid Ester Amine Amide

  13. Define: Alcohol ---- OH Acid ---- COOH Ester Amine Amide

  14. Define: Alcohol ---- OH Acid ---- COOH Ester –COO– Amine Amide

  15. Define: Alcohol ---- OH Acid ---- COOH Ester –COO– Amine ---- NH2 Amide

  16. Define: Alcohol ---- OH Acid ---- COOH Ester –COO– Amine ---- NH2 Amide –CONH–

  17. Define: Condensation reaction Addition reaction Polymerization

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