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Education is a wonderful thing. If you couldn't sign your name you'd have to pay cash

Education is a wonderful thing. If you couldn't sign your name you'd have to pay cash -Rita Mae Brown (1944--), U.S. novelist. The Fe-C system. Hypoeutectoid steels - strength vs P content. Martensite (MAR). Quenching suppresses diffusion AUS –– > P rxn doesn't go!.

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Education is a wonderful thing. If you couldn't sign your name you'd have to pay cash

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  1. Education is a wonderful thing. If you couldn't sign your name you'd have to pay cash -Rita Mae Brown (1944--), U.S. novelist

  2. The Fe-C system Hypoeutectoid steels - strength vs P content

  3. Martensite (MAR) Quenching suppresses diffusion AUS ––> P rxn doesn't go! But something has to happen - a. too much carbon for FE b. AUS needs to change structure AUS ––> MAR (very fine structure)

  4. Martensite (MAR) MAR is metastable…… C is trapped in wrong structure MAR comes from AUS AUS wants to exsolve C & change atom arrangement

  5. Martensite (MAR) martensite start martensite finish Transformation to MAR is time independent ….but temperature dependent

  6. Martensite (MAR) TTT curves & MAR formation

  7. Martensite (MAR) Very hard, very strong due to: solution hardening by xs carbon residual internal strain But……

  8. Martensite (MAR) Toughness = ??

  9. Hardenability Definitions - For steels: harden = make MAR hardenability = ability to make MAR

  10. Review today's notes a. what is martensite b. why is martensite c. martensite properties Read text: pp 277-290; 302-314 Do problems in text: 9.55, 9.57, 10.14, 10.16

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