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World 3 · Heat Treating Steel · 12 min · PRO

Annealing, microstructure and the Liberty-ship lesson

Soft on purpose, and brittle by surprise

PRO · Materials Testing Lab

World 3: Heat Treating Steel is part of PRO

The first world of Materials Testing Lab is free. PRO opens the other 25 lessons in 6 worlds — simulations, quizzes and all.

  • Steel is iron with a pinch of carbon
  • Heat and quench
  • Tempering
  • Two materials, one part
  • The rule of mixtures
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  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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