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    The amount of the high temperature phase transformed to martensite depends to a large extent upon the temperature attained in cooling, there being a rather distinct beginning temperature. (2) A metastable phase of steel, formed by a transformation of austenite below the Ms (or Ar”) temperature.

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    The higher temperature alloys like aluminum, brass, and magnesium work best for functional components that require 5935-4 Andresen Ch02 R3 101404 Product Design 33 dimensional stability, strength, and wear resistance. The low temperature alloys of zinc are the choice where high quality surface finish is important.

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