Tempered martensitevsmartensite

The M33, M198, M34 codes might need to be changed based on the M codes your machine will use for extending the arm, measuring and retract the arm..

Tempered martensitemicrostructure

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The micrographs below show the effect of annealing at different temperatures on a sample of Fe - 0.7 wt % C steel in which martensite has been formed by quenching. Because of the low carbon content the martensite is relatively dispersed. In this tempering process, martensite precipitates Fe3C in an a-iron matrix and the micrographs show how the cementite phase changes its shape to minimize its surface to volume ratio. The ideal final morphology would be spherical cementite particles in the matrix and this class of tempered martensite is known as spheroidite. They have less elastic strain than martensite and the carbide phase is more dispersed giving a more ductile material.Pearlite and bainite can also have their cementite morphology changed to this spheroidite structure by tempering, but the process requires a longer time.

Tempered martensiteproperties

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Tempered martensitehardness

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From: Schafer, Saxena, Antolovich, Sanders and Warner, "The Science and Design of Engineering Materials," McGraw Hill (1999)

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