Manufacturing Engineer’s Reference Book P2

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Manufacturing Engineer’s Reference Book P2

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Furthermore, martensite, which is characterised by an acicular appearance, forms progressively over a temperature range as the temperature falls; if the temperature is held constant after the start no further action takes place. Martensite formation produces an expansion related to the carbon content. The mechanical properties of martensite depend on the carbon content; low carbon martensites (less than O.OS%C) have reasonable ductility and toughness, high carbon martensites have no ductility or toughness and extreme hardness and, because of the state of internal stress, are very liable to spontaneous cracking. Thus low carbon martensite can be used for industrial purposes, e.g....

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