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What is the advantage of hardness testing in contrast to tensile testing

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What is the advantage of hardness testing in contrast to tensile testing

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  1. Each reveals a useful property of metal (steel, etc.).  Tensile strength indicates load carrying ability while hardness testing indicates results of heat treatment (soft is ductile and hard is more brittle).  Often only the surface of a metal is treated for hardness and hardness is also related to crack propagation under certain circumstances.

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