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  1. I have been reading various literature on the topics of heat treating and tempering and appeared to have come across inconsistent -even contradictory- information regarding tempering. On the one hand there is the school of thought that says hardness and toughness are DIRECTLY inversely proportional to one another. That is, the harder you get a steel, the less tough it is and this can be controlled via hardening and quenching techniques and/or tempering. On the other hand there appears to be the line of thought that tempering actually ADDS performance to a steel in the sense that you can reduce the brittleness greatly but not lose out on much hardness.. which goes againt the first school of thought. Now does anyone actually know what is going on with the martensitic structure during tempering and how a steel might possibly be less brittle yet still hard, and more importantly what is everyone experience in the matter? Which school of thought is true in practice? Also, would triple tempering contribute to this effect that tempering seems to add to steel?
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