What is the relation between hardness and tensile properties.it often leads to confusion .is it proper to predict the hardness behaviour of alloys on a general basis from tensile properties.is increse in hardness of alloys leads to increase in tensile properties. And if so what about brittleness and %elongation.
Any answer and analogy
will be highly appreciable.
Refer to the following:
P.Zhang, S.X.Li. and Z.F.Zhang, "General relationship between strength and hardness",Materials Science and Engineering: A, Volume 529, 25 November 2011, Pages 62-73.
Hardness-Strength relationship:
Article Hardness−strength relationships in fine and ultra-fine grain...
Increase in brittleness results in decrease in percentage of elongation, as brittleness is directly proportional to hardness
sigma=0.3xH
See the attached paper by Hutchings in the honour of Tabor or go to the source "The Hardness of Metals by Tabor, Oxford University Press"
Ultimate strength = 0.5HB (kpsi) or 3.4HB (MPa) for steel Shigley's Mechanical Engineering Design (10/e)
A curve fitting for data available from literature for steels.
HRc was the choice since most parts are heat treated and have a hardness over HRc 30 and the Rockwell test is the most used.
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