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correlation between hardness and other material properties

correlation between hardness and other material properties

correlation between hardness and other material properties

(OP)
Hi,

Does anybody knows any equation about the correlation of the hardness and other mechanical properties?
I'm interested in any eqs.
If You know something, please give me a link or a title of a book.

THX!

RE: correlation between hardness and other material properties

In my world of tungsten carbide, hardness used to correlate with wear properties.  That has become a considerably less direct relationship in the last decade or so.   So the date of the correlation formulas should be taken into account.      

Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com

Good engineering starts with a Grainger Catalog.    

RE: correlation between hardness and other material properties

Szasza,

   My old, college metallurgy textbook has a table showing all sorts of hardness numbers correlated to tensile strength for steel.

   According to my textbook Brinell Hardness is...

HB = L / ((3.14159D/2)(D - sqrt(D2 - d2)))...

   Where L is the test load in kilograms, D is the diameter of the ball in millimeters, and d is the diameter of the resulting impression in millimeters.

   If you can construct your equation out of that, I congratulate you.  Failing that, I suggest reading your metallurgy textbook.

               JHG

RE: correlation between hardness and other material properties

Try these.
http://www.onlinemetals.com/hardness.cfm
Machinery's Handbook
ASM Handbook

Any correlation between mech'l props and hardnesses will be approximations.  I once regressed an empirical eqn into data from one of the published charts. Here it is, no guarantee: Cubic Poynomial fit:  y = 86.2163 + .681282x - .00106x^2 + .001094x^3; where y = tensile strength in ksi, x = HRC.

As a further approximation to an approximation, yield strength for steel runs around 85% of UTS, but you're on thin ice.  

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