correlation between hardness and other material properties

[Szasza]

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!

 

[TVP]

There are a number of different equations that include hardness in the following compilation

http://www.gorni.eng.br/e/Gorni_SFHTHandbook.pdf

 

[tomwalz]

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.

http://www.carbideprocessors.com

Good engineering starts with a Grainger Catalog.

 

[drawoh]

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

 

[Wrenchbender]

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.