Questions about hardness test on metals. Please...

[jpschwartz]

I´m a newbie on the subject, so I need some answers. Please?

How is related hardness metals with its structure, grain size and composition?

How can I modify the hardness of a metal?

How must the surface be to perform a hardness test?

Thanks, I really need HELP !!!

 

[mcguire]

You're really asking the members to teach you metallurgy 101. Why not try to study the subject first and then ask a little more focussed question?

 

[metman]

jp,
mcguire is correct but maybe we can whet yuor appetite a lttle.

copied below from your query: with INSERTS

I´m a newbie on the subject, so I need some answers. Please?

WHY DO YOU NEED ANSWERS? JUST CURIOUS? OR DO YOU HAVE A SPECFIC PROBLEM?
How is related hardness metals with its structure, grain size and composition?

ALL OF THE ABOVE.

How can I modify the hardness of a metal?

PURE OR ELEMENTAL METALS WORK-HARDEN BY COLD WORKING (COLD MEANING BELOW THE RECRYSTALLIZATION TEMPERATURE). THE HARDNESS IS MODIFIED TO SOFTER BY ANNEALING. SOME METAL ALLOYS ARE SUSCEPTIBLE TO HARDENING BY HEAT TREATING. FOR EXAMPLE; QUENCH AND TEMPER AND SOME BY SOLUTION TREATING AND PRECIPITION HARDENING. AGAIN YOU WILL NEED TO DO SOME READING TO UNDERSTAND THESE TERMS.

How must the surface be to perform a hardness test?

SHOULD BE A RELATIVELY SMOOTH SURFACE BUT TYPICALLY NO PREP NEEDED EXCEPT IN SPECIAL CASES AS NOTED IN A RECENT THREAD RIGHT HERE.

Thanks, I really need HELP !!!
WHY DO NEED HELP? ELABORATE! Jesus is The TRUTH

 

[DrWho]

If your interest is in the arena of "Non-ferrous Metals" a good place to seek answers to some, if not all of your questions would be:
Aluminum Casting Technology
2nd Edition
Available from: American Founfrymen's Society.
Web address:

http://www.afsinc.org

Another site for information:

http://www.industrialheating.com

Another site for information:

http://www.moderncasting.com

Another site for information:

http://www.founddrymag.com

Feel free in dropp me a note on specific's at:
drwho650@yahoo.com ->)