Dear sir,
Greetings for the day
Mild steel - BCC structure (body centred cubic )
Austenite stainless steel - FCC structure (face centered cubic)
Martensite - FCT structure ( face centred tetragonal )
coarse grain means - less FCT crystals , fine grain means - More FCT crystals.
Tetragonal structure can't absorb more impact energy , due to its crystal structure , since it prevents its movement . if it's fine grain , still more difficulty to absorb energy .
That's why FCC crystals have better impact properties than any other in the steel family .Fine Grain FCC - greater impact energy absorption.
Regards
Vinoth kannaQC- welding & piping inspector
Manifa Project
API -510, CSWIP 3.1, NDT level II - UT, RT ,PT, MT, VT,LT,Infrared & Thermography
Technical - Metallurgy
On Thu, Mar 25, 2021 at 8:43 AM EmaD FaRaHanI <emad.farahani@gmail.com> wrote:
Dear Friends,--Consider we have a mild-steel, cooling fast from welding temperature, we must have a fine grain structure with martensite formation.Hypothetically, considering that we want to use this structure. I was wondering what is the relation between the impact energy and the structure? will it be decreased due to martensite formation? or increased due to fine grain? I understand that we don't use the martensite state of structures and we need to quench and tempering them.Thanks,Emad
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