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Fracture surface analysis by SEM
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FRACTURE SURFACES OF HIGH Mn STEEL AFTER CHARPY IMPACT TEST

Depending on the ability of material to undergo plastic  deformation before the fracture two fracture modes can be  defined - ductile or brittle.

                    • Ductile fracture - most metals

 Extensive plastic deformation ahead of crack

 Crack is “stable”: resists further extension unless applied stress is increased

·        Brittle fracture - ceramics, ice, cold metals:

 Relatively little plastic deformation

 Crack is “unstable”: propagates rapidly without increase in applied stress



 

 
 
 
 

 

 

This is fracture surface of high Mn steel sample after rolling which shows a combined brittle and ductile fracture. The features are many ductile dimples ,voids indicating the ductile failure, and cleavage planes (flat planes with small atomic steps indicating brittle fracture.

 

 

This is a fracture surface of solution annealed high Mn steel sample shows a complete ductile fracture having small and uniform dimples.

 

 

 

 

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