I need help determining what kind of metal I tested in class. I know it\'s a typ
ID: 2086423 • Letter: I
Question
I need help determining what kind of metal I tested in class. I know it's a type of steel, it's ferrous and a harder sample. There are SO many kinds of steel though and I have no idea which one it could be
....
It could have also been subjected to a form of heat treatment such as normalizing, quenching, etc. so that makes it much harder for me.
The parameters I measured for the sample are as follows:
Average diameter of 0.493 inch
Height of 0.689 inch
Volume of 0.13333 inch^3
Weight of 17.141grams
Density of 7847.02 kg/m^3
This graph shows the extension (mm) vs. load (N) of the sample when tensile testing at a pull rate of 5in/min.
What kind of steel do I have/heat treatment it was subjected to? Please please please help! It would make this a lot easier for me to do research on and complete my project.
10 ?mExplanation / Answer
As we could see from the graph, the workpiece exhibits excellent ductility. The test component went through substantial plastic deformation before it breaks.
If we observe Initial region, the stress is proportional to strain, and then there is a yielding region and necking happened before fracture. So the workpiece is Mild-steel.
Heat treatment It went through is Annealing or Normalizing.
We could observe following from microscope.
As we could see from microscopy analysis, the component has tiny dimples on failure surface. It indicates ductile failure of the component.
1)Ductile fracture occurs due to substantial plastic deformation at crack tip.
2)First, large particles let loose or break, forming widely spaced holes close to the crack tip.
3)Finally, holes are formed at myriads of smaller particles. These holes or voids join up to complete the fracture.
4)Because of its irregularity, the fracture surface diffuses the light and looks dull grey.
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