Help on microstructure identification
Help on microstructure identification
(OP)
Dear all,
I have 3 different steel samples in which I have taken a microstructure photo of them as the link below. I was only given the specifications of the steels, but not the chemical composition. My questions is, are these steel martensitic steel (tempered), with precipitations? The application of these steels are to use as strapping material, which is subjected to high load, tensioning, and probably relatively high impact load.
Thank you.
Jeffrey
Sample 1 - ht tp://www.f lickr.com/ photos/826 69020@N00/ 247288926/
Sample 2 -
ht tp://www.f lickr.com/ photos/826 69020@N00/ 247290706/
Sample 3 -
ht tp://www.f lickr.com/ photos/826 69020@N00/ 247290707/
I have 3 different steel samples in which I have taken a microstructure photo of them as the link below. I was only given the specifications of the steels, but not the chemical composition. My questions is, are these steel martensitic steel (tempered), with precipitations? The application of these steels are to use as strapping material, which is subjected to high load, tensioning, and probably relatively high impact load.
Thank you.
Jeffrey
Sample 1 - ht
Sample 2 -
ht
Sample 3 -
ht





RE: Help on microstructure identification
RE: Help on microstructure identification
RE: Help on microstructure identification
Could you have your samples hardness tested?
Can you determine if the material is magnetic?
If it is indeed tempered martensitic microstructure then what is the conclusion you would like to reach?
http://www.welding-advisers.com/
RE: Help on microstructure identification
so anyone, any idea what structure is that?
Thanks.
RE: Help on microstructure identification
Samples 2 and 3 look more like mixed microstructures containing ferrite/carbides/and bainite. The carbides appear to be arranged in colonies of fine pearlite (dark islands) at least in samples 2 and 3.
Sample 1 looks like a tempered martensite structure containing islands of ferrite.
I agree with the above. There is not enough information to determine if samples 1-3 should be used as strapping material.
RE: Help on microstructure identification
RE: Help on microstructure identification
Based on what you have described, however, I'd say you are looking at a plain carbon steel (~.4-.6 %C)that has been annealed and cold rolled. The differences in the microstructures reflect differences in the microstructures prior to cold rolling (which, perhaps, are adjusted by the supplier based on the amount of cold rolling and the desired tensile properties).
Just a WAG.
rp
RE: Help on microstructure identification
Nick
I love materials science!