INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

How do you become a picture like this?

RE: How do you become a picture like this?

Is this a riddle?
What is the material?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: How do you become a picture like this?

Some type of stress corrosion cracking or hydrogen embrittlement.

RE: How do you become a picture like this?

(OP)
I formulated the question the wrong way. Sorry.
I meant that I also want to take such pictures for my samples.
I have a camera nikon d5200,
a picture with colors makes it difficult to identify a break.

Thank you

RE: How do you become a picture like this?

You take these with a microscope.
Many scopes have ways to mount regular cameras, you just need to set the camera to grey tone only.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: How do you become a picture like this?

(OP)
Thank you for your useful answers
I have searched for an answer for a long time
that saves my samples next week.
thank you

RE: How do you become a picture like this?

The usual process is to cut the section that you desire to look at.
Rough cut with a band saw.
Then the sample in mounted either in thermoset (Bakelite) or a resin.
The face of the mounted sample is them polished.
You wet grind/polish in steps starting at 180 grit and working through 0.05 micron.
Then you often etch to reveal details of the structure.
Metallography is a science unto itself

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: How do you become a picture like this?

Something I learned the hard way 54 years ago, Do it all by hand , do not be tempted to take a few passes on a surface grinder to speed things up.
You will end up with something that looks like a heat treated surface.
B.E.

You are judged not by what you know, but by what you can do.

RE: How do you become a picture like this?

The art of polishing using hand is dead. It is allautomption. Please recall Sir H.Morrogh who was a metallographer and polished several cast iron samples. One day while polishing he stumbled upon round graphite instead of flakes. His curiosity was aroused and thus BCIRA announced S.G Irons with spheroidal graphite.

Sorry for this digression I could not control myself. Thanks for your patience.

"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.

RE: How do you become a picture like this?

People send me mounted samples to look at, I take a couple of photos as they sent them and then re-polish by hand.
I know a machine system can do 12 samples in the time that it takes me to do 1, but mine come out clear and free from artifacts.
And I don't do many.
And don't get me started on lighting methods and etching. It also seams that using polarized light or DIC has become passe.
I have two reference books on color etching, but getting some of the chemicals has become difficult.
I recently had a chance to use a confocal microscope for some macro work (2x to 20x). The depth of field was great, similar to SEM but a lot easier and less expensive.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: How do you become a picture like this?

Capturing good quality photographs with a stereomicroscope can be difficult, especially when the surface is not flat (or worse, when it is flat and highly reflective).
You will be surprised what you can capture with a mid-range digital camera. The trick to taking macro pictures is to use minimum zoom, holding the lens close to the subject. The camera will tell you the minimum focal distance. The main tradeoff is distortion. If the area of interest is much smaller than the picture size, snap it at a high resolution setting and crop it using good editing software such as Gimp (it's open source).

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close