×
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!
  • Students Click Here

*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.

Students Click Here

Jobs

Hidden Quench cracks
3

Hidden Quench cracks

Hidden Quench cracks

(OP)
Has anyone ever heard of a quench crack that cannot be seen by wet mag? I am new to my company, and it has been said that these cracks occur after quench and temper, but can only be found if the surface is ground.

RE: Hidden Quench cracks

it has been my experience if it is very fine sub surface cracks. but very very rare will not pick the indications, and it has more to do with the operators experience. NDT Inspectors., otherwise mag is very good. flo penetrant will pick up these types of cracks. it does not matter if it is ground or not. Mag will indicate cracks and/or indications if it is there.

RE: Hidden Quench cracks

It depends on surface condition, if the as HT surface is too rough (scale or texture) then it will be hard to find small indications. This is a signal to noise ratio issue.

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

RE: Hidden Quench cracks

The method of magnetization can influence how well sub surface defects are revealed.
https://app.aws.org/itrends/2005/04/025/

Seems I was reading a MIL spec fairly recently that said something similar

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