×
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

A-286 Test for Over/Under Aged

A-286 Test for Over/Under Aged

A-286 Test for Over/Under Aged

(OP)
I have a large number of small parts machined from A-286.  After machining, a few of the parts were found to be harder or softer than recommended specification, believed to be due to improper age hardening treatment.  We need a quick way to sort the defective from the acceptable parts.  Unfortunately, hardness testing is considered destructive on this part.  Any suggestions?

RE: A-286 Test for Over/Under Aged

TEV, Are you sure hardness variation comes from improper age heat treat ? Hardness variation would be difficult to see if all the parts were aged together, since A-286 is fairly forgiving during age (small temp. variations within load will not produce different hardness). After machining however (since A-286 has a very sensitive response to cold work) change of cutting tool during the machining operation can make superficial hardness change considerably. To monitor this, we generally use microhardness (Vickers or Knoop scale) as suggested by GRoberts with 100 gm or 200gm application force.
    

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