×
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

Identification of quench cracks at tooth root

Identification of quench cracks at tooth root

Identification of quench cracks at tooth root

(OP)
I have a small gear, 26 DP / 46 teeth, fabricated from 8620. A recent gear tooth failure problem was potentially linked to the existance of quench cracks. I question the observation only on the basis that only a single tooth was found to be cracked. Seeing as the entire gear would be submitted to the same heat treatment wouldn't I expect other teeth to exhibit the quench cracks? Comments?

BCK

RE: Identification of quench cracks at tooth root

Not necessarily.  Remember that manufacturing and heat treating processes are dynamic in nature, with local variables in addition to global variables.  Retained austenite, residual stress, surface defects, etc. are not constants, so it is possible for a gear to have only one quench crack.  Quench cracks are usually easy to diagnose, due to the light oxide scale that develops during tempering.

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