×
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

Problems in ageing heat treatment

Problems in ageing heat treatment

Problems in ageing heat treatment

(OP)
I work for a company, often producing parts out of maraging steel and 13-8PH stainless steel. Unfortunately our heat treatment sub contractor are having a few power problems at the moment and there has been a couple of incidences of power loss during ageing of the above material part way through the process (after between 50% and 75% of the specified time).
Despite hardness tests suggesting they are within the post treatment specification I have directed the heat treaters to make up the aging time in a second step; the reason being while hardness looks fine, this do not give good information on mechanical properties.
Would any of you make a different decision?   

RE: Problems in ageing heat treatment

For me to decide what I would do, I would need to know what specifications were applicable, what the size of the parts were, what were the actual furnace times, and maybe a bunch of other information.  My gut reaction would be to re-run the complete (full time) aging cycle, but I would need to know much more information to make a decision.

rp

RE: Problems in ageing heat treatment

We heat treat 17-4 bar to the H1100 condition.  There have been times when the chart recorder is not turned on.  When this happens, I have them rerun the parts for the full four hours.  I ran the mechanicals for one four hour cycle and compared them to parts ran for two four hour cycles.  Tensile and yield were reduced by less than 4%, while elongation and reduction in area were unaffected.

grayseal

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