×
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

Delayed Stress Releiving / Normalising

Delayed Stress Releiving / Normalising

Delayed Stress Releiving / Normalising

(OP)
Identically Deep drawn and welded cups, made from hot rolled steel sheets of same cast are divided into two equal lots. One lot is stress relieved or normalised immediately and the other say after a year. Would there be a difference in the micro-grain structure of the parent metal of the two lots? If yes, the reasons for the same may please be intimated. Further is there any defined relationship between the difference and such time delay.

RE: Delayed Stress Releiving / Normalising

Response to stress relief may minutely differ because of the minor amount of room temperature creep that could occur over a year, but normalizing is really a history-erasing process in which new austenite grains are formed from which new ferrite grains are precipitated. There is nothing in a time delay to alter the driving forces which determine grain size of the final material in the two lots.
  That said, being from the same cast does not make two lots identical; their chemistries can differ, but more importantly their processing paths could have differed greatly. For example, hot reduction, hot rolling temperature, cold reduction and annealing temperatures; all these can influence the as-drawn part you have some issue with.
   There is a lot of variability in steel that does not derive from chemistry. That is the most controllable variable.
  Tell us the issue and let us deal with specifics.

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