×
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

Reduction of Tensile Strength with PWHT
3

Reduction of Tensile Strength with PWHT

Reduction of Tensile Strength with PWHT

(OP)
I am in need of some data for predicting the reduction of tensile strength in 2.5" thick SA516-70 normalized at varying PWHT times.  I have read on some threads about the Hollomon-Jaffee Parameter, but I haven't had any experience with this equation.  Can someone help me out?

RE: Reduction of Tensile Strength with PWHT

Until somebody comes along that can better understand your question, in a pinch you might take a look at the strength vs. draw temps charts for AISI 1030 which is ~close to your SA516 in Bethlehem Steel "Modern Steels" book.  This won't answer your "time at temp" question, but you could also look at the ASM "Atlas of I-T and C-T Diagrams" or other references mentioned by Corypad in thread#330-198668. These charts will give you hardness information that may get you whatever you're looking for.  There is some other excellent links in that thread as well.

RE: Reduction of Tensile Strength with PWHT

Hi Met-
I knew you would be along soon enough. That second .PDF is great. But on page 2, it refers to a "Plate Steel Specification Guide" with a link that doesn't go anywhere.   If you get in to www.mittalsteel.com or the ArcelorMittal website there isn't any way to get Mittal technical publications.  Can you help us find that Guide?

RE: Reduction of Tensile Strength with PWHT

(OP)
Thank you all for the good responses to my question.  Mittal has some great literature for answering my question; however, I would like to find a more detailed answer regarding the mechanism for reduction in tensile strength with increased PWHT time.  Am I safe to assume that the normalized microstructure gets tempered over time and loses some of its strength?  Also, why does Mittal use Larson-Miller Parameter in their data?  I thought this equation was for material that ruptures under a constant stress at a given temperature.  Would it be better to use the Holloman-Jaffe Parameter?  

RE: Reduction of Tensile Strength with PWHT

Quote:

Am I safe to assume that the normalized microstructure gets tempered over time and loses some of its strength?

Reply; Yes

Quote:

Also, why does Mittal use Larson-Miller Parameter in their data?

The time/temperature effects on tempering can be described using either LM for strength or HJ for hardness because these parametric equations provide the best correlation to plotted data.

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