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Reduction of Tensile Strength with PWHT 3

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Montana1

Materials
Jun 24, 2005
17
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?
 
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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.
 
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 or the ArcelorMittal website there isn't any way to get Mittal technical publications. Can you help us find that Guide?
 
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?
 
Am I safe to assume that the normalized microstructure gets tempered over time and loses some of its strength?

Reply; Yes

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.
 
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