Effect of phosphorus on the yield strength at elevated temperature 3

[stanislasdz]

I would to know what is the effect of phosphorus on the yield strength at elevated temperature (300°C) in an austenitic stainless steels ?

Thanks in advance

 

[metengr]

http://www.springerlink.com/content/336u44842um41g66/

 

[stanislasdz]

Thanks Metengr

I just get this paper. Unfortunately I don't found what I need

Actually, i Have a 347 steel stainless steel grade with unexpected low values of yield strength at 280 °C

The only thing witch seems to be wrong is the value of the Phosphorus 0.030 % too high for me

So i want ton know what is the effect of the phosphorus on the yield strength at high temperatures

 

[metengr]

stanislasdz;
What are the room temperature mechanical properties? Is the ultimate tensile strength value acceptable at elevated temperature?

 

[stanislasdz]

Metengr

The ultimate tensile strength at elevated température is acceptable.

At room temperature

UTS : 580 MPa, YS : 260 MPa

 

[metengr]

stanislasdz;
One last question - is this a 347 casting or wrought material?

 

[stanislasdz]

Forging part

Thanks in advance Metenger

 

[metengr]

stanislasdz;
Having checked with several reputable technical references - "Handbook of Stainless Steels" by Peckner and Bernstein, followed by the "Physical Metallurgy Handbook" by Sinha, and "Stainless Steels for Design Engineers" by M. McGuire. The only information I could find was from Sinha's book, here is the quote;

In austenitic Cr-Ni steels, P addition can cause precipitation effects and increase the yield point.

. I would expect a similar trend for increased yield point for time independent tensile testing.

(I was able to find a technical paper regarding Nb-containing austenitic stainless steels that contained a similar statement regarding, P addition and the effects on precipitation kinetics. Sorry, but I forgot to bookmark it.)

The reason I inquired about the room temperature mechanical properties is to see if the YS was out of specification. Since it was acceptable, you may need to look elsewhere for the drop in yield strength. It could be that your tensile test results were in error for YS. It does happen.

I would run a duplicate tensile test at 450 deg C and run an additional tensile test at 500-550 deg C , and evaluate the results.

 

[metengr]

I would run a duplicate tensile test at 450 deg C and run an additional tensile test at 500-550 deg C , and evaluate the results.

Sorry, my mistake... the duplicate tensile test should be at 280 deg C, and the additional tensile test should be 400 deg C (if you have not performed this test already)

This is what happens when the mind suffers from entropy.

 

[arunmrao]

Star to you metengr for the extra mile that you go in helping. Always a great source of inspiration and knowledge to me.


If you think education is expensive, try Ignorance.
- Andy McIntyre


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[metengr]

arunmrao;
Thanks, Arun, your kind words are truly appreciated. I suppose having been an engineer for many years in a technical support role versus managing personnel I enjoy helping others with working a problem to completion or trying to understand the problem, and enabling someone else to go further to solve the problem.

 

[stanislasdz]

My GOD !

I never see that before. The member of this forum are Great guys

Metenger, your so generous thanks and Thousands of Thanks !