52100 ductility 1

[Steve898]

What is the ductility of 52100 tempered (after quenching) at various temperatures? I am looking for a published chart if possible. Also, would marquenching vs oil quenching have an impact on ductility?

 

[NickE]

That all depends on your quench medium and tempering temp and time. for shorter tempering times and lower temps ductility after heat treat will be lower. (IE: Ductility varies inversly as hardness.)

marquenching and regular quenching are different heat treat processes designed to do different things to the structure.

I Think MIL-HDBK-5J covers heat treat and physical properties of steels. Search this fourm for a link to where to get it (70MB download).

 

[Steve898]

Thank you for the info.
Are you sure this mil-spec will have the elongation of 52100 tempered at 300F,400F,500F,600F,700F,800F,900F,1000F?
52100 is not usually considered for use in aerospace applications except as bearings with hardness over 60 HRC.
Heat Treater's Guide and Vol 4 contain ductility/elongation data on steels like 4140 and 4340, but not 52100. Since the m/s is carbide in tempered martensite, how is ductility affected? Is there a sudden increase when tempered at 700-750F?

 

[NickE]

I dont know, no I'm not sure, you are going to have to do your web research yourself. You might want to try timken's site or the Carpentertechnology site. Other well established producers of this steel should have done tensile tests at differing hardness levels to determine %elong vs temper temp (At constant time).



Nick
I love materials science!

 

[unclesyd]

The only information of this type that I’ve seen was a private communication from one the bearing companies to a colleague about 15 years ago. I checked with him and all his technical papers were left on site when he retired and all is lost as any correspondence over three years old is consider obsolete information.

Here is a reference to a paper on 52100. The only problem is that is isn’t available from Storming Media. You might contact the Naval Post Graduate School Library or the Linda Hall library.

http://www.stormingmedia.us/52/5214/A521401.html

 

[israelkk]

MIL-S-7420 available at

http://assist.daps.dla.mil/docimages/0000/18/44/6462.PD7

Allows only heat treatment to 63RC minimum.

 

[TVP]

I agree with unclesyd-- try to find that Naval report or contact a steel company that makes this alloy. Wire producers include Shinsho American, Johnstown Wire, Bekaert, and ECD. Steel mills include Timken and Ovako.

 

[RPstress]

There's a chart of RA and e vs. tempering temperature in the ASMH (which is worth having if you can afford it: see Purdue University). If you give me an e-mai address I could maybe send the picture.