[MW:10241] RE: 10237] FW: 10221] Effect of phosphorus as an alloying element on microstructure and mechanical properties of pearlitic gray cast iron

Dear Pradip,

 

Thank you very much for this information it is indeed very interesting information. The reason why I’m looking for such info is that a client of me is facing problems with casted bushes from which they machine Piston Rings. Hardness of the material is sometimes to low and there are inclusions present in the casting which first show up during machining. This kind of problems are mentioned in these documents and could be helpful finding the underlying problem.

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens pgoswami
Verzonden: woensdag 9 maart 2011 14:32
Aan: materials-welding@googlegroups.com
Onderwerp: [MW:10237] FW: 10221] Effect of phosphorus as an alloying element on microstructure and mechanical properties of pearlitic gray cast iron

 

Hi Herman,

The attached literatures would be of interest to you. The issue looks to be formation  the formation  low melting  but hard eutectic called stedite. Phosphorus is good for fluidity  and hard phosphides/stedites increases the wear resistance of  grey iron castings. However it's always  advisable to restrict phosphorus within the specified limits, otherwise excess phosphides would make CI very brittle.

This effect would be less pronounced in S.G iron, where the impurities are inoculated and rounded up through injection of magnesium.

Thanks.


Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of hpi001
Sent: Tuesday, March 08, 2011 8:55 AM
To: Materials & Welding
Subject: [MW:10221] Effect of phosphorus as an alloying element on microstructure and mechanical properties of pearlitic gray cast iron

Does anyone within this group has experience and/or some documentation which shows the effects of adding phosphor to pearlitic Gray Cast Iron, and what the reason is for such addition?

Thank you in advance.

Best Regards,

Herman Pieper

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