Wednesday, March 9, 2011

[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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