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17-4 PH

17-4 PH

(OP)
Please explain the significance of the weight percent ratio of noibium to carbon being less than 6.

Nb/C < 6

Thanks.

RE: 17-4 PH

This is due to C-Nb-P interactions which lead to phosphorus segregation at grain boundaries, reducing material toughness.  High toughness and strength are retained when Nb/C < 6.

You can learn more from the article "Effect of phosphorus segregation on impact toughness variation in 17-4 precipitation hardened stainless steel", Scripta Metallurgica Volume 20, Issue 5 (1986), pages 713-716, available from ScienceDirect:

http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2312963%231986%23999799994%23432293%23FLP%23&amp;_cdi=12963&_pubType=J&amp;view=c&amp;_auth=y&_acct=C000050221&_version=1&;_urlVersion=0&_userid=10&amp;md5=44fa4a5d508ee024b4e005f8213c5c86

Regards,

Cory

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