Nucleation of intragranular ferrite in Fe-Ni-P alloys

Details Nucleation of intragranular ferrite in Fe-Ni-P alloys Nucleation of intragranular ferrite in Fe-Ni-P alloys

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mta....15..861n&link_type=abstract

Metallurgical Transactions A, Volume 15, Issue 5, pp.861-865

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The nucleation of intragranular ferrite from austenite in Fe-Ni-P alloys was investigated in order to understand the development of the Widmanstätten pattern in iron meteorites. Alloys containing 5 to 10 wt pct Ni and 0 to 1 wt pct P were used to simulate iron meteorite compositions. In the isothermal and controlled cooling experiments the reaction path γ → α + γ serves only to nucleate ferrite along austenite grain boundaries. It is necessary for (FeNi)3P to be present within y grains in order to nucleate intragranular ferrite. The reaction path γ → γ + phosphide → α + γ + phosphide yields rod shaped ferrite nuclei that bear a near Kurdjumov-Sachs orientation relationship with the surrounding matrix. The precipitation of ferrite, both along grain boundaries and within the austenite grains, is suppressed in the absence of P.

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