The partitioning of alloying elements in vacuum arc remelted,Pd-modified PH 13-8 Mo alloys |
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| Authors: | M J Cieslak J A Vandenavyle M J Carr C R Hills R E Semarge |
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| Affiliation: | (1) Process Metallurgy Division, Sandia National Laboratories, 87185 Albuquerque, NM;(2) Mechanical Metallurgy Division, Sandia National Laboratories, 87185 Albuquerque, NM;(3) Electron Optics and X-Ray Analysis Division, Sandia National Laboratories, 87185 Albuquerque, NM |
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| Abstract: | The partitioning of alloying elements in as-solidified PH 13-8 Mo stainless steel containing up to 1.02 wt pct Pd has been
investigated. The as-solidified structure is composed of two major phases, martensite and ferrite. Electron probe microanalysis
reveals that Mo, Cr, and Al partition to the ferrite phase while Fe, Ni, Mn, and Pd partition to the martensite (prior austenite)
during solidification and cooling from the solidus. In addition to bulk segregation between phases, precipitation of the intermetallic,
PdAI, in the retained ferrite is observed. Precipitation of the normal hardening phase, β-NiAl, is also observed in the retained
ferrite. Partition ratios of the various alloying elements are determined and are compared with those observed previously
in duplex Fe-Cr-Ni stainless steel solidification structures. The martensite start temperature (Ms) was observed to decrease with increasing Pd concentration. |
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