Effect of composition on the solidification behavior of several Ni-Cr-Mo and Fe-Ni-Cr-Mo alloys |
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| Authors: | M J Perricone J N Dupont |
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| Affiliation: | (1) Department of Materials Science and Engineering, Lehigh University, USA;(2) Joining and Coatings Division, Sandia National Laboratories, Albuquerque, 87185, NM;(3) Present address: Department of Materials Science and Engineering, Lehigh University, 18015 Bethlehem, PA |
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| Abstract: | The microstructural development of several Ni-Cr-Mo and Fe-Ni-Cr-Mo alloys over a range of conditions has been examined. A
commercial alloy, AL-6XN, was chosen for analysis along with three experimental compositions to isolate the contribution of
individual alloying elements to the overall microstructural development. Detailed microstructural characterization on each
alloy demonstrated that the observed solidification reaction sequences were primarily dependent on the segregation behavior
of molybdenum (Mo), which was unaffected by the large difference in cooling rate between differential thermal analysis (DTA)
samples and welded specimens. This explains the invariance of the amount of eutectic constituent observed in the microstructure
in the welded and DTA conditions. Multicomponent liquidus projections developed using the CALPHAD approach were combined with
solidification path calculations as a first step to understanding the observed solidification reaction sequences. Discrepancies
between the calculations and observed reaction sequences were resolved by proposing slight modifications to the calculated
multicomponent liquidus projections. |
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