The distribution of palladium in a Pd-modified 4130 steel |
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Authors: | M. K. Miller S. S. Brenner M. G. Burke |
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Affiliation: | (1) Metals and Ceramics Division, Oak Ridge National Laboratory, 37831 Oak Ridge, TN;(2) Department of Materials Science and Engineering, University of Pittsburgh, 15261 Pittsburgh, PA |
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Abstract: | The addition of palladium to a 4130 steel reduces its sensitivity to stress corrosion cracking and to hydrogen-induced cracking. The atom probe field-ion microscope has been used to study the microstructure and microchemistry of these palladium-modified 4130 steels with particular emphasis on the distribution of palladium between the various phases and internal interfaces. The palladium was found to segregate to the ferrite-ferrite lath boundaries to form a mono-atomically thick adsorbate layer. Palladium-manganese precipitates both at the lath boundaries and in the ferrite matrix were also detected. Most of the palladium was found to remain in solution in the ferrite. |
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