Mechanism for beneficial effect of boron addition on creep resistance of 9-12% chromium steels
Paper in proceedings, 2006

Energy filtered transmission electron microscopy has been used to study two similar steels after long time aging, with different boron additions, to measure the effect of B on coarsening rate of M23Ce precipitates. The mechanism behind the effect of boron could either be a drastic decrease in the energy of the interface between M23C6 and matrix or a decrease in flux of atoms from a shrinking precipitate to a growing one. We suggest that the latter mechanism is operating, based on atom probe (APFIM) measurements of boron solubility in the matrix and the detection of Mo-B clustering.


Ardeshir Golpayegani

Chalmers, Applied Physics, Microscopy and Microanalysis

Hans-Olof Andrén

Chalmers, Applied Physics, Microscopy and Microanalysis

International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005; Phoenix, AZ; United States; 29 May 2005 through 3 June 2005

Vol. 1 461-466

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Other Materials Engineering

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