Abstract
Auger electron spectroscopy was employed to directly determine the cause of thermal embrittlement of 250 series maraging steel. A drop in CVN energy with introduction of an embrittling intermediate anneal was directly correlated with a build-up of both Ti and C on the prior austenite grain boundaries. By following grain boundary concentration of Ti as a function of time at a given temperature, the diffusion coefficient for Ti in the maraging steel at 1600°F was determined. Finally, the further drastic drop in CVN energy on aging an embrittled specimen was shown to be due to a segregation of B to the already embrittled prior austenite grain boundaries, causing a further loss of cohesion.
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Formarly with Michigan Technological University, Houghton, Mich.
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Johnson, W.C., Stein, D.F. A study of grain boundary segregants in thermally embrittled maraging steel. Metall Trans 5, 549–554 (1974). https://doi.org/10.1007/BF02644648
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DOI: https://doi.org/10.1007/BF02644648