A study of grain boundary segregants in thermally embrittled maraging steel

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Department of Materials Science and Engineering


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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© 1974 American Society for Metals, The Melallurgical Society of AIME. Publisher’s version of record: https://doi.org/10.1007/BF02644648

Publication Title

Metallurgical Transactions