Surface hardening of Fe−Ti alloys by nitriding is best with a titanium content not exceeding 1.3–1.5%. This produces a case with a high microhardness and good adhesion to the base metal. In alloys with a higher titanium content the amount of nitrogen dissolved in nitriding results in a sharp increase of the volume, embrittling the case and causing cracks.
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Belotskii, A.V., Dukhota, P.V. & Permyakov, V.G. Phase and structural changes in nitriding of iron alloyed with titanium. Met Sci Heat Treat 13, 659–661 (1971). https://doi.org/10.1007/BF00651785
- Structural Change
- Base Metal