Abstract
Purification of iron specimens to low levels of carbon and nitrogen by annealing in dry hydrogen below 1180 K was investigated. The magnetic after-effect and strain ageing were used for estimating the carbon and nitrogen contents. Decarburization of a few mm thick specimens was found to be controlled by both surface reactions and volume diffusion. The residual carbon content was found to depend not solely on the method of hydrogen purification but also on the type and state of the purification apparatus and on the annealing procedure. Carbon and nitrogen contents smaller than 1 at ppm were reproducibly obtained in a closed ZrH2 purification system which was baked at 500 K during annealing of specimens.
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Hejnal, T., Kadečková, S., Novák, V. et al. Purification of iron to low carbon and nitrogen contents by annealing. Czech J Phys 27, 1263–1275 (1977). https://doi.org/10.1007/BF01589021
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DOI: https://doi.org/10.1007/BF01589021