Hydrogen and austenite stabilization

✍ Scribed by E.G. Ramachandran; C. Dasarathy

• Book ID: 102617105
• Publisher: Elsevier Science
• Year: 1960
• Weight: 320 KB
• Volume: 8
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(60)90205-4

✦ Synopsis

Hydrogen and austenite stabilization* towards the austenitic strain embryos becomes more unlikely. Furthermore, the extent to which the steel, after normal austenitizing, is supersaturated with respect to hydrogen, is considerably smaller than with respect to carbon (about 3 or 4 : 1 as compared to 40 or 50 : 1) and hence the tendency for the hydrogen to come out of the body-centred iron lattice is itself quite small. Cohen et CL!.(~) first suggested in 1949 that the extent to which the '"strain embryos" of austenite were neutralized or deactivated, determined its stability and the extent to which it was retained during heat treatment. The strain embryos were considered to be centred round dislocations and/or other defects in the lattice and the deactivation to take place when carbon atoms, present interstitially in the austenite, migrated towards and were captured by the strain embryos. In an attempt to explain on the * Based on work carried out at Armour Research Foundation, Chicago, Ill., sponsored by the ARF Research and Invention Committee.