Age Strengthening of Gray Cast Iron
Statistically significant; room temperature, age strengthening has been observed in 23 of 25 separate studies conducted in ten different foundries. The increase in strength ranged from 3.3% to a high of 13.5%. The strength increase is time and temperature dependent and thus can be accelerated by holding test bars at temperatures in the range of 85°C to 285°C prior to testing. Initial tests indicate that the aging process can be reversed by resolutionizing and water quenching from 704°C. Nitrogen present in excess of stoichiometry with strong nitride formers seems to be a factor.
V. Richards et al., "Age Strengthening of Gray Cast Iron," International Journal of Cast Metals Research, Maney Publishing, Jan 2003.
Materials Science and Engineering
Keywords and Phrases
Age Strengthening; Artificial Aging; Gray Cast Iron; Nitrogen
Article - Journal
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