Talk:Diffusion hardening

Synonym of case- hardening?
Case hardening was probably originally restricted to surface hardening with carbon into steel. Diffusion hardening clearly includes other processes including nitriding and boriding. I believe that the use of the term "case hardening" has now widened to include these other processes- if I'm right then it is an exact synonym for diffusion hardening. If that's the case then diffusion hardening can simply redirect to case hardening, which appears to be a better article. Any thoughts? Gravuritas (talk) 16:58, 26 September 2013 (UTC)