Heating rate effect 1

[ckiyak]

Is there any crucial effect of heating rate in solution or aging process for precipitation hardenable alloys ?

 

[metengr]

Not that I have seen or reviewed. Typically, heating and cooling rates are specified to avoid formation of harmful thermal stresses that can result in locally severe distortion and/or cracking.

 

[MagBen]

metengr made the point. If you material is hard (>35HRC) before Heat treatment, it is recommended to pre-heat to 1000-1200F, then heat to over 1300F to prevent damage (cracking, warpage etc.). If HT machined parts, especially for those with a big cross section area change, it is always a good practice to do a preheat.