A useful discussion on AISI-1045 Carbon Steel Heet Treatment Problem... ReversEngineering Consultants wrote: "three more things, i need to know (i) furnace type (ii) what kind of manufacturing value addition has been done (iii) the raw material cross-section from which part is being machined....Also, please, provide me the part details (cross-section shape, wall thickness, air cooling procedure), kind of part holding fixture; i hope you are using correct soaking times in the furnace..." ReversEngineering Consultants wrote: "Dear, if always parts develop hardness greater than what is defined for AISI-1045 Carbon Steel at Normalized temper and your rest of the parameter/ factors (material conformance, furnace calibration, parts loading temperatures and critical temperature setpoint etc) then it means your parts are experiencing some kind of Quenching phemomenon..." ReversEngineering Consultants wrote: "after analyzing your inputs, (i) you need to change your part holding fixture (the stainless steel tray) as in this case it seems acting like heat sink; the tray must be of 1 to 2 mm of thickness and with quite large area as compared to your parts, so once you take out your parts in open air, the tray gets rapidly cooled and subsequently your parts dissipates heat to the tray and so on, hence your parts are experiencing rapid cooling during aircooling; you can use some ceramic fixture or something appropriate n donot put the parts in open air put them may be in some nearby oven or furnace at room temp.... (most likely in your problem) (ii)the parts you are heat treating are having wall thickness less than critical thickness so you need to soak them towards lower limits of critical temperature and can do iteration with slightly lower temperatures to normalize them..."
Posted on: Sun, 18 Aug 2013 07:02:06 +0000
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