Steel Heat Treatment pdf

Steel Heat Treatment pdf - • • • • • Tempering...

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Unformatted text preview: • • • • • Tempering Annealing Stress Relieving Normalizing Quenching • Reheating a Hardened Material – Increases Ductility and Toughness • Three Components – Temperature – Time – Cooling Rate • Heating and holding a suitable temperature followed by an appropriate cooling rate. – Quenching has to occur – Produces desirable changes in the material properties or microstructure • Relieves stresses that remain locked in a structure as a consequence of a manufacturing sequence – Welding – Cutting with a torch – Machining • Both Thermal and Microstructure point of view – Thermal • Heating then cooled in still or slightly agitated air • Rapid cooling of steel from an elevated temperature – Typical Quenching techniques • • • Water Oil Air • What is the hardness required? – Refer to Heat Treater’s Guide • How Deep do You Need the Treatment? – Case – Through • What type of Heat Treatment is required? – Tempering, Annealing, Stress-Relief, Normalizing, Quenching • Turn On Furnace • Set To Appropriate Temperature – Determine from references • Place Metal In Furnace When Up to Temperature – Leave for determined time • Remove and Immediately Quench – Quench in appropriate fluid • Oil, Water, Air • Re-Set Furnace Temperature (Tempering) • Place Metal Back in Furnace (Tempering) – Leave for determined time • Remove and Cool at Designated Rate (Tempering) • Establish the type of steel that will be used • Determine the desired properties – Hardness • Case/Through • Choose the proper quenching technique • Metals Handbook Desk Edition, Second Edition. – JR Davis, Davis and Associates, 1998, ASM International • Steel Aluminum Stock List and Reference Book, Reference – Jorgensen Steel, Earle M. Jorgensen Co., 1998. (Section S.) ...
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