At what temperature and duration is age hardening typically performed?

Show Answers

Heating between 200 and 450°C for 15 to 30 minutes followed by water quenchingHeating at 700°C for 10 to 15 minutes and then quenching in waterHeating at 700°C for one hour followed by water quenchingHeating above 700°C for 30 minutes and quenching in water

Explanation

Age hardening is carried out by heating the material to a moderate temperature range of 200 to 450°C for 15 to 30 minutes, then rapidly cooling it in water. This process enhances strength by precipitating fine particles within the metal structure. Higher temperatures like 700°C or above are not typically used for age hardening as they can lead to over-aging or loss of desired properties.