lower-critical_temperature

Martensitic steel in its un-tempered hard form is much brittle for use. One of the methods to alleviate this difficulty is tempering. Tempering of quenched parts is required for majority of its applications. To get toughness tempering includes heating of steel at less than the lower-critical temperature, which is often 400-1105F or 205-595C as per […]

Proper treatment of heat requires precise-control over temperature, cooling rate and time at a particular temperature. Normally, heat treating process starts from heating alloys beyond upper transformation temperature. The exception to this is tempering, aging and stress relieving. This upper transformation temperature is known as “arrest” because at upper transformation temperature nothing noticeable happens. So, […]