The process of quenching an austenitized ferrous alloy in a medium at a temperature in the upper portion of the tempera?ture range of martensite formation, or slightly above that range, and holding in the medium until the temperature throughout the alloy is substantially uniform. The alloy is then allowed to cook in air through the temperature range of martensite formation
A heat treatment involving austenitization followed by step quenching, at a rate fast enough to avoid the formation of ferrite, pearlite or bainite to a temperature slightly above the Ms point. Soaking must be long enough to avoid the formation of bainite. The advantage of martempering is the reduction of thermal stresses compared to normal quenching. This prevents cracking and minimizes distortion.
A hardening treatment of a steel involving a slow cool through the martensitic transformation range to reduce stresses associated with the quenching of austenite. An important aspect of martempering is that no transformation product other than martensite should form. See Austenite, Martensite, Quenching.
Quenching an austenitized ferrous alloy in a medium at a temperature in the upper part of the martensite range, or slightly above that range, and holding it in the medium until the temperature throughout the alloy is substantially uniform. The alloy is then allowed to cool in air through the martensite range. (2) A hardening procedure in which an austenitized ferrous material is quenched into an appropriate medium at a temperature just above the Ms temperature of the material, held in the medium until the temperature is uniform through-out -but not long enough for bainite to form - and then cooled in air. The treatment is frequently followed by tempering. (3) When the process is applied to carburized material, the controlling Ms temperature is that of the case. This variation of the process is frequently called marquenching.
A heat transformation procedure in which an austenitised steel is quenched to a temperature just above MS, the martensite start temperature, at a rate fast enough to avoid the formation of ferrite, pearlite or bainite. The steel is then held at this temperature for long enough to achieve temperature uniformity without transformation and then cooled to room temperature. The process is employed to minimise the chance of quench cracking or distortion occurring.