Volume 8, Issue 4 (April 2011)
Analysis and Prevention of Quenching Failures and Proper Selection of Quenching Media: An Overview
Quenching is an essential part of the thermal process used for the manufacture of metallic parts. Quenching involves rapid cooling of a metal from an austenitizing temperature to a lower temperature; usually, but not necessarily, room temperature. The quenching process is typically accompanied by thermal and transformational stresses, which are the main causes for most quenching failures. Any failures or defects during the quenching process result in excessive waste and an often unacceptable increase in the overall production cost. Prevention and elimination of quenching failures are of great significance especially with respect to the rational utilization of energy and resources and the reduction of carbon emissions. Therefore, the quenching method and quenching medium are among the most important factors to be considered in the design of the manufacturing process. The objective of this paper is to discuss quenching failures and to analyze their causes. Counter-measures for prevention of quenching failures and a new criterion for quenchant selection are also suggested.