Discussion of the Problem on Designing the Global Database for Different Kinds of Quenchants

摘要

To make computer simulation for heat treating industry possible, engineers need a database for cooling capacity of different kinds of quenchants. Unfortunately, there is no such database available for engineers and computer programmers yet. As a rule, investigators use standard Inconel 600 probe or silver probe with one thermocouple at the core to measure cooling capacity of quenchants. It is shown that Inconel 600 probe can provide average effective heat transfer coefficients. Silver probes can be used to measure the heat transfer coefficients during full film boiling and to measure critical heat flux densities. It is shown that critical heat flux densities must be measured to predict heat transfer modes during quenching and optimize the process of cooling. It is stated that heat transfer coefficients should be calculated on the basis of solving inverse problem based on testing real steel parts with thermocouples near the surface. The possibility of use the first kind of boundary condition in the paper is widely discussed. Such approach simplifies significantly calculations and can be combined with the third kind of boundary condition.