By Dan Jones
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The alloys are qualified based on their HTPQ rankings, not on the average scores calculated and presented. 0 Ease of Quenching Ranking for HTPQ A A A B B B B B B B C C B B C B A Score: larger numbers indicate alloys that are easier to quench/solutionize Rankings: A is easiest to quench or solutionize, D is most difficult to quench/solutionize These semi-quantitative ease of heat treatment ranking combined with HTPQ section size information can be used to determine pre-qualified heat treatments for high alloys steels.
2 Comparison of Tempering Models Table XXII summarizes the capabilities of the various tempering models reported in the literature. Though finite difference methods [BROO1996] have the ability to incorporate rampup times, their drawback is that they predict properties based on activation energies, which are known for only certain grades of steel. Totten, et al. [TOTT1977] consider only tempering temperature and as-quenched hardness and therefore may not be useful for predicting final properties for many other heat treatment types used by steel foundries.
Most steel foundries use temperature-controlled, agitated water quench tanks to ensure adequate quenching of casting loads. Agitation helps to interrupt the vapor blanket that forms in the first stages of cooling. Large, complex casting shapes and large quench tank loads can stretch the limit of quench tanks to provide adequate quench severity during quenching. Careful control of water quench tank temperature and agitation is necessary to control quench severity. According to the Handbook of Quenchants and Quenchant Technology [TOTT1993]: “Quench severity, as measured by cooling curve analysis, is dependent on linear flow rate, turbulence, quenchant temperature, both interfacial and bulk solution viscosity, uniform surface wetting, and direction of fluid flow impinging on the hot metal surface.