Heat Transfer Coefficients
WSpQ has proven to be an effective method for intensive quenching. This process offers heat transfer coefficients (HTC) of up to 4,000 W/(m²K), which is significantly higher than those attained with conventional oil quenching methods (1,500–2,500 W/(m²K)).
Furthermore, compared to oil quenching, WSpQ eliminates the Leidenfrost effect, ensuring that the high HTC remains constant throughout the complete quenching process.
The combination of WSpQ with single-layer heat treatment enables, for the first time, the successful application of WSpQ to the treatment of complex-shaped components. This approach offers several advantages:
Potential material substitution: to enable the use of less alloyed steel grades, leading to cost reduction.
Improved quality after quenching: by enhancing the mechanical properties of the treated parts, including:
increased strength,
higher Martensite content,
increased residual compressive stresses on the surface of the treated components.
Additionally, the process provides the options for:
Tailored quench intensity: adjustable cooling rates to tailor the quench intensity for each specific part-geometry and for each specific hardenability of the steel grade.
Dynamic quenching capability: the ability to vary quench intensity throughout the process, such as maintaining a specific temperature level during the quenching-process.
WSpQ is primarily suitable for single-layer (or at most double-layer) treatments, as well as for the treatment of large individual components. Bulk load treatment is possible when arranged in a single-layer configuration.
In future investigations, the distortion of components after WSpQ will be examined, along with their fatigue resistance and residual compressive stresses after heat treatment.
The next stages of development will focus on developing and designing a WSpQ chamber compatible with the SyncroTherm furnace, featuring full batch capacity and an automated transfer from the furnace to the quenching unit.
Further testing will be conducted on the following:
bulk loads,
individual large components,
additional materials, including low-alloy steels, free-cutting steels, and potentially titanium.
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