Knowing the differences between a dip and a continuous quench is important. During a quench process, the heat increases, the temperature decreases, and the uniform metallurgical microstructure is achieved. The mechanical properties are also uniform.
Distinguish between continuous quench and dip quench
Identifying whether a continuous or dip quench plate is better for your production can be challenging. Many factors affect the final results. However, Paulo metallurgists can help you understand the trade-offs between each method.
The major difference between a continuous and dip quench is the degree of uniformity achieved. In both systems, the temperature of the surface is used to preserve the flatness of the plate. This is because hot liquids tend to sink while cooler liquids tend to rise.
A roller spray quench is an alternative to a continuous quench but has shortcomings. The primary problem is that the orifices of the spray pipes block, causing the plates to be quenched out of the flat. This leads to failures to meet mechanical properties.
Increase heat flux
Various quench plates increase heat flux and materials' mechanical properties. The most important factor influencing the quenching rate is the water velocity. This study investigated the water velocity for several different water qualities. Then, a two-dimensional model of a quenched probe was developed and used to assess heat flux transients. This experimental technique applies to both metal and liquid interfaces.
A sample to be quenched was shaped as a circular disc. Temperatures of the water film on the metal surface were measured. This was then used as input to a mathematical model. The results indicate that the temperature of the water film on the metal surface rises as the cooling progresses. The heat-transfer coefficient also increases with the surface temperature.
Sharp temperature decrease
Increasing the surface speed of a plate during quenching results in a significant decrease in the thermal boundary layer thickness and, therefore, the rate of boiling. To quantify this effect, a new experimental setup was developed. The device was based on a linear unit that moved the plate through a water jet at a predetermined speed. The apparatus was also fitted with a high-speed camera to provide a detailed visual representation of the surface.
The water jet temperature was also studied. The increase in temperature from 25 C to 60 C resulted in an explosive boiling of the water film adjacent to the plate surface. It was hypothesized that this would lead to a lower surface heat flux and a stable vapor layer formation. The results showed that this hypothesis was true.
Uniform metallurgical microstructures and mechanical properties
During heat treatment, different metallurgical microstructures are produced in the quench plates. The effect of quenching and cooling rate on the microstructure's morphology and the quench plate's mechanical properties is discussed. In addition, the interrelationship between the hardenability and processing conditions of the steel sheet is investigated.
The QP process is an effective method of producing a ductile and comprehensive microstructure in steel. In the QP process, carbon is partitioned from the matrix to neighboring untransformed austenite. The result is a comparatively high percentage of carbon-enriched RA. In the original Q&P treatment, carbon partitioning occurs isothermally. However, additional mechanical treatments can reduce the amount of microsegregation.
The TSQ&P specimens showed similar impact energy trends and transition curves as the HDQ&P1 and HDQ&P2 specimens. The impact energy and J25 values were correlated with the size of the martensitic crystals.
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