Heating cracks of aluminum alloy aging furnace

Heating cracks of aluminum alloy aging furnace

When heating large steel ingots with large cross-sectional dimensions and high-alloy steel and high-temperature alloy billets with poor thermal conductivity, if the heating speed is too fast in the low temperature stage, the billet will generate large thermal stress due to the large temperature difference between the inside and the outside. In addition, the blank has poor plasticity due to the low temperature at this time. If the value of the thermal stress exceeds the strength limit of the blank, heating cracks radiating from the center to the periphery will occur, causing the entire section to crack.

The downstream supporting units involved in the box heat treatment furnace are mainly concentrated in:

Colleges, laboratories, research institutes, laboratories, industrial production and other fields. Box-type heat treatment furnaces are used in many applications, such as: glass firing, and can also be used for heat treatment and heating of general small steel parts such as quenching, annealing, and tempering. Of course, box-type resistance furnaces can also be used as metals, ceramics, For high heat such as dissolution and analysis.

Aluminum alloy aging furnace overheated

Overheating refers to the phenomenon that the heating temperature of the metal blank is too high, or the residence time is too long within the specified forging and heat treatment temperature range, or the temperature rise is too high due to the thermal effect.

Carbon steel (hypoeutectoid or hypereutectoid steel) often appears Widmanstatten structure after overheating. After the martensitic steel is overheated, the intragranular texture often appears, and the tool and die steel is often characterized by the primary carbide hornization to determine the overheated structure. After the titanium alloy is overheated, obvious β-phase grain boundaries and a straight and slender Widmanstatten structure appear. After the alloy steel is overheated, there will be a stone-shaped fracture or a strip-shaped fracture. The overheated structure, due to the coarse grains, will cause the mechanical properties to decrease, especially the impact toughness.

After normal heat treatment (normalizing, quenching) of structural steel that is generally overheated, the structure can be improved and the performance will be restored. This kind of overheating is often called unstable overheating; while the severe overheating of alloy structural steel is normalized (Including high temperature normalizing), annealing or quenching treatment, the overheated structure can not be completely eliminated, this kind of overheating is often called stable overheating.

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