A tube furnace negative pressure gas quenching device

Abstract

The invention relates to a tube furnace negative pressure gas quenching device, which belongs to the technical field of metal heat treatment. The device consists of a stainless steel flange, a bottom bracket, an air inlet pipe and an air outlet pipe. The bottom bracket is fixed on the stainless steel flange, and a sample table is arranged on the surface. The air inlet pipe and the air outlet pipe are symmetrically distributed on both sides of the sample table; the heat treatment process The middle sample is placed on the sample stage, which is at the same height as the inlet pipe and the outlet pipe. Negative pressure is maintained in the furnace tube throughout the experiment, and the cooling intensity can be adjusted to meet the experimental requirements of different materials and different heat treatment processes by adjusting the argon flow of the intake pipe during gas quenching. The negative pressure gas quenching method adopted in the present invention has no oxidation risk in the whole process, the operation process is simple and fast, and the cooling efficiency of negative pressure gas quenching is much higher than other cooling methods; at the same time, the device provided by the present invention is easy to refit and maintain, and can be applied to different Model / diameter tube furnace, no need to make additional modifications to the equipment, greatly improving the experimental efficiency and operability.

Description

Technical field: [0001] The invention relates to the technical field of metal heat treatment, in particular to a tube furnace negative pressure gas quenching device. Background technique: [0002] Quenching is one of the most widely used process methods in the steel heat treatment process. By heating the steel to Ac 3 (hypoeutectoid steel) or Ac 1 (Hypereutectoid steel) above the temperature, and then cooled at a strength greater than the critical cooling rate, so as to obtain a room temperature structure dominated by martensite. However, the existing tube furnaces often use quartz or corundum as the material of the furnace tube, which has poor thermal shock resistance and cannot quickly cool down the furnace tube. When using the traditional liquid quenching method to achieve high-temperature quenching of the sample, the sample needs to be taken out of the high-temperature furnace for quenching treatment. While there are potential safety hazards, the surface of the sample ...

AI Technical Summary

Problems solved by technology

However, the annealing furnace involved in this patent has many disadvantages: 1. The furnace body of the annealing furnace is not provided with a gas outlet, and the air pressure inside the furnace tube may exceed the limit of the sealing device during ventilation and cooling, causing safety accidents; 2. When the cooling gas flow rate is large At the same time, the gas jet formed along the direction of the gas nozzle may cause the local cooling rate of the furnace tube to exceed the tolerance limit, resulting in the breakage of the furnace tube; 3. Most of the current tube furnace tubes do not have an air intake channel reserved, and the transformation cost is too high

Images