heat treatment product discoloration after of analysis

Four inspection steps and problem treatment for analysis of discoloration after heat treatment

Product discoloration is caused by problems existing in the process of heat treatment furnace and is one of the common problems in the whole heat treatment process. Today we will analyze and learn how to deal with and solve this problem together. The following is a case of gas heat treatment furnace to explain.

Step 1: Check whether the vacuum furnace equipment for heat treatment has leakage, and observe whether the pressure gauge index of the vacuum furnace is normal; Here we need to remind everyone a point, when the measurement of pressure rise rate must first preheat the furnace wall, and then cool to room temperature when the test, and can not open the furnace door and then vacuum for the test.

Step 2: check whether there is air intake pipe leakage, sometimes we tend to ignore the small accessories, but the vacuum furnace inlet pipe or the existence of the leak valve, the pressure inside the air intake duct is a gradient, the closer the furnace end is negative pressure, the more it is the leading cause of vacuum furnace processing out products one of the reasons for the wrong color.

Step three: Test whether the purity of the inert gas passing through the vacuum furnace is high or not. When the purity of the inert gas in the furnace is not enough, the oxygen mixed in the inert gas will lead to oxidation, decarburization and other behaviors of the product, and then cause the discoloration of the product. The purity of the gas can be measured directly or compared with other equipment and a conclusion can be drawn.

Step four: moisture, if the moisture content in the vacuum heat treatment furnace attached above the wall or profiles radiator heat exchanger of the vacuum furnace, so the humidity is not easy to discharge, by using the method of oven when vacuum furnace equipment if not mentioned three factors, processing the product color to change color, mostly because of the reasons that lead; We raise the temperature of the vacuum furnace equipment to high temperature, then stop heating, and then into the furnace into the high purity inert gas, and then start the fan circulation system, using the high temperature and hot air in the vacuum furnace to adhere to the vacuum furnace wall and heat exchanger on the top of the moisture out, only in this way can completely solve the problem.