Heat treatment equipment and precautions titanium plate

On the principle of titanium and titanium alloy heating equipment , iron and steel used in heating oil furnace , induction furnace , gas furnace, electric furnace ( including carbon silicon rods, resistance wire heating chamber furnace , pit furnace ) , electric heating and oil heating the roller furnace and bath heaters , etc. can be heated titanium and titanium alloys . Required to maintain a neutral atmosphere in the furnace or in a weakly oxidizing atmosphere heating . Never allow the use of hydrogen is heated , try to avoid using a reducing atmosphere to prevent hydrogen absorption . When using direct injection of fuel heating to prevent the flame surface to prevent excessive oxidation or by carbon. When heat treated plate and bottom plate are separated to use , generally before heat treatment, heating , cleaning up the furnace must be strictly other metal oxide , the surface should not have oil and water.
In order to minimize the impact of the atmosphere , can be vacuum annealing furnace , vacuum hardening furnace . Require high vacuum degree of negative fourth power mmHg 1 * 10 can also be heated in a variety of inert gas in the furnace .surgical implant titanium But requires inert gas purity higher than 99.99%.
Titanium and titanium alloys after heat treatment of cooling air-cooled and water-cooled primarily and in some cases also used oil cooling, furnace cooling or air cooling .
Titanium and titanium alloys in a + β / β phase transition point is important to determine the basic parameters of the heat treatment process . Due to differences in the raw materials and the processing history , the chemical composition of titanium alloy , in particular the content of the different elements in the gap , a titanium between each batch + β / β transformation point is different . In practice, we found that the heat treatment , the heat treatment can enhance the number a + β and β titanium alloy, since the fluctuations in disguise point , when a heat treatment at a specified time and temperature , often different in different batches of titanium the microstructure and mechanical properties. Therefore, we recommend that each batch of titanium are to be measured a + β / β phase transition point , and accordingly within the recommended range of heat treatment process to select a specific process parameters.
Of titanium and titanium alloys - Determination of the phase transition point has metallographic , X-ray diffraction , high-temperature metallurgical method, resistance method , expansion method and computer law. Metallographic method used widely , but a long period , the impact of many factors . Expansion method and resistance method is relatively quick determination titanium rod. Calculation method is based on the effects of various elements on the titanium phase transition temperature to calculate the phase transition point . According to the average nominal composition of impurities always produce titanium and titanium alloy ingots and titanium calculated a + β β phase transition point and the measured value / is quite close .