Industrial pure titanium is the most widely used titanium and titanium alloy material due to its low cost and easy production. The α-ti alloy in industrial pure titanium is commonly used in aviation, shipbuilding and chemical industries, and its impurity content has a great influence on its cold workability and the mechanical properties of finished materials. Increasing impurity content can increase the strength of titanium and reduce its plasticity. Once its quality is improperly controlled, the performance of the titanium material will not be guaranteed, and even the titanium ingot or billet cannot be processed into materials, resulting in waste products. This shows that the impurities The element content has a great influence on the mechanical properties of titanium materials.
Therefore, in the production of industrial pure titanium, the impurity content of titanium must be strictly controlled. After the pure titanium material is processed into titanium wires of different specifications, the problem of brittle fracture occurs in the subsequent drawing process. According to the site conditions, there is only a very small amount of titanium ingot forging remaining material and different specifications of the titanium material after processing. Titanium wire specifications range from 47.0, 465.5, 45.0, 44.5, and 03.0. In response to this situation, the failed samples were retrieved according to the method of random sampling and numbered from largest to smallest diameter: a, b, e, d, p. A small amount of titanium ingot forging numbered g was then inspected and analyzed.
The nature of the brittle fracture problem of titanium wire has a lot to do with its impurity content. Therefore, it is necessary to understand its impurity source. The impurity elements in industrial pure titanium include Fe, S, 0, N, H, etc., and the content of these impurity elements is its finished product. The performance of the material has a greater impact, and once the impurity content is improperly controlled, the performance of the titanium material will not be guaranteed. It is not only difficult to process and even causes the risk of fracture. Due to the high chemical activity of titanium and titanium alloys, during the processing process , It will react violently with the oxygen and nitrogen in the atmosphere to form a dense oxide layer and getter layer, and prevent the re-infiltration and oxidation of gas. Therefore, oxygen is added as an added element during the production of titanium wire.
The nitrogen in the titanium wire mainly comes from several aspects in the preparation process of sponge titanium:
(1) The residual air in the assembly of the reduction distillation equipment is absorbed by the titanium:
(2) All nitrogen remaining in the argon gas is sucked into the titanium;
(3) The gas leaked by the reduction distillation operation and the gas leaked when the negative pressure occurs in the discharge of MC2 and other reactors will increase the nitrogen content of titanium. After the gas leaks, yellow titanium nitride is formed on the surface of the sponge titanium, which is easier to identify.
According to the above analysis, it can be known that the source of nitrogen in the titanium wire of this failure sample is sponge titanium, so the entry of nitrogen in the subsequent processing can be excluded. On the other hand, from the principle of plastic deformation of metal and related literature, it can be known that the formation of nitrogen atoms and titanium The interstitial solid solution hinders the slip of dislocations, which increases the strength of titanium and decreases its coherence, which affects its room temperature tensile properties. Among the interstitial impurities, the strengthening effect of N is the most obvious.
No comments:
Post a Comment