Forging of titanium and titanium alloys!

Most titanium and titanium alloys require various forms of pressure processing such as forging, rolling, extrusion, die forging, and stamping. Among them, forging and stamping are more commonly used in machinery manufacturing plants.

The forging performance of titanium alloys is close to that of low-alloy steels, but compared with the latter, it has the following characteristics.

1. To prevent oxygen contamination, titanium alloys should be heated in a slightly oxidizing atmosphere. In order to reduce the degree of oxidation contamination, the time for high-temperature heating should be as short as possible. The process should also be designed reasonably to reduce the number of repeated heating. titanium forging / Titanium Threaded Forged Fitting / Gr3 Pure Titanium Plate

2. The deformation resistance of titanium alloys increases rapidly with the increase of deformation speed. The plasticity of titanium alloys in dynamic conditions is twice that in static conditions, so a reasonable deformation processing rate is required. Titanium alloys have poor thermal conductivity. During pressure processing, if the deformation of a local area is large, the temperature of the area will increase, causing grain growth, resulting in uneven organization of the alloy workpiece.

3. The organizational properties of titanium alloy parts are largely determined by the initial hot deformation processing conditions, so special attention should be paid to controlling the organization of the billet. If the bad material structure is coarse, it cannot be expected to be improved during the subsequent hot working and heat treatment of the finished product. The Widmanstatten structure in the blank cannot be fully broken during the processing of the finished product even if the deformation degree reaches 50%. This feature is particularly important for the production of products that require equiaxed structure to obtain fatigue performance.

The temperature of hot deformation processing should be determined according to the B phase transformation point of the alloy and refer to the process plasticity diagram. Generally, a and a+β titanium alloy forging are carried out in the upper part of the a+β phase region. If the temperature is too high, the structure is easy to coarsen; if the temperature is too low, the deformation resistance of the alloy is large and it is easy to crack, so the forging temperature range of titanium alloy is narrow. In production, the maximum heating temperature of various alloys is usually specified for the last heating, and it is not allowed to exceed this temperature.