Titanium alloy forgings, TC4 titanium forgings quality inspection methods

TC4 titanium forgings defects exist, some will affect the quality of subsequent processes or processing quality, some seriously affect the performance of titanium forgings, titanium alloy forgings and the use of titanium alloy forgings, and even greatly reduce the service life of the manufactured parts, endangering safety. Therefore, in order to or improve the quality of titanium forgings, in addition to strengthening quality control in the process, take appropriate measures to eliminate the generation of defects in titanium forgings, should also carry out the necessary quality inspection, to prevent titanium forgings with the subsequent process (such as heat treatment, surface treatment, cold machining) and the use of the performance of the defects of the bad impact of the flow of the subsequent process. After quality inspection, but also according to the nature of the defects and the degree of impact on the use of titanium forgings have been made to take remedial measures, so that it meets the technical standards or the use of the requirements.

Therefore, titanium forgings quality inspection in a sense, on the one hand, the quality of manufactured titanium forgings, on the other hand, is to point out the direction of improvement of the forging process, so that the quality of titanium forgings in line with the requirements of titanium forgings technical standards, and to meet the design, processing, use of the requirements. The inspection of titanium forgings includes the inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to the titanium forgings of geometric size, shape, surface condition and other items of inspection; internal quality inspection mainly refers to the titanium forgings of chemical composition, macro-organization, titanium forgings microstructure and mechanical properties and other items of inspection.
Specifically, the appearance of titanium forgings quality inspection is to check the shape of titanium forgings, geometric dimensions in line with the provisions of the drawings, titanium forgings surface defects, what is the nature of the defects, and what are their morphological characteristics. The inspection of the surface state is generally to check whether the surface of the titanium forgings have surface cracks, folding, creasing, pressure pits, orange peel, blistering, scarring, corrosion pits, bruises, foreign objects, unfilled, pits, missing meat, scratches and other defects. The internal quality inspection is to check the internal quality of titanium forgings itself, is the appearance of the quality inspection can not be found in the quality of the situation, it contains both the internal defects of titanium forgings, also contains checking the mechanical properties of titanium forgings, and important pieces, key pieces or large titanium forgings should also be analyzed for chemical composition. For the internal defects we will be through the low inspection, fracture inspection, high inspection methods to check whether the titanium forgings exist such as internal cracks, shrinkage holes, loose, coarse crystal, white spots, dendritic crystals, flow line does not conform to the shape of the flow line disorders, flow through the flow, coarse crystal ring, oxide film, delamination, overheating, overcooking organization and other defects. And for mechanical properties is mainly to check the room temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous breaking strength, high temperature enduring strength, enduring plasticity and high temperature creep strength.

As titanium forgings made of parts, in the use of its force, importance, working conditions are different, the materials used and metallurgical process is also different, so different parts based on the above and in accordance with the department's requirements of titanium forgings will be divided into categories, different departments, different standards for titanium forgings are also different categories. But no matter how, for titanium forgings quality inspection as a whole can not be separated from the two categories of inspection, that is, the appearance of the quality and internal quality inspection, only the categories of titanium forgings are different, the specific test items, the number of inspections and inspection requirements are different. For example, some industrial sectors will be structural steel, stainless steel, heat-resistant steel titanium forgings into Ⅳ class for inspection, some departments will be aluminum alloy titanium forgings and mold titanium forgings according to its use into Ⅲ class for inspection, there are also departments will be divided into Ⅳ class of aluminum alloys, copper alloys titanium forgings for inspection.