The existence of defects in titanium forgings, some will affect the quality of subsequent processes or processing, and some will seriously affect the performance and use of titanium forgings, or even greatly reduce the service life of the finished parts and endanger safety. Specifically, the appearance quality inspection of titanium forgings is to check whether the shape and geometric dimensions of titanium forgings comply with the drawings, whether there are defects on the surface of titanium forgings, what nature the defects are, and what their morphological characteristics are. The inspection content of the surface condition is generally to check whether there are surface cracks, folds, wrinkles, pits, orange peels, blisters, scars, corrosion pits, bruises, foreign objects, underfill, pits, lack of flesh, etc. on the surface of titanium forgings. Scratches and other defects. The internal quality inspection is to check the inherent quality of the titanium forgings themselves, which is a quality condition that cannot be discovered by the appearance quality inspection. It includes not only checking the internal defects of the titanium forgings, but also checking the mechanical properties of the titanium forgings, and for important parts and key parts. Or large titanium forgings should also undergo chemical composition analysis. For internal defects, we will use low-magnification inspection, fracture inspection, and high-magnification inspection to inspect titanium forgings for internal cracks, shrinkage cavities, looseness, coarse grains, white spots, dendrites, streamlines that do not conform to the shape, and streamlines. Defects such as disorder, cross-flow, coarse crystal ring, oxide film, delamination, overheating, over-burning structure, etc. As for the mechanical properties, it mainly checks the normal temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high-temperature instantaneous fracture strength, high-temperature sustained strength, long-lasting plasticity and high-temperature creep strength.
Since titanium forgings are made into titanium parts, their stress, importance, and working conditions are different during use, and the materials and metallurgical processes used are also different. Therefore, titanium forgings are processed in different parts according to the above conditions and in accordance with the requirements of this department. Divided into categories, different departments and different standards classify titanium forgings differently. But no matter what, the overall quality inspection of titanium forgings is inseparable from two major types of inspections, namely appearance quality and internal quality inspection. However, the categories of titanium forgings are different, and their specific inspection items, inspection quantities and inspection requirements Just different. For example, some industrial departments classify structural steel, stainless steel, and heat-resistant steel titanium forgings into Category IV for inspection; some departments classify aluminum alloy titanium forgings and die titanium forgings into Category III for inspection based on their usage; and some departments classify them into Category III for inspection. Aluminum alloy and copper alloy titanium forgings are divided into Category IV for inspection.
Therefore, in order to ensure or improve the quality of titanium forgings, in addition to strengthening quality control in the process and taking corresponding measures to prevent the occurrence of defects in titanium forgings, necessary quality inspections should also be carried out to prevent problems with subsequent processes (such as heat treatment, surface treatment, Titanium forgings with defects that have adverse effects on performance (cold working) and have adverse effects on performance are flown into subsequent processes. After quality inspection, remedial measures can be taken on the finished titanium forgings according to the nature of the defects and the extent of their impact on use, so that they meet technical standards or usage requirements. In a sense, the quality inspection of titanium forgings is, on the one hand, to check the quality of the finished titanium forgings, and on the other hand, it is to point out the direction for improvement of the forging process, thereby ensuring that the quality of titanium forgings meets the requirements of titanium forging technical standards and meets the requirements of titanium forging technical standards. Requirements for design, processing and use. The quality inspection of titanium forgings includes inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to the inspection of geometric dimensions, shape, surface conditions and other items of titanium forgings; internal quality inspection mainly refers to the inspection of chemical composition, macrostructure, microstructure and mechanical properties of titanium forgings.
