The existence of defects in TC4 titanium forgings may affect the quality of subsequent processing or processing, and some may seriously affect the performance and use of titanium forgings and titanium alloy forgings. 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 eliminate the occurrence of defects in titanium forgings, necessary quality inspection should also be carried out, Prevent titanium forgings with defects that have adverse effects on subsequent processes (such as heat treatment, surface treatment, cold processing) and service performance from flowing into subsequent processes. After the quality inspection, remedial measures can also be taken for the made titanium forgings according to the nature of the defect and the extent of its impact on the use to make them meet the technical standards or use requirements.

Therefore, in a sense, the quality inspection of titanium forgings is, on the one hand, to check the quality of the made titanium forgings, and on the other hand, to point out the direction of improvement for the forging process, so as to ensure that the quality of titanium forgings meets the requirements of the technical standards for titanium forgings, and meets the requirements of design, processing and use. The quality inspection of titanium forgings includes the inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to the inspection of geometric dimension, shape, surface condition and other items of titanium forgings; The internal quality inspection mainly refers to the inspection of chemical composition, macrostructure, microstructure and mechanical properties of titanium forgings.

Specifically, the appearance quality inspection of titanium forgings is to check whether the shape and geometric dimensions of titanium forgings meet the requirements of the drawing, whether there are defects on the surface of titanium forgings, what kind of defects are they, and what their morphological characteristics are. The inspection content of surface state is generally to check whether there are surface cracks, folds, wrinkles, indentation pits, orange peel, blisters, scars, corrosion pits, bruises, foreign objects, unfilled, pits, lack of flesh, scratches and other defects on the surface of titanium forgings. The inspection of internal quality is to check the internal quality of titanium forgings, which is a quality condition that cannot be found in the appearance quality inspection. It includes both the inspection of internal defects of titanium forgings and the inspection of mechanical properties of titanium forgings. Chemical composition analysis should also be carried out for important parts, key parts or large titanium forgings. For internal defects, we will check whether titanium forgings have defects such as internal crack, shrinkage cavity, porosity, coarse grain, white spot, dendrite crystal, streamline inconformity with shape, streamline disorder, flow penetration, coarse grain ring, oxide film, delamination, overheating, overburning structure, etc. by means of low magnification inspection, fracture inspection, high magnification inspection. The mechanical properties mainly include tensile strength, plasticity, toughness, hardness, fatigue strength, high-temperature instantaneous breaking strength, high-temperature endurance strength, durable plasticity and high-temperature creep strength.

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