TC4 (grade 5 corresponding to foreign grade) titanium forging defects exist, partly affect the processing quality or processing quality of the subsequent process, partly serious in performance and use of titanium forging and titanium alloy forging Impacting and significantly reducing production The service life of finished parts jeopardizes safety.
Therefore, in order to secure or improve the quality of titanium forged products, strengthen the quality control in the process, take measures to prevent the occurrence of defects in titanium forged products, and carry out the subsequent processes (heat treatment, surface treatment). The necessary quality inspections should also be performed to prevent (such as cold working) and the use of defective titanium forgings that adversely affect the performance of subsequent processes. After quality inspection, depending on the nature of the defects and the degree of their impact on the use, corrective action can be taken on the manufactured titanium forgings to meet the technical standards or requirements of use.
Therefore, in a sense, quality inspection of titanium forgings is, on the one hand, checking the quality of titanium forgings made, and on the other hand, that the quality of titanium forgings meets the requirements of the titanium forging technical standards. To assure, point out the direction of improvement of the forging process, and meet the requirements of design, processing and use. Inspection of titanium forging quality includes inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to inspection of geometrical dimensions, shape and surface condition of titanium forged products, and internal quality inspection mainly involves inspection of chemical composition, macrostructure, microstructure and mechanical properties of titanium forged products.
Point to titanium Titanium forging appearance quality inspection specifically means that the shape and geometrical dimensions of the titanium forged product conform to the rules of the drawing, whether the surface of the titanium forged product is defective, the nature of the defect, and the morphology To check the characteristics. The inspection contents of the surface condition generally include surface cracks, folds, wrinkles, pits, orange peels, blisters, scars, corrosion pits, scratches, foreign substances, underfills, pits, meat chips, and scratches on the surface of titanium forged products. Bad. The internal quality inspection is to check the internal quality of the titanium forged product itself, which is a quality condition that cannot be obtained by the appearance quality inspection. I will. Alternatively, large titanium forgings should also be subjected to chemical composition analysis. For internal defects, using low-power inspection, destructive inspection, high-power inspection, titanium forgings do not fit internal cracks, shrinkage holes, loosening, coarse crystals, white specks, dendrites, and shapes and streamlines Check for streamlines. Disturbances, flows, rough crystal rings, oxide films, delamination, overheating, texture overfire, and other defects. Mechanical properties are mainly to check normal temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instant fracture strength, high temperature durable strength, durable plasticity, high temperature creep strength.
There are two types of overall quality inspection of titanium titanium forged products, appearance quality and internal quality, but the types of titanium forged products are different, and the specific inspection items, inspection quantity, and inspection requirements are different.
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