The existence of defects in titanium forgings may affect the processing quality or processing quality of subsequent processes, and some seriously affect the performance and use of titanium forgings, and even greatly reduce the service life of the manufactured parts and endanger safety. Therefore, in order to guarantee or improve the quality of titanium forgings, in addition to strengthening the quality control in the process and taking corresponding measures to prevent the occurrence of defects in titanium forgings, the necessary quality inspection should be carried out to prevent the subsequent processes (such as heat treatment, surface treatment, Cold working) and the use of titanium forgings with defects that have a bad effect on performance flow into subsequent processes. After quality inspection, according to the nature of the defect and the extent of the impact on the use of remedial measures can be taken to make titanium forgings to meet technical standards or requirements for use.
Therefore, in a sense, the quality inspection of titanium forgings is to check the quality of manufactured titanium forgings on the one hand, and to point out the improvement direction of the forging process, so as to ensure that the quality of titanium forgings meets the requirements of titanium forging technical standards. And meet the design, processing, and use requirements. The inspection of the quality of titanium forgings includes the inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to the inspection of the geometric size, shape and surface condition of titanium forgings; 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 geometry of titanium forgings conform to the requirements of the drawing, whether the surface of titanium forgings is defective, what kind of defects are, and what are their morphological characteristics. The inspection of the surface condition is generally to check whether the surface of the titanium forging has surface cracks, folds, wrinkles, pits, orange peel, blistering, scars, corrosion pits, bumps, foreign objects, underfill, pits, lack of meat, Defects such as scratches. The internal quality inspection is to check the internal quality of the titanium forging itself. It is a quality condition that cannot be found by the appearance quality inspection. It includes both the inspection of the internal defects of the titanium forging and the mechanical properties of the titanium forging. Or large-scale titanium forgings should also be analyzed for chemical composition. For internal defects, we will use low magnification inspection, fracture inspection, and high magnification inspection to check whether titanium forgings have internal cracks, shrinkage, looseness, coarse grains, white spots, dendritic crystals, and streamlines that do not conform to the shape and streamlines. Disorders, flow through, coarse crystal rings, oxide film, delamination, overheating, overburning and other defects. As for the mechanical properties, the tensile strength, plasticity, toughness, hardness, fatigue strength, high-temperature transient fracture strength, high-temperature durable strength, durable plasticity, and high-temperature creep strength are checked at room temperature.
After the titanium forgings are made into parts, their stress, importance and working conditions are different during use. The materials and metallurgical processes are also different. Therefore, different parts are divided into titanium forgings according to the above situation and according to the requirements of this department. The classification of titanium forgings is different according to the classification, different departments, and different standards. But no matter what, the quality inspection of titanium forgings is inseparable from the two major types of inspection, namely the appearance quality and internal quality inspection, but the types of titanium forgings are different, and the specific inspection items, inspection quantities and inspection requirements It's different. For example, some industrial departments classify structural steel, stainless steel, and heat-resistant steel titanium forgings into Class IV for inspection, some departments classify aluminum alloy titanium forgings and die titanium forgings into Class III for inspection, and others Aluminum alloy and copper alloy titanium forgings are classified into Class IV for inspection.