The existence of defects in TC4 titanium forgings can affect the processing quality or processing quality of subsequent processes, while others can seriously affect the performance and use of titanium forgings and titanium alloy forgings, and even greatly reduce the service life of the finished products, endangering safety. 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 inspections should also be conducted to prevent titanium forgings with defects that have adverse effects on subsequent processes (such as heat treatment, surface treatment, and cold processing) and service performance from flowing into subsequent processes. After quality inspection, remedial measures can also be taken for the fabricated titanium forgings based on the nature of the defects and the extent of their impact on use, so that they meet technical standards or use requirements.
Therefore, in a sense, the quality inspection of titanium forgings is, on the one hand, to control the quality of manufactured titanium forgings, and on the other hand, to point out the improvement direction for the forging process, so as to ensure that the quality of titanium forgings meets the requirements of the technical standards for titanium forgings, as well as the requirements for 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 the geometric dimensions, shape, surface condition, and other items of titanium forgings; The internal quality inspection mainly refers to the inspection of various items such as the chemical composition, macrostructure, microstructure, and mechanical properties of titanium forgings.
Specifically, the appearance quality inspection of titanium forgings is to check the shape of titanium forgings. Whether the geometry conforms to the specification of the drawing, whether there are defects on the surface of the titanium forgings, what are the nature of the defects, and what are their morphological characteristics. The inspection content of surface state is generally to check whether there is surface crack, folding, creasing and pressing pit on the surface of titanium forgings. Orange peel blistering, spot scars, corrosion pits, bruises, foreign objects, not filled, pits, lack of meat, scratches and other defects. And the inspection of internal quality is to check the internal quality of titanium forging itself, is the appearance of quality inspection can not be found, it includes the inspection of the internal defects of titanium forging, also contains the inspection of the mechanical properties of titanium forging, and important parts, key parts or large titanium forging should also carry out chemical composition analysis. For the internal defects, we will pass the low-power inspection, fracture inspection, high-power inspection method to check whether there are defects such as internal crack, shrinkage hole, loose, coarse crystal, white dot dendritic crystal streamline does not conform to the shape, streamline disorder, flow through, coarse crystal ring, oxide film, stratification, overheating and overburning tissue. And for mechanical properties is mainly to check the normal temperature tensile strength, plasticity, toughness. Hardness, fatigue strength, high temperature instantaneous fracture strength, high temperature lasting strength, lasting plasticity and high temperature creep strength, etc.
Because titanium forgings made of parts, in the process of use of its stress, importance, working conditions are different, the material and metallurgical process is different, so different parts according to the above situation and in accordance with the requirements of the department of titanium forgings into categories, different departments, different standards of titanium forgings classification is different. But no matter how, for the overall quality inspection of titanium forgings are inseparable from two categories of inspection, that is, the appearance of quality and internal quality inspection, but the category of titanium forgings is different, its specific inspection items, inspection quantity and inspection requirements are different. For example, some industrial departments divide structural steel, stainless steel and heat-resistant steel titanium forgings into category IV for inspection, some departments divide aluminum alloy titanium forgings and die titanium forgings into sub-categories for inspection according to their use, and some departments divide aluminum alloy into sub-categories for inspection. Copper alloy titanium forgings are divided into IV classes for inspection.
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