Since titanium forgings are made into parts, their stress, importance, and working conditions are different during use, and the materials and metallurgical processes used are also different. Therefore, different parts are divided into titanium forgings according to the above conditions and the requirements of this department. Different categories, different departments, and different standards classify titanium forgings differently. But in any case, the overall quality inspection of titanium forgings is inseparable from two types of inspections, namely the inspection of appearance quality and internal quality, but the types of titanium forgings are different, and their specific inspection items, inspection quantities and inspection requirements. Just different. For example, some industrial departments divide structural steel, stainless steel, heat-resistant steel and F9 Titanium Forging into Class IV for inspection, some departments classify aluminum alloy titanium forgings and die titanium forgings into Class III for inspection according to their usage, and some departments will Aluminum alloy, copper alloy and titanium forgings are divided into IV categories for inspection.
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 the surface of titanium forgings is defective, what kind of defects are, and what are their morphological characteristics. The inspection content of the surface condition is generally to check whether the surface of titanium forgings has surface cracks, folds, wrinkles, pressure pits, orange peel, blistering, scars, corrosion pits, bumps, foreign objects, underfill, pits, lack of meat, etc. Defects such as scratches. The internal quality inspection is to check the internal quality of the titanium forgings itself, which is a quality condition that cannot be found by the appearance quality inspection. It includes not only checking the internal defects of the titanium forging, but also checking the mechanical properties of the titanium forgings. Or large titanium forgings should also undergo chemical composition analysis. For internal defects, we will check whether the titanium forgings have internal cracks, shrinkage holes, porosity, coarse grains, white spots, dendrites, streamlines that do not conform to the shape, and streamlines through low-power inspection, fracture inspection, and high-power inspection methods. Defects such as disorder, flow through, coarse grain ring, oxide film, delamination, overheating, and overburning structure. For the mechanical properties, it is mainly to check the normal temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous rupture strength, high temperature durable strength, durable plasticity and high temperature creep strength.
The existence of defects in titanium forgings, some will affect the processing quality or processing quality of subsequent processes, and some will seriously affect the performance and use of titanium forgings, and even greatly reduce the service life of the finished products and endanger 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 carried out to prevent subsequent processes (such as heat treatment, surface treatment, Cold working) and titanium forgings with defects that have adverse effects on performance are passed into the subsequent process. After the quality inspection, remedial measures can also be taken for the manufactured titanium forgings according to the nature of the defects and the degree of influence on the use, so that they meet the technical standards or the requirements of use.
Therefore, in a sense, the quality inspection of titanium forgings, on the one hand, is to check the quality of the produced titanium forgings, and on the other hand, it is 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 technical standards for titanium forgings. And meet the requirements of design, processing and use. The quality inspection of titanium forgings includes the inspection of appearance quality and internal quality. The appearance quality inspection mainly refers to the inspection of the geometric size, shape, surface condition and other items of the titanium forgings; the internal quality inspection mainly refers to the inspection of the chemical composition, macrostructure, microstructure and mechanical properties of the titanium forgings.
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