Treatment method of surface defects after titanium forging parts

After titanium forgings are made into parts, the forces, importance and working conditions are different in use, and the materials and metallurgical processes are also different. Therefore, titanium forgings are classified in different parts according to the above conditions and according to the requirements of the department, and titanium forgings are classified differently in different departments and standards. However, the quality inspection of titanium forgings cannot be separated from two kinds of inspection, namely, appearance quality inspection and internal quality inspection. However, due to different categories of titanium forgings, the specific inspection items, inspection quantities and inspection requirements are also different. For example, some industrial departments will be structural steel, stainless steel, heat-resistant steel titanium forgings classified into classes for inspection, some departments will be aluminum alloy titanium forgings, die titanium forgings according to the conditions of use classified into classes for inspection, some departments will be aluminum alloy, copper alloy titanium forgings classified into classes for inspection.

Specifically, the appearance quality inspection of titanium forgings is to check whether the shape and geometric size of titanium forgings comply with the provisions of the drawing, whether the surface of titanium forgings is defective, what is the nature of the defect, and what is its morphological characteristics. The inspection content of the surface condition is generally to check whether the surface of the titanium forging has surface cracks, folds, wrinkles, pits, orange peel, bubbles, scars, corrosion pits, collisions, foreign bodies, incomplete, pits, missing meat, scratches and other defects. Internal quality inspection is to check the internal quality of titanium forgings, which is a quality condition that can not be found by appearance quality inspection. It not only includes checking the internal defects of titanium forgings, but also includes checking the mechanical properties of titanium forgings, and chemical composition analysis should be carried out for important parts, key parts or large titanium forgings. For internal defects, we will check whether the titanium forgings have internal cracks, shrinkage holes, loose, coarse crystals, white spots, dendrites, streamline does not conform to the shape, streamline disorder, flow, coarse crystal ring, oxide film, delamination, overheating, overburned tissue and other defects. Mechanical properties, mainly check room temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous fracture strength, high temperature lasting strength, lasting plasticity and high temperature creep strength.

Some defects of titanium forgings will affect the processing quality or processing quality of the subsequent process, while other defects will seriously affect the performance and use of titanium forgings, and even greatly reduce the service life of finished parts, endangering safety. Therefore, in order to ensure or improve the quality of titanium forgings, in addition to strengthening the quality control in the process and taking appropriate measures to eliminate the defects of titanium forgings, the necessary quality inspection should also be carried out to prevent the flow of titanium forgings with defects that have adverse effects on the subsequent process (such as heat treatment, surface treatment and cold working) and performance. After quality inspection, remedial measures can be taken on the manufactured titanium forgings according to the nature of the defects and the degree of impact on the use, so that they meet the technical standards or use requirements.

Therefore, in a sense, the quality inspection of titanium forgings on the one hand is to test the quality of titanium forgings manufactured, and on the other hand is to indicate the direction of improvement for the forging process, so as to ensure that the quality of titanium forgings meets the technical standards of titanium forgings and meets the requirements of design, processing and use. The quality inspection of titanium forging includes the inspection of external quality and internal quality. The 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, macroscopic structure, microscopic structure and mechanical properties of titanium forgings.