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Home / Media / Industry News / How to deal with surface defects of titanium forgings after machining?

How to deal with surface defects of titanium forgings after machining?

Update:2022-04-28
Abstract:After titanium forgings are made into titanium parts, the force, importance and working conditions i...
After titanium forgings are made into titanium parts, the force, importance and working conditions in use are different, 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 is inseparable from two kinds of inspections, namely appearance quality inspection and internal quality inspection. However, due to different types of titanium forgings, the specific inspection items, inspection quantities and inspection requirements are also different. For example, some industrial departments classify structural steel, stainless steel, heat-resistant steel and titanium forgings into categories for inspection, some departments classify aluminum alloy titanium forgings and die titanium forgings into categories for inspection according to the conditions of use, and some departments classify aluminum alloy forgings into categories for inspection. , Copper alloy titanium forgings are classified into 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 drawings, whether there are defects on the surface of titanium forgings, what is the nature of the defects, and what are their morphological characteristics. The inspection content of the surface condition is generally to check whether there are surface cracks, folds, wrinkles, pressure pits, orange peels, blistering, scars, corrosion pits, collisions, foreign bodies, incompleteness, pits, lack of meat, scratches and other defects on the surface of titanium forgings. . Internal quality inspection is to check the internal quality of titanium forgings, which is a quality condition that cannot be found by appearance quality inspection. It not only includes checking the internal defects of titanium forgings, but also checking the mechanical properties of titanium forgings, and at the same time, chemical composition analysis should be carried out on important parts, key parts or large titanium forgings. For internal defects, we will check titanium forgings for internal cracks, shrinkage cavities, porosity, coarse grains, white spots, dendrites, streamlines out of shape, streamlines disorder, flow through, coarse-grained rings, oxide films, delamination, Defects such as overheating and overburning tissue. In terms of mechanical properties, the main inspections are room temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous rupture strength, high temperature durable strength, durable plasticity and high temperature creep strength.

Some defects of titanium forgings will affect the processing quality or processing quality of subsequent processes, while other defects will seriously affect the performance and use of titanium forgings, and even greatly reduce the service life of finished parts and endanger 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 corresponding measures to eliminate the defects of titanium forgings, necessary quality inspections should also be carried out to prevent the existence of subsequent processes (such as heat treatment, surface treatment, etc.). and cold working) and defective titanium forgings with adverse effects on performance flow into subsequent processes. After the quality inspection, remedial measures can be taken for the manufactured titanium forgings to meet the technical standards or use requirements according to the nature of the defects and the degree of influence on the use.

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