A Method for Evaluating Plastic Deformation Amount and Depth of Surface Strengthening Layer
A technology of plastic deformation and surface strengthening layer, which is applied in the field of evaluating the plastic deformation amount and depth of the surface strengthening layer, can solve the problems such as the difficulty in evaluating the plastic deformation amount and depth of the surface strengthening layer, and achieves high engineering application value, test accuracy and high quality. Accurate effect
Active Publication Date: 2022-01-07
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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[0005] The object of the present invention is: to propose a method for evaluating the plastic deformation and depth of the surface strengthening layer, which can solve the difficult problem of evaluating the plastic deformation and depth of the surface strengthening layer, and provide a furnace test piece inspection method for the surface strengthening effect. means to meet the needs of surface strengthening process parameter curing before batch production and process quality inspection during batch production
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[0042] The present invention adopts the test block with the furnace, uses the microhardness tester to prefabricate the pit on the cross section perpendicular to the surface to be strengthened, and evaluates the plastic deformation at different depths by analyzing the deformation degree of the pit before and after strengthening. Quantity threshold to evaluate the depth of the reinforcement layer. Including the following steps:
[0043] (1) Polish the cross-section perpendicular to the surface of the titanium alloy test block to be strengthened, and prefabricate a square pit on the cross-section with a microhardness tester. The lengths of the two diagonal lines of the pit are r=15.2 μm and s respectively =14.0μm, where the diagonal line with length r is perpendicular to the surface to be strengthened, the distance between the center of the first pit and the surface to be strengthened is 30μm, the distance L between the odd and even numbered pits in the X direction is 30μm, and t...
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The invention belongs to the surface treatment technology of parts, and relates to a method for evaluating the plastic deformation amount and depth of a surface strengthening layer; the invention uses a microhardness tester to prefabricate pits in the cross section of a test block, and when the surface to be strengthened is surface strengthened, When the near-surface layer is compressed, the pit also undergoes plastic deformation correspondingly, and the amount of plastic deformation at this depth is obtained by calculating the degree of deformation of the pit. And set the deformation threshold to obtain the depth value of the deformed layer. Compared with the traditional metallographic method, the test accuracy and accuracy are higher; this method adopts the test block with the furnace for evaluation, which is simple and convenient, and will not damage the real parts. The engineering application value is high; this method can obtain the plastic deformation in a large range of depth near the surface by adjusting the distance and staggered arrangement of the pits to the surface to be strengthened, which is accurate and efficient.
Description
technical field [0001] The invention belongs to part surface treatment technology, and relates to a method for evaluating the amount and depth of plastic deformation of a surface strengthening layer. Background technique [0002] Surface strengthening is based on the theory of plastic deformation strengthening. By introducing plastic deformation on the metal surface, a structure strengthening layer and a residual compressive stress layer are formed, thereby improving the fatigue performance, wear resistance and stress corrosion resistance of the metal. The current main surface strengthening techniques include shot peening, laser shock, hole extrusion, ultrasonic shock, rolling, and two-phase flow. The hard medium or high-pressure shock wave acts on the metal surface to multiply dislocations on the surface of the material, resulting in strain hardening and high-amplitude residual compressive stress. [0003] In engineering applications, the process parameters before batch pr...
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IPC IPC(8): C21D1/06G01N33/20
CPCC21D1/06G01N33/20
Inventor 罗学昆王欣王强马世成宇波汤智慧
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS