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Method for evaluating material sub-surface machining damage layer thickness

A technology of subsurface damage and damage layer, which is applied in the evaluation field of material subsurface processing damage layer thickness, can solve the problem of non-damage detection difficulty of subsurface damage layer thickness, achieve wide applicability and reduce the number of tests

Active Publication Date: 2015-03-25
SHENYANG AEROSPACE UNIVERSITY
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Problems solved by technology

[0007] The technical problem to be solved in the present invention is to overcome the deficiencies of the prior art and provide a method for evaluating the thickness of the subsurface processing damage layer that is less destructive to samples or the environment in view of the current situation that the thickness of the subsurface damaged layer of the material is not difficult to detect without damage.

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  • Method for evaluating material sub-surface machining damage layer thickness
  • Method for evaluating material sub-surface machining damage layer thickness
  • Method for evaluating material sub-surface machining damage layer thickness

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Embodiment Construction

[0029] The evaluation method of the present invention first detects the surface roughness of the material sample: if the range of the surface roughness of the material sample is not within Ra50nm~400nm, the test is abandoned; if the range of the surface roughness of the material sample is Ra50nm~400nm; then the material sample is tested. Indentation test; the process is as follows: first set the load, with 45μN as the initial load and 50-200μN as the increment, set the load in turn, and the end load is 1500μN; the increment between every two adjacent set loads It can be the same or different; then carry out the indentation test on the material sample, carry out the loading-unloading test in order according to the set load from small to large and record the maximum displacement value of the indenter in each load loading-unloading test; when When the maximum displacement value produced by the selected load increases by more than 50% compared with the maximum displacement value pr...

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Abstract

The invention belongs to the technical field of material surface machining quality evaluation and in particular relates to a method for evaluating material sub-surface machining damage layer thickness. By utilizing an indentation test, the sub-surface damage layer thickness is evaluated by virtue of a displacement change rule generated by a pressure head under the actions of different loads; when the increment of the maximum displacement value of the selected load is greater than 50 percent compared with the maximum displacement value of the previous load, the maximum displacement value generated by the selected load is the evaluation value of the sub-surface damage layer thickness; the increment of the selected load can be changed according to the requirements of different processes, so that the accuracy of the evaluation value of the sub-surface damage layer thickness is adjusted; and the evaluation value of the sub-surface damage layer thickness is determined in the shortest time. With the adoption of the method, the value of the sub-surface damage layer thickness is evaluated, although an accurate value of the sub-surface damage layer thickness cannot be obtained and a certain damage of the material surface is generated, indentation in a micrometer scale is generated on the material surface only, the damage degree is obviously smaller than that in a corroding and sectioning method, and destruction of the environment is not caused.

Description

technical field [0001] The invention belongs to the technical field of material surface processing quality evaluation, and in particular relates to a method for evaluating the thickness of a material subsurface processing damage layer. Background technique [0002] With my country's increasing requirements for high-precision processing in the fields of energy, space, national defense equipment, and integrated circuits, the evaluation of the surface processing integrity of various precision components is the basis for meeting the increasing technical indicators. Surface integrity evaluation mainly includes surface roughness, surface profile and thickness of subsurface damage layer. At present, there are many methods for quality evaluation of surface roughness and surface profile, such as surface roughness meter and surface profiler. The evaluation of sub-surface processing quality can be mainly divided into two types: damage detection and non-damage detection. [0003] At p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/44
Inventor 王奔郑耀辉王明海李晓鹏刘东玺
Owner SHENYANG AEROSPACE UNIVERSITY
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