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A technology of substrate surface and evaluation method, applied in the direction of analyzing materials, material analysis by optical means, optical testing of flaws/defects, etc., can solve problems such as inapplicability
Active Publication Date: 2021-06-04
DALIAN UNIV OF TECH
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Problems solved by technology
The above methods play a good role in their respective fields of application, but the above evaluation systems are not suitable for the surface of the base material for construction and molding where various pollutants coexist.
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Embodiment 1
[0039] The steps of using the present invention to evaluate the surface cleanliness of the small sample after simply purging with an air gun after milling are as follows:
[0040] 1) Select different areas, use the X-ray energy spectrum analyzer to detect the composition of the surface of the small sample part by surface scanning, combined with the observation of the ultra-depth microscope, determine the types of surface pollutants according to the composition and appearance characteristics as oil, particles, swarf.
[0041]2) Starting from the healing performance of the substrate interface formed by the construction of the metal substrate, evaluate the degree of hindrance to the healing of the substrate interface by oil, particles, and chips, and determine the weight coefficient WC corresponding to the pollutants according to the degree of hindrance to the substrate interface healing i , where the weight coefficients of oil, particles, and chips are expressed as: WC 1 , WC ...
Embodiment 2
[0045] The steps of using the present invention to evaluate the surface cleanliness of the small sample after purging with an air gun and ultrasonic cleaning for 15min after milling are as follows:
[0046] 1) Select different areas, use the X-ray energy spectrum analyzer to detect the composition of the surface of the small sample part by surface scanning, combined with the observation of the super depth of field microscope, determine the type of surface pollutants according to the composition and appearance characteristics, only particle pollutants remain .
[0047] 2) Starting from the healing performance of the substrate interface formed by the construction of the metal substrate, evaluate the degree of hindrance to the healing of the substrate interface by oil, particles, and chips, and determine the weight coefficient WC corresponding to the pollutants according to the degree of hindrance to the substrate interface healing i , where the weight coefficients of oil, partic...
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Abstract
The invention discloses a base material surface cleanliness evaluation method for metal base material construction and formation, which comprises the following steps of: setting weight coefficients corresponding to oil stains, particles and cuttings according to a test result, detecting pollution scores of different pollutants by using different methods respectively, and calculating the product sum of all pollution weight coefficients and pollution scores, so that the surface cleanliness is quantitatively represented. The invention provides an accurate and systematic surface cleanliness evaluation method for metal base material construction and forming. The pollutant weight coefficient is determined on the basis of the degrees of adverse effects of different pollutants on the healing of the substrate interface; and different detection methods are adopted for different pollutants, and pollution scores of the different pollutants are determined. According to the method, the pollution value is determined according to the sum of the products of the weight coefficients of the pollutants and the pollution scores, the contrast relation is formulated, and finally the cleanliness grade is determined, so that the surface cleanliness of the base material is accurately and quantitatively evaluated.
Description
technical field [0001] The invention belongs to the field of surface engineering, in particular to a method for evaluating the surface cleanliness of a metal base material for construction and forming. Background technique [0002] Large forgings are the core components of major equipment. At present, large forgings are mainly used in nuclear power plant support rings, nuclear power pressure vessel cylinders, and large-diameter pressure pipes. The metal substrate forming technology is a revolutionary technology proposed by the Institute of Metal Research, Chinese Academy of Sciences, which avoids the metallurgical defects caused by the size effect of the ingot in the past when preparing large forgings from large ingots. Metal substrate construction and forming technology takes small homogeneous casting billet as a unit, and after surface processing, cleaning billet assembly, vacuum packaging, high temperature deformation and other processes, an ultra-thick scale homogeneous ...
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