SAE AMS 2546-2004 Laser Peening《激光喷射》.pdf
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1、 AEROSPACE MATERIAL SPECIFICATION Laser Peening AMS 2546Issued 1. SCOPE 1.1 Purpose: This specification covers the requirements for computer controlled laser peening of metal part surfaces to induce residual compressive stresses at and beneath the surface. 1.2 Application: Laser peening is utilized
2、to induce compressive residual stresses at and beneath the surface of metal parts to depths of 0.040” to 0.080” (1 to 2 mm) depending on the metal properties and the laser peening processing parameters. These residual stresses can provide improved fatigue life and stress corrosion resistance, althou
3、gh usage is not limited to such applications. 1.3 Safety a standardized technique for laser peening of the coupon; and a standardized device and method for measuring the coupon before and after laser peening. 3.3.1.1 The metal coupon to use for process verification of laser peening shall be an SAE 1
4、070 spring steel Almen C test strip and shall be processed on one side only. All test strips used for intensity verification shall conform to SAE J442 except thickness and flatness tolerance shall be 0.0005 inch (0.013 mm). A method of compensating for initial out of flatness may be used, if approve
5、d by the cognizant engineering organization. However, mechanically deforming strips to meet the flatness requirement is not permitted. Hardness shall be 45 to 48 HRC and measured in accordance with ASTM E 18 at approximately 1/2 inch (12.7 mm) from either end on the longitudinal center line of a fla
6、t side using Rockwell “C” scale, or equivalent (see 8.9). To avoid hardness tester impressions on strips, a sampling plan for hardness, ANSI Z1.4, AQL of 0.01 may be used. Reuse of Almen C test strips is not permitted. SAE - 4 - AMS 2546 AMS 25463.3.1.2 Almen Strip Holding Fixture: Either a scrap pa
7、rt or a representative nonadjustable fixture shall be fitted with a test strip support block that conforms to SAE J442. The fixture shall be oriented in the laser peening workstation such that the Almen C test strip is at the same processing orientation as the part will see during production laser p
8、eening. This setup shall be used for all subsequent verifications as indicated in the processors work instructions for each part. 3.3.1.3 The laser shall be set to the identical processing conditions utilized for production laser peening of the parts, including beam energy density and pulse width. T
9、he same opaque overlay and transparent overlay materials shall be used for the coupon as the parts. 3.3.1.4 The Almen C test strip shall be indexed to generate a laser spot pattern. Alternatively, the Almen C strip can be held stationary and the laser beam spot can be moved to generate an equivalent
10、 laser spot pattern. The Almen test strip shall be laser peened with a pattern representative of that which is utilized during production processing in accordance with the dimensions and areas defined by the engineering drawing (see 8.2.2). 3.3.1.5 The method for measuring the arc height deflection
11、of the Almen test strips shall be in accordance with the procedures in SAE J442. The gages used for measuring the flatness and arc height of Almen test strips shall conform to the requirements of SAE J442, except that the gages shall have digital readout and have an accuracy of 0.0001 inch (0.0025 m
12、m). Almen gages shall be zeroed, at a minimum, once daily using a flat gage block. 3.3.1.6 When Almen strips are used for process verification, the arc height (deflection) shall fall within the range required by the engineering drawing. 3.3.1.7 An alternative method of verifying the setup of the las
13、er peening conditions which utilizes different parameters from those specified in 3.3.1.1, 3.3.1.2, 3.3.1.3, 3.3.1.4, 3.3.1.5, and 3.3.1.6 may be used if approved by the cognizant engineering organization. 3.3.2 Beam Spot Size and Shape: The size and geometric shape of the individual laser spots, th
14、e sequence and pattern of their application within the specified zone, and the number of distinct laser peening passes (or layers) shall be approved by the cognizant engineering organization and contained within the processors work instructions. 3.3.2.1 The method of verifying the appropriate laser
15、peening coverage (see 8.7) of the designated zone on the part (such as a visual inspection of the surface) shall be approved by the cognizant engineering organization and contained within the processors work instructions. 3.3.3 Peening Intensity: The laser beam operating parameters needed to achieve
16、 a specific laser peening intensity shall include a numeric value of the energy density (Joules/cm2) or power density (GW/cm2) and pulse width (nanoseconds) of the laser beam for each laser spot area. 3.3.3.1 The energy density (fluence) shall be determined by dividing the measurement of the pulse e
17、nergy (Joules) by the measured area (cm2) per 3.3.3.4. SAE - 5 - AMS 2546 AMS 25463.3.3.2 The power density (irradiance) shall be determined by dividing the energy density by the pulse width. 3.3.3.3 The laser pulse energy shall be measured with an energy meter or calorimeter and verified at not gre
18、ater than an annual basis. 3.3.3.4 The laser spot area shall be measured by a method that is acceptable to the cognizant engineering organization. 3.3.3.5 The pulse width shall be measured at the Full Width Half Maximum (“FWHM”) of the laser beams temporal profile. The laser pulse width shall be mea
19、sured with an appropriate fast detector and recorder traceable to national standards and verified on an annual basis. 3.3.4 Allowable Process Variation: 3.3.4.1 During production laser peening, the average laser beam energy output (in Joules) shall be within 10% of the specified energy value in the
20、processors work instructions (or an otherwise demonstrated range that is acceptable to the cognizant engineering organization.) 3.3.4.2 During production laser peening, the average laser beam pulse width (in nanoseconds) shall be within 3 nanoseconds of the specified pulse width in the processors wo
21、rk instructions (or an otherwise demonstrated range that is acceptable to the cognizant engineering organization.) 3.4 Preparation of Parts for Laser Peening: 3.4.1 Except as otherwise specified, the parts shall be within dimensional and surface finish requirements, free of grease, dirt, oil, corros
22、ion, and corrosion-preventive coatings such as anodic coating, plating, and paint prior to laser peening in the zone to be processed and in any adjacent areas to be masked. If cleaning by the processor is required, the method of cleaning shall be acceptable to the cognizant engineering organization
23、and included within the processors work instructions. 3.4.1.1 The opaque overlays required for laser peening shall be applied by the processor. 3.4.2 Except as otherwise specified, all machining of areas to be laser peened shall be completed, all fillets shall be properly formed, and all burrs and s
24、harp edges shall be removed prior to laser peening. 3.4.3 All heat treatments to meet requirements for mechanical properties shall be completed prior to laser peening. 3.4.4 When magnetic particle, fluorescent penetrant, eddy current or ultrasonic surface wave inspection is required, parts shall rec
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