SAE J 1830-1987 Size Classification and Characteristics of Ceramic Shot for Peening《喷丸处理用陶瓷丸的尺寸分类和特性》.pdf

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5、affirmed 2013-10 Superseding J1830 MAY1987 Size Classification and Characteristics of Ceramic Shot for Peening RATIONALE J1830 has been reaffirmed to comply with the SAE five- year review policy. 1. ScopeThis specification covers characteristics for chemistry, microstructure, density, hardness, size

6、, shapeand appearance of zirconium oxide based ceramic shot, suitable for peening surfaces of parts byimpingement.2. References2.1 Applicable PublicationsThe following publication forms a part of the specification to the extent specifiedherein.2.1.1 ASTM PUBLICATIONAvailable from ASTM, 100 Barr Harb

7、or Drive, West Conshohocken, PA 19428-2959.ASTM E 11-70Specification for Wire-Cloth Sieves for Testing Purposes3. ChemistryThis specification includes the nominal chemistry of zirconium oxide based ceramic shot and theamount of free iron particles.3.1 Oxide AnalysisCeramic shot shall be manufactured

8、 from zirconium oxide and silica. The main constituentsshall be:- Zirconium Oxide 60 to 70 weight per cent- Silica 28 to 33 weight per cent- Alumina less than 10 weight per centThe total of other constituent contents shall not exceed 3 weight per cent. Analysis method is X-RayFluorescence or any oth

9、er method acceptable to purchaser.3.2 Free Iron ContentThe free iron content of the ceramic shot sample shall not exceed 0.10 weight per cent. Itis determined by slowly sprinkling 500 g of the sample ceramic bead shot on an inclined aluminum tray that is1.6 mm (0.062 in) deep by 152 mm (6 in) wide b

10、y 305 mm (12 in) long. The tray is supported by anonmagnetic frame so that it is inclined with a 152 mm (6 in) rise from end to end, (30 degrees from horizontal).Four 25 x 25 x 152 mm (1 x 1 x 6 in) bar magnets are positioned against the under surface and crosswise tothe inclined tray about the midd

11、le of its length. Magnets shall be not less than 10 000 Gauss magnetic fieldeach and arranged so that the magnetic north and south poles alternate. The magnetic particles (iron) thataccumulate on the tray as the beads roll down are carefully brushed into a preweighed dish. The procedure isrepeated w

12、ith the same 500 g sample until all visible magnetic particles are collected. The dish is thenreweighed and the magnetic particle content is calculated as a percentage of the total original sample.4. MicrostructureCeramic shot are manufactured by electric fusion of oxides to form a closely bonded in

13、ternalstructure of a crystalline zirconia phase within an amorphous silica phase.5. Specific GravityThis characteristic is closely related to chemical analysis. It ranges between 3.60 and3.95 g/cm3.Specific gravity is measured at 31 C by a pycnometric method.6. HardnessUnless otherwise specified, th

14、e ceramic shot shall have the following hardness:623-785 DPH (1Kgf)or 660-812 KHN (500 gf)(for reference only approximately 5763 HRC)7. SizeUnless otherwise specified, the ceramic shot shall conform to Table I.7.1 TestingThis is conducted by screening a 250 g sample with sieves conforming to ASTM E

15、1170.8. ShapeSphericity and roundness are measured by an actual counting of a one layer field of a minimum of200 ceramic beads, at a magnification of 20X.8.1 SphericityIt refers to the ratio of short to long axes of the hypothetical ellipse that would contain the actualimage of the ceramic bead as s

16、een through a microscope. Unless otherwise specified, Table I gives themaximal number of ceramic shot having a sphericity less than 0.5 and the minimum percentage of ceramicshot having a sphericity of 0.8 and greater.8.2 RoundnessIt refers to the relative angularity of grain corners, the ceramic sho

17、t having round and smoothsurfaces. Scored, broken or angular particles are those that would present sharp or angular surfaces whenimpacted, causing metal removal or unsatisfactory or irregular finishes. An actual count shall be made of afield of 1 cm2at a 20X magnification. Maximum number of permiss

18、able broken or angular beads is shown oncolumn 11 of Table I. This number shall never exceed 3%.9. AppearanceCeramic shot is constant in color, free flowing, free of defects and free of foreign matter.10. Quality AssuranceCeramic shot quality is checked by lots of 1,000 kg maximum. A representative

19、sampleof the shipped lot shall be tested for conformance to all requirements of this specification. Lot number and thisspecification number shall be marked on each container unit. All control data will be available frommanufacturer on request for two (2) years after shipment._ SAE INTERNATIONAL J183

20、0 Reaffirmed OCT2013 Page 2 of 3PREPARED BY THE SAE MECHANICAL PRESTRESSING TASK FORCETABLE 1CERAMIC SHOT FOR PEENING - SIZES(7)(8)DESIGNATIONNOMINAL SIZESSIEVE SIZE (mm)MIN %OF SHOTW/ SPHERICITY0.8 & ABOVEMAX NO.OF BEADS PERSQUARE CM. WITHSPHERICITY BELOW 0.5MAX NO. BROKENOR ANGULARBEADS PERSQUARE

21、CM.MMINMESHMAX 0.5%RETAINSMAX 5%RETAINSMAX 10%PASSMAX 3%PASSZ 8500.850/1.1800.033/0.04616/201.4001.1800.8500.7106542Z 6000.600/0.8500.024/0.03320/301.0000.8500.6000.4256584Z 4250.425/0.6000.017/0.02430/400.7100.6000.4250.30070148Z 3000.300/0.4250.011/0.01740/500.5000.4250.3000.250702715Z 2100.210/0.3000.008/0.01150/700.3550.3000.2120.180804520Z 1500.150/0.2100.006/0.00870/1000.2500.2120.1500.1258030065_ SAE INTERNATIONAL J1830 Reaffirmed OCT2013 Page of 33