1、.beMIL-T-81556A#JIENDMENT126 September 1996MILITARY SPECIFICATIONTITANIUM ANDTITANIUM ALLOYS, EXTRUDED8ARSANDSWAPESAIRCRAFT QUALITYThis amendment forms a part of MIL-T-81556A, dated 31 January 1983. andis approved for use by all Departments and Agencies of the Department ofDefense.PAGE 22.1.1: Add t
2、he following,after MIL-STD-410:“MIL-STD-2154 -3.7: Add the following“and table Vs.”INSPECTION,ULTRASONIC,PAGE 4to the end of the sentence:WROUGWT METALS. PROCESS FOR”3.10: Delete and substitute3.10a and 3.10b as follows:“a. The surface shall be free of contamination from oxygen (alphacase). hydrogen
3、, nitrogen, or other surface contaminationdetermined in accordancewith 4.4.2.2. When permitted by thecontracting agency, extrusionstiich will be machined all over mayhave an oxygen rich layer, 0.007 inch maximum. provided that sucha layer is removablewithin the machining allowance.b. The depth of su
4、rface imperfections(laps. die lines. dents.gouges, etc.) shall be containedwithin the dimensional tolerancesand shall not extend beyond the minimum section thickness allcrdper table VI.-Msc WA lofs FSC 9S40DistributionStatement A: Approved for public release: distribution is unlimited.Provided by IH
5、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-81556AAMENDMENT 1PAGE 53.12: Delete and subsitute:“3.12 Workmanship. The product, when visually examined (see 4.4.1).shall be uniform in quality and condition. sound, and free from cracks.seams, foreign materia
6、ls and other defects detrimental to thefabrication or performance of arts.YIn addition, visual examination oftransverse cross sections shal show no pipe or cracks: and shall showno segregation determined in accordancewith 4,4.2.1. (See 3.10 forrequirements regarding surface contamination.)”PAGE 64.4
7、.4.2: Delete and substitute:“4.4.4.2 Inspectionof billets. Ultrasonic inspectionof billets maybe performed in lieu of ultrasonic inspectionof extruded product. Thesurface roughness shall not exceed 250 Ra. The billets shall conform to a71the ultrasonic quality requirementsof 3.7.”4.4.4.3: Delete and
8、 substitute:“4.4,4,3 Inspectionof extruded Droduct, Ultrasonic inspection ofextruded product shall only be required if the billet has not beenultrasonically inspected. Ultrasonic inspectionshall be applicable forextruded product 0.500 inch, or greater, in section thickness and asurface roughness no
9、greater than 250 Ra. The extruded product shallconform to the ultrasonic quality requirementsof 3.7.”Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-81556AAMENDMENT 1PAGE 17Table V: Delete and substitutewith the followingtwo tables:Table V. Ult
10、rasonicQuality of extruded t)roduct.Specified diameter - rodSpecified thickness - bar Ultrasonic class /Specified thickness - shape0.500 - 1.500 inches AA1.501 - 7.00 inches Al7.01 inches and greater A49 / Classification is inaccordance with AMS 2631 (Grade 1 if double meltedand Grade 2 if triple me
11、lted).Table Va. Ultrasonicauality of billets.PME 18Table VI: In the first table at the tap of the age. which contains theRthickness tolerance,delete the fourt column entitled “Allowabledepth of surface defects, inch”.Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
12、e from IHS-,-,-MIL-T-81556AAMENDMENT 1PAGE 21Table VIII: Delete and substitute:Table VIII. Mechanical r)roDertvspecimen requirements (see 4.4.7.1).orm Thickness, dia- Configuration Test locationmeter or dis- Lf and directiontance between 4/flats (inches)Iound, square. 0.187 - 1.500 Dl, D2, D30r Cent
13、er of crossand hexagonal D4 1)arsection1.501 and over 01. D2, D3 Midway betweenthe center andsurface of thecross-sectionRectangular 0.187 - 0.375 F2 JI Full Thicknessbar 510.376 and over Dl, D2, orD3 Midway betweenthe center andsurface of thecross-sectionDther Shapes Unless otherwise specified (see
14、6.2.1), tensionspecimens shall be taken from the center of the crosssection of the redominant area or thickest portion ofRproduct using t e round specimens per nOte U forproduct 1.500 inches and under in thickness. Fullthickness rectangular specimens per note 3/may be usedfor product 0.375 inch or l
15、ess in thickness. Tensilespecimens shall be taken midway between the center andsurface for product over 1.500 inches in thickness.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-fMIL-T-81556AAMENDMENT 1Notes for table VII I,.51Configurations shown ar
16、e for tension specimens. Compression specimensshall conform to the requirementsof ASTM E 9.01, D2. D3. and D4 designates s ecimens correspondingto round tensionspecimens as specified in ASTM ! 8 for 0.500.0.350.0.250, and 0.160inch nominal diameters in the reduced test section. respectively. Incase
17、of a dispute. the results obtained from testin the largest?possible diameter of these four specimen sizes shal govern.F2 designates standard sheet type type specimenswith a 1/2 inch widthreduced test section as specifed in ASTM E 8 for rectangulartensionspecimens.Unless otherwise specified (see 6.2.
18、1). the longitudinalaxis of thetension specimens shall be parallel to the extruding direction and shallcoincide with the specified test locationwithin a radius of 1/16 inch.Machining the specimen thickness shall be permitted if it is limited tothe removal of surface imperfectionsand surface contamination (see3.10).Custodians: Preparing ActivityArmy - MR Navy - ASNavy - ASAir Force - 11 (Project9540-0160)Review Activities:Army - AR, MINavy - OS, SHfli y - 99, 845Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
