SAE AMS 4990 pdf download

SAE AMS 4990 pdf download.Titanium Alloy Sheet,Strip, and Plate 6Al-6V-2Sn Solution Heat Treated and Aged.
1.1 Form:
This specification covers a titanium alloy in the fomi of sheet, strip, and plate.
1.2 Application:
This material is typically used for parts requiring high strength-to-weight ratio and stability up to 550 °F (288 C), but usage is not limited to such applications.
1.3 Certain processing procedures and service conditions may cause these products to become subject to stress-corrosion cracking; AR P982 recommends practices to minimize such conditions.
2. APPLICABLE DOCUMENTS:
The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been canceled and no superseding document has been specified, the last published issue of that document shall apply.
2.1 SAE Publications:
Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org.
AMS 2242 Tolerances, Corrosion and Heat Resistant Steel. Iron Alloy, Titanium, and Titanium Alloy Sheet, Strip, and Plate
AMS 2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS 2631 Ultrasonic Inspection of Titanium Alloys
3.5.21 Equiaxed and/or elongated primary alpha In a transformed beta matrix with no continuous network of alpha at prior beta grain boundaries.
35.22 Essentially complete field of equiaxed and/or elongated alpha with or without intergranular beta and with no continuous network of alpha at prior beta grain boundaries.
3.5.2.3 A microstructure showing a continuous network of alpha in prior beta grain boundaries is not acceptable.
3.5.3 Surface Contamination: The product shall be free of any oxygen-cich layer, such as alpha case, or other surface contamination, determined as in 3.5.3.1 or 3.5.3.2, or other method acceptable to purchaser.
3.5.3.1 Microscopic examination at 400X minimum
3.5.3.2 Hardness difference; a surface hardness more than 40 points higher than the subsurface hardness, determined in accordance with ASTM E 384 on the Knoop scale using a 200 gram load, being evidence of unacceptable surface contamination.
3,5.4 Average Grain Size: Shall be ASTM No. 6 or finer determined by comparison of a polished and etched specimen with the chart in ASTM E 112.
3.6 Quality:
The product, as received by purchaser, shall be uniform in quality and condition. sound, and free from soil cans (See 8.4) of depth in excess of the flatness tolerances, ripples, and foreign materials and from imperfections detrimental to usage of the product.
3.6.1 Ultrasonic Inspection: Plate 0.500 to 4.000 inch (12.70 to 101.60 mm) In nominal thickness shall meet Class Al requirements of AMS 2631.
3,7 Tolerances:
Shall conform to all applicable requirements of AMS 2242.
4. QUALITY ASSURANCE PROVISIONS:
4.1 Responsibil,ty for Inspection:
The vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all required tests Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to the specified requirements.
4.2 Classification of Tests:
Tests for all technical requirements are acceptance tests and shall be performed on each heat or lot as applicable,
4,3 Sampling and Testing:
Shall be in accordance with the following: a lot shall be all product of the same nominal size from the same heat processed at the same time and in the same heat treatment batch.
4.3.1 Composition: One sample from each heat, except that for hydrogen determinations one sample from each lot obtained after thermal and chemical processing is completed.
4.3.2 Tensile Properties, Microstructure, Surface Contamination, and Average Grain Size:
At least one sample from each lot
4,3.2.1 Specimens for tensile tests of widths 9 inches (229 mm) and over shall be taken in both the longitudinal and transverse directions: for widths under 9 inches (229 mm), specimens shall be taken in the longitudinal direction.
4,4 Reports:
The vendor of the product shall furnish with each shipment a report showing the results of tests for composition of each heat and for the hydrogen content, tensile and average grain size, and surface contamination of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers. AMS 4990, size, and quantity.
4.5 Resamphng and Retesting::
If any specimen used in the above tests fails to meet the speciñed requirements, disposition of the product may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the product represented. Results of all tests shall be reported.