SAE AMS 4998C pdf download

SAE AMS 4998C pdf download.Titanium Alloy Powder 6Al – 4v.
3.1.1 The plus molybdenum plus copper plus manganese shall not exceed 0.20%.
13.1.2 Sample size may be as large as 0.35 gram.
3.1.3 Determination not required for routine acceptance.
3.1.4 Check Analysis: Composition variations shall meet the requirements of AMS 2249.
3.2 Powder Production:
Powder shall be produced in lots by a suitable process in an appropriate noncontaminating atmosphere. A lot shall be all powder produced from common feed material (an ingot, billet, or cast electrode from a common ingot) in one production run of the equipment. When approved by purchaser, a lot may be the powder produced from common feed material in a series of consecutive runs in the same equipment under essentially the same fixed parameters; the powder from all such runs shall be thoroughly blended. The total weight of powder blended in one lot shall not exceed 10,000 pounds (4536 kg).
3.2.1 Ingot from which powder is made shall be produced by triple melting using consumable electrode practice: at least one of the melting cycles shall be under vacuum. The final melting may be performed during powder production when a fusion method is used to produce powder.
3.3 Condition:
As manufactured.
3.4 Properties:
The powder shall conform to the following requirements:
3.4.1 Particle Size: The particles shall pass through a No. 35 (500 pm) sieve, with not more than 5% by weight passing through a No. 325 (45 pm) sieve, determined in accordance with ASTM B 214 or other method acceptable to purchaser.
3.4.2 Powder Tap Density: When specified, shall be not less than 60% of the density value obtained in
3.4.3, determined in accordance with ASTM B 527 or other procedure acceptable to purchaser.
3.4.3 Powder Compaction and Evaluation: A sample, weighing not less than 0.75 pound (340 grams). from each powder lot shall be hot-compacted using a method which will not contaminate the powder particles during compaction. Each compacted sample shall have a density. determined in accordance with ASTM B 311, not less than 0.1594 pounds per cubic inch (4.412 Mg/rn3) and shall be divided into panels or discs totalling not less than 18 square inches (116 cm2) in area with thickness of 0.200 inch +0.015. -0.025 (5.08 mm, +0,38, -0.64). Panels shall be free of any deleterious high- or low-density inclusions, except as provided by standards agreed upon by purchaser and vendor, determined by radiographic examination in accordance with ASTM E 1742.
3.5 Quality:
The powder, as received by purchaser, shall be uniform in color and quality, dry, free from agglomerated masses, and tree from foreign materials and from imperfections detrimental to its performance during compaction or in resultant preforms or forgings.
4. QUAliTY ASSURANCE PROVISIONS:
4.1 Responsibility for Inspection:
The vendor of powder 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 powder conforms to the specified requirements.
4.2 Classification of Tests:
All technical requirements are acceptance tests and preproduction tests and shall be performed prior to or on the Initial shipment of powder to a purchaser, on each lot, when a change in ingredients and/ or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be req uired.
4.3 Sampling and Testing:
Shall be in accordance with ASTM B 215: sufficient powder shall be taken from each lot to perform all required tests in duplicate.
4.4 Approval:
4.4.1 The processes and control procedures, a preproduction sample, or both, whichever is specified, shall be approved by the cognizant engineering organization before powder for production parts is supplied.
4.4.2 The supplier shall make no significant changes to ingredients, processes, or controls from those on which the approval was based, unless the change is approved by the cognizant engineering organization. A significant change is one which, in the judgment of the cognizant engineering organization, could affect the properties or performance of the powder.
4.5 Reports:
The vendor of powder shall furnish with each shipment a report showing the results of tests for chemical composition of each heat and the oxygen and hydrogen content of each lot and stating that the powder conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS 4998C, vendors product designation, feed material, and quantity.