SAE AMS 7908A pdf download
SAE AMS 7908A pdf download.Beryllium Hipped Near-Net Preforms Standard Grade.
1.1 Form:
This specification covers beryllium in the form of bar, rod, tubing, and shapes fabricated fromberyllium powder consolidated by hot isostatic pressing (HIP).
1.2Application:
This product has been used typically for parts requiring high strength-to-weight ratio and highmodulus of elasticity, but usage is not limited to such applications.
1.3Safety – Hazardous Materials:
While the materials, methods, applications and processes described or referenced in this
specification may involve the use of hazardous materials, this specification does not address thehazards which may be involved in such use. lt is the sole responsibility of the user to ensurefamiliarity with the safe and proper use of any hazardous materials and to take necessaryprecautionary measures to ensure the health and safety of all personnel involved.
1.3.1 WARNING: Beryllium Product: Inhalation of dust or fumes may cause serious chronic lung
disease. Potential cancer hazard is based principally on animal tests.
2. APPLICABLE DOCUMENTS:
The issue of the following documents in effect on the date of the purchase order forms a part of thisspecification to the extent specified herein.The supplier may work to a subsequent revision of adocument unless a specific document issue is specified. When the referenced document has beencanceled and no superseding document has been specified, the last published issue of that documentshall apply.
3,4.1.3 Thermally Induced Porosity (TIP) Resistance:
3.4.1.3.1 Sample product shall be subjected to a TIP test consisting of a heat treatment in inert atmosphere or under vacuum at 1454) °F (788 °C) for one hour.
3.4.1.3.2 The minimum density allowed following the TIP heat treatment shall be 99.0% of the theoretical density, calculated as shown in 3.4.1.2.1. The maximum drop in the density due to the TIP resistance test shall be 0.20%.
3,4.1.4 Radiographic Inspection: Radiographic inspection to a penetrameter sensitivity of 2% shall be performed in accordance with ASTM E 1742: however, exceptions are taken to the penetrameter contrast requirement and applicable area of penetrameter density ranges of +30% or -15% from the density at penetrameter location(s).
3.4.1.4.1 Radiographic indications (voids or inclusions) shall confom’i to the following requirements:
3.4.1.4.1.1 Maximum Dimension of any Indication: Any dimension of any indication, measured in the plane of the radiograph, shall not exceed 0.050 inch (1.27 mm).
3.4.1.4.1.2 Maximum Average Dimension of any Indication: The average dimension of any indication shall be the arithmetic average of the maximum and minimum dimensions, measured In the plane of the radiograph, and shall not exceed 0.030 inch (0.76 mm).
3.4.1.4.1.3 Total Combined Volume Per Cubic Inch (16.4 cm3) of All Indications: The total combined volume per cubic inch (16.4 cm3) of all detectable radiographic indications shall not exceed the volume of a 0.050 inch (1.27 mm) diameter sphere (e.g., total spherical volume shall not exceed 6.5 x 10 in3 [1.07 mm3]). For calculation purposes, assume all indications are spherical.
3.4.1.4.1.4 Part Density Uniformity: The terms variable density areas, banding, or stnations denote relatively large areas of a radiograph, which vary in density as compared to the surrounding area. These areas shall not vary in radiographic density by more than 5% as compared to the surrounding area of comparable section thickness. Suspect areas shall be reradiographed and interpreted with the appropriate penetrameter or beryllium of 5% in thickness placed as follows:
a. Less dense (darker radiograph) areas shall be covered by the penetrameter. The radiograph of the covered area shall appear lighter than that of the adjacent area.
b. More dense (lighter radiograph) areas shall have the penetrameter placed immediately adjacent to them. The radiograph of the covered area shall appear lighter than that of the suspect more-dense area.
3.4.1.4.1.5 Discrete high density (light radiograph) indications, or areas in product 1.000 inch (25.40 mm) and under In nominal thickness, which are 5% or less in radiographic density variation compared to the surrounding material, are acceptable.
