【国外标准】 Standard Specification for Powder Metallurgy (PM) Titanium Alloy Structural Components (Withdrawn 2013)

This specification deals with powder metallurgy structural components fabricated from commercially pure titanium powder mixed with master alloy powder and elemental powders to yield combined material chemistries comparable to ingot metallurgy alloys Titanium 6A1-4V and Titanium 6A1-6V2Sn. The following are the materials covered: Type I and II, Grade 1 and 2, and Class A and B. The chemical composition shall conform to the required values of aluminum, vanadium, tin, iron, copper, oxygen, hydrogen, nitrogen, carbon, sodium, chlorine, silicon, and titanium. Chemical analysis shall be made. Physical properties such as density shall be determined. Mechanical properties shall conform to the required tension properties: tensile strength, yield strength, elongation and reduction of area.1.1 This specification covers powder metallurgy (PM) structural components fabricated from commercially pure (CP) titanium powder mixed with master alloy powder and elemental powders in appropriate quantity to yield combined material chemical compositions comparable to ingot metallurgy (I/M) alloys Titanium 6A1-4V and Titanium 6A1-6V-2Sn.1.2 This specification covers the following materials:1.2.1 Two types depending on alloy composition as detailed in Table 1.1.2.1.1 Type I is comparable to I/M Ti-6A1-4V.1.2.1.2 Type II is comparable to I/M Ti-6A1-6V-2Sn.1.2.2 Two grades of each type that result from the specific titanium powder used are as follows:1.2.2.1 Grade 1 is made from sponge fines with residual levels of chlorine and sodium.1.2.2.2 Grade 2 is made from hydride/dehydride (HDH) or other process titanium with significantly lower chlorine and sodium content.1.2.3 Two classes as a function of density (see Table 2) are as follows:1.2.3.1 Class A density ratio is 94 % minimum.1.2.3.2 Class B density ratio is 99 % minimum. (Warning—CP titanium powder may be pyrophoric; its use may involve an explosion hazard.)1.3 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information only.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 1.2.3.2.