Abstract

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.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

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.

TABLE 1 Chemical Composition Requirements

^A For the purpose of determining conformance with this specification, measured values shall be rounded to the nearest unit in the last right-hand digit used in expressing the specification limit, in accordance with the rounding method of Practice E 29.

^B Not applicable.

^C Various chloride levels may be available between the standard 0.20 max and the wrought equivalent of 0.001 max. The acceptable level for specific product applications shall be agreed upon between the purchaser and supplier and specified on the purchase order.

TABLE 2 Density Requirements

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

B243 Terminology of Powder Metallurgy

B311 Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Porosity

B328 Test Method for Density, Oil Content, and Interconnected Porosity of Sintered Metal Structural Parts and Oil-Impregnated Bearings

E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

Keywords

compaction; cold isostatic pressing (CIP); ELCL titanium; HDH titanium powder; hot isostatic pressing (HIP); powder metallurgy; sponge fines titanium powder; structural components; Ti-6A1-4V; Ti-6A1-6V-2Sn; titanium; titanium alloys; vacuum sinter; Powder metallurgy (P/M) materials--specifications; Structural metals/alloys--specifications; Titanium (Ti)/alloys--specifications ;

ICS Code

ICS Number Code 77.120.50 (Titanium and titanium alloys); 77.160 (Powder metallurgy)

DOI: 10.1520/B0817-08

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ASTM B817