ASTM B817-98
(Specification)Standard Specification for Powder Metallurgy (P/M) Titanium Alloy Structural Components
Standard Specification for Powder Metallurgy (P/M) Titanium Alloy Structural Components
SCOPE
1.1 This specification covers powder metallurgy (P/M) structural components fabricated from commercially pure (CP) titanium powder blended with master alloy powder and minor elemental powders in appropriate quantity to yield combined material chemistries comparable to ingot metallurgy (I/M) alloys Titanium 6A1-4V and Titanium 6A16V-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 contains sponge fines with residual levels of chlorine and sodium.
1.2.2.2 Grade 2 contains 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. Note 1-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 problems, 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 Note 1.
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Designation: B 817 – 98
Standard Specification for
Powder Metallurgy (P/M) Titanium Alloy Structural
Components
This standard is issued under the fixed designation B 817; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This specification covers powder metallurgy (P/M) 2.1 ASTM Standards:
structural components fabricated from commercially pure (CP) B 243 Terminology of Powder Metallurgy
titanium powder mixed with master alloy powder and minor B 311 Test Method for Density Determination for Powder
elemental powders in appropriate quantity to yield combined Metallurgy (P/M) Materials Containing Less Than Two
material chemistries comparable to ingot metallurgy (I/M) Percent Porosity
alloys Titanium 6A1-4V and Titanium 6A1-6V-2Sn. B 328 Test Methods for Density, Oil Content, and Intercon-
1.2 This specification covers the following materials: nected Porosity of Sintered Powder Metal Structural Parts
1.2.1 Two types depending on alloy composition as detailed and Oil-Impregnated Bearings
in Table 1. E 8 Test Methods for Tension Testing of Metallic Materials
1.2.1.1 Type I is comparable to I/M Ti-6A1-4V.
3. Terminology
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 3.1 Definitions—Definitions of powder metallurgy terms
can be found in Terminology B 243.
titanium powder used are as follows:
1.2.2.1 Grade 1 is made from sponge fines with residual 3.2 Descriptions of Terms Specific to This Standard—
Additional descriptive information is available in the Related
levels of chlorine and sodium.
1.2.2.2 Grade 2 is made from hydride/dehydride (HDH) or Material section of Volume 02.05 of the Annual Book of ASTM
Standards.
other process titanium with significantly lower chlorine and
sodium content.
4. Ordering Information
1.2.3 Two classes as a function of density (see Table 2) are
4.1 Orders for components under this specification shall
as follows:
include the following information:
1.2.3.1 Class A density ratio is 94 % minimum.
4.1.1 Dimensions (see Section 9),
1.2.3.2 Class B density ratio is 99 % minimum.
4.1.2 Chemical composition (see Section 6 and Table 1),
NOTE 1—Warning: CP titanium powder may be pyrophoric; its use
4.1.3 Density (see 7.1 and Table 2),
may involve an explosion hazard.
4.1.4 Mechanical properties (see Section 8 and Table X1.1),
1.3 The values stated in inch-pound units are to be regarded
and
as the standard. The SI units given in parentheses are for
4.1.5 Certification (see Section 13).
information only.
1.4 This standard does not purport to address all of the 5. Materials and Manufacture
safety concerns, if any, associated with its use. It is the
5.1 Structural components shall be fabricated by cold com-
responsibility of the user of this standard to establish appro-
pacting a mixture of CP titanium, master alloy, and other
priate safety and health practices and determine the applica-
elemental powders into suitable shapes. The compacts shall be
bility of regulatory limitations prior to use. Specific precau-
vacuum sintered and hot isostatically pressed, if necessary, to
tionary statements are given in Note 1.
provide parts conforming to the requirements of this specifi-
cation.
This specification is under the jurisdiction of ASTM Committee B-9 on Metal
Powders and Metal Powder Productsand is the direct responsibility of Subcommit-
tee B09.11on Near Full Density Powder Metallurgy Materials.
Current edition approved Oct. 10, 1998. Published December 1998. Originally Annual Book of ASTM Standards, Vol 02.05.
published as B 817 – 91. Last previous edition B 817 – 93 (1997). Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 817–98
TABLE 1 Chemical Requirements
purchaser. All shipments of components subsequent to the
Element Composition, Weight % establishment of testing conditions shall conform to the agreed
limits.
Grade 1 Grade 2
Type I Type II Type I Type II
9. Dimensions and Tolerances
Aluminum 5.50/6.75 5.0/6.0 5.50/6.75 5.0/6.0
9.1 Dimensions and tolerances of the structural components
Vanadium 3.50/4.50 5.0/6.0 3.50/4.50 5.0/6.0
A A
shall be indicated on drawings accompanying the purchase
Tin N/A 1.5/2.5 N/A 1.5/2.5
Iron 0.40 max 0.35/1.0 0.40 max 0.35/1.0
order or contract.
A A
Copper N/A 0.35/1.0 N/A 0.35/1.0
Oxygen, max 0.30 0.30 0.30 0.30
10. Sampling
Hydrogen, max 0.015 0.015 0.015 0.015
10.1 Lot—Unless otherwise specified, a lot shall consist of
Nitrogen, max 0.04 0.04 0.04 0.04
Carbon, max 0.10 0.10 0.10 0.10
components fabricated from powder of the same mix lot;
B B
Sodium, max 0.20 0.20 TBD TBD
B B compacted, sintered (and hot isostatically pressed, if required)
Chlorine, max 0.20 0.20 TBD TBD
Silicon, max 0.10 0.10 0.10 0.10 under the same conditions.
Residual elements 0.10 0.10 0.10 0.10
10.2 Chemical Analysis—If required by purchase agree-
each, max
ment, at least one sample for chemical analysis shall be taken
Residual elements 0.40 0.40 0.40 0.40
total, max from each lot. A representative sample of chips may be
Titanium remainder remainder remainder remainder
obtained by dry-milling, drilling or crushing at least two pieces
A
Not applicable.
without lubrication using clean, dry tools.
B
Various chloride levels may be available between the standard 0.20 max and
10.3 Mechanical Testing—If required by purchase agree-
the wrought equivalent of 0.001 max. The acceptable level for specific product
ment, the manufacturer and purchaser shall mutually agree on
applications shall be agreed upon between the purchaser and supplier and
specified on the purchase order.
the representative number of specimens for mechanical testing,
from each lot.
TABLE 2 Density Requirements
11. Inspection
Class Density Ratio min, %
11.1 Unless otherwise specified, inspection of components
A94
supplied on contract shall be made by the purchaser.
B99
12. Rejection and Rehearing
12.1 Components that fail to conform to the requireme
...
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