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Standard Test Method for Nonmetallic Inclusion Content of Powders Intended for Powder Forging (PF) Applications
Automaticky preložený názov:
Štandardná skúšobná metóda pre nekovové začleňovania Obsah prášky Určené pre Powder Kovanie ( PF ) Aplikácia
NORMA vydaná dňa 1.10.2007
Označenie normy: ASTM B796-07
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.10.2007
Kód tovaru: NS-8161
Počet strán: 3
Približná hmotnosť: 9 g (0.02 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
nonmetallic inclusions, powder forged (PF) steel parts, ICS Number Code 77.040.99 (Other methods of testing metals)
Significance and Use | ||||
The extensive porosity present in pressed and sintered ferrous materials masks the effect of inclusions on mechanical properties. In contrast, the properties of material powder forged to near full density are strongly influenced by the composition, size, size distribution, and location of nonmetallic inclusions. The test for nonmetallic inclusions in powder forged steels is useful as the following: Characteristic to classify or differentiate one grade of powder from another. Means of quality comparison of powders intended for powder forging, lot to lot. Significant variations in nonmetallic inclusion content will occur if: The powder used to form the test specimen does not meet powder forging quality standards for nonmetallic inclusion content. Processing of the powder forged test specimen has been carried out under conditions that do not permit oxide reduction or allow oxidation of the test specimen, or both. |
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1. Scope | ||||
1.1 This test method covers a metallographic method for determining the nonmetallic inclusion level of powders intended for powder forging (PF) applications. 1.2 The test method covers repress powder forged test specimens in which there has been minimal lateral material flow ( 1%). The core region of the powder forged test specimen shall contain no porosity detectable at 100. 1.3 This test method is not suitable for determining the nonmetallic inclusion level of powder forged test specimens that have been forged such that the core region contains porosity. At the magnification used for this test method residual porosity is hard to distinguish from oxide inclusions. Too much residual porosity makes a meaningful assessment of the inclusion population impossible. 1.4 The test method may be applied to materials that contain manganese sulfide (admixed or prealloyed) provided the near neighbor separation distance is changed from 30 m to 15 m. Note 1The test method may be applied to powder forged parts where there has been a greater amount of material flow provided: The near neighbor separation distance is changed, or The inclusion sizes agreed between the parties are adjusted for the amount of material flow. 1.5 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. |
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2. Referenced Documents | ||||
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