Potřebujeme váš souhlas k využití jednotlivých dat, aby se vám mimo jiné mohly ukazovat informace týkající se vašich zájmů. Souhlas udělíte kliknutím na tlačítko „OK“.
Standard Test Method for Nonmetallic Inclusion Content of Ferrous Powders Intended for Powder Forging (PF) Applications
Automaticky přeložený název:
Standardní zkušební metoda pro Nekovové začleňování obsah železných prášky Určeno pro práškové Kování (PF) Aplikace
NORMA vydána dne 1.9.2014
Označení normy: ASTM B796-14
Poznámka: NEPLATNÁ
Datum vydání normy: 1.9.2014
Kód zboží: NS-8162
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: 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 | ||||
4.1 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. 4.2 The test for nonmetallic inclusions in powder forged steels is useful as the following: 4.2.1 Characteristic to classify or differentiate one grade of powder from another. 4.2.2 Means of quality comparison of powders intended for powder forging, lot to lot. 4.3 Significant variations in nonmetallic inclusion content will occur if: 4.3.1 The powder used to form the test specimen does not meet powder forging quality standards for nonmetallic inclusion content. 4.3.2 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. |
||||
1. Scope | ||||
1.1 This test method covers a metallographic method for determining the nonmetallic inclusion level of ferrous 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 μm to 15 μm. Note 1: The 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. |
||||
2. Referenced Documents | ||||
|
Chcete mít jistotu o platnosti užívaných předpisů?
Nabízíme Vám řešení, abyste mohli používat stále platné (aktuální) legislativní předpisy.
Chcete vědět více informací? Podívejte se na tuto stránku.
Poslední aktualizace: 28.04.2024 (Počet položek: 2 896 137)
© Copyright 2024 NORMSERVIS s.r.o.