We need your consent to use the individual data so that you can see information about your interests, among other things. Click "OK" to give your consent.
Standard Test Method for Nonmetallic Inclusion Content of Powders Intended for Powder Forging (PF) Applications
STANDARD published on 1.10.2007
Designation standards: ASTM B796-07
Note: WITHDRAWN
Publication date standards: 1.10.2007
SKU: NS-8161
The number of pages: 3
Approximate weight : 9 g (0.02 lbs)
Country: American technical standard
Category: Technical standards 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. |
||||
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. |
||||
2. Referenced Documents | ||||
|
Do you want to make sure you use only the valid technical standards?
We can offer you a solution which will provide you a monthly overview concerning the updating of standards which you use.
Would you like to know more? Look at this page.
Latest update: 2024-12-22 (Number of items: 2 217 000)
© Copyright 2024 NORMSERVIS s.r.o.