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SAE ARP1820C

Name: SAE ARP1820C PDF | Request Standard
SKU: 74d8988778ae

Chord Method of Evaluating Surface Microstructural Characteristics

Standard by SAE International, 2021-05-19

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Language: English
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About This Item

This practice provides a method for evaluating microhardness and microstructure very close (0.002 inch (0.051 mm) or less) to the surface of a disk specimen. Specific accept/reject criteria for partial decarburization (3.7.1), inadvertent carburization/nitriding (3.7.3), total decarburization/intergranular oxidation (3.8), and other characteristics evaluated are to be found in the applicable specification where this ARP is referenced. ARP1820C results from a Five-Year Review and update of this specification with rewritten Introduction and Scope to add clarity, disc surface texture changed from 32 to 18 as it was more desirable but that higher texture may be needed for smaller diameters (3.1), added ASTM E385 for determining Knoop microhardness and allowed for staggered indentations (3.5), changed hardness for Depth of Decarburization to be consistent with AMS2759 (3.6), added clarifying wording for Inadvertent Carburization and Nitriding (3.7.2), and Figures 2, 3, and 4 were replaced with more accurate figures.

SKU: 74d8988778ae

Publication Date: 2021-05-19

Standard Status: latest

Publisher: SAE International

Document Type: Aerospace Standard

Subject: Corrosion resistant alloys, Steel, Heat treatment, Coatings, colorants, and finishes, Production control, Quality assurance, Metallurgy, Fabrication, Cutting

Official SAE: Doi link

This Version: ARP1820C (2021-05-19)
Previous Version: ARP1820B (2012-04-05)
Previous Version: ARP1820A (2002-12-20)
Previous Version: ARP1820 (1984-10-01)

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