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File:Section of carburized steel.png

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Description
English: A micrograph of a section of carburized steel. The magnification is 200x. According to the scouse of this photograph, the original steel is a low carbon steel including 0.2% C, 0.24% Si, 0.52% Mn, 0.46% Ni, and 0.17%Cr. The black portions of the photograph is pearlite that was made by carburizing. The white portions are ferrite. Being exposed to the mixture of 70% charcoal and 30% barium carbonate, the steel was kept at 930 degrees C, then was cooled in furnace.
Date
Source 吉岡正三「金属組織学」コロナ社、1953年10月25日、p. 324
Author 吉岡正三、加藤

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Public domain
This photograph is in the public domain in Japan because its copyright has expired according to Article 23 of the 1899 Copyright Act of Japan (English translation) and Article 2 of Supplemental Provisions of Copyright Act of 1970. This is when the photograph meets one of the following conditions:
  1. It was published before 1 January 1957.
  2. It was photographed before 1 January 1947.
It is also in the public domain in the United States because its copyright in Japan expired by 1970 and was not restored by the Uruguay Round Agreements Act.
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To uploader: Please provide the source and publication date.
  • If the photograph was also published in the United States within 30 days after publication in Japan, it might be copyrighted. If the copyright has not expired in the U.S, this file will be deleted. See Commons:Hirtle chart.
  • This template should not be used for a faithful photographic reproduction of an artwork. Under Article 23 of the former Copyright Act, its protection will be consistent with the artwork. See also Commons:When to use the PD-Art tag.

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current10:52, 2 March 2019Thumbnail for version as of 10:52, 2 March 20191,470 × 1,760 (7.42 MB)Yapparina (talk | contribs)User created page with UploadWizard

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