鉄-炭素合金焼入れおよび焼戻しマルテンサイトの電子顕微鏡による研究

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  • Electron Microscope Study of Quenched and Tempered Martensite in Fe-C Alloys
  • テツ-タンソ ゴウキン ヤキイレ オヨビ ヤキモドシ マルテンサイト ノ デンシ ケンビキョウ ニ ヨル ケンキュウ

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The fine structure of martensite in plain carbon steels has been studied by transmission electron microscopy. In a 0.17%C steel most of martensites are free from internal twins but with dislocations of high density. While in a 0.87%C steel, the plate-like grain of martensite consists of fine internal twin bands together with dislocations of high density.<BR>As regards the fine structure of the martensite tempered up to 300°C the main differences result from the substructure existing in the martensite state. In the 0.17%C steel, during tempering at 150°C, carbon atoms segregate around the dislocations and tiny metastable carbides precipitate in situ. With the increase of the tempering temperature up to 300°C the precipitation proceeds in the usual manner, producing a Widmanstätten arrangement of cementite. In the 0.87%C steel carbides precipitate along the twins by tempering at 150°C for 1 hour and by increasing the tempering time the other carbides can also be seen across the twins. At this stage, they were identified as ε-carbides by selected area electron diffraction. At high tempering temperatures the carbide was found to be cementite, the orientation relationships being<BR>(This article is not displayable. Please see full text pdf.) <BR>The first of these is in agreement with the work of Pitsch and Schrader but the second is different from it.

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  • 日本金属学会誌

    日本金属学会誌 28 (8), 471-476, 1964

    公益社団法人 日本金属学会

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