Observations of prior austenite grain boundaries and carbides in the same area of tempered martensite in medium-carbon steel by atomic force microscopy

M. Hayakawa, S. Matsuoka, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Microstructures of JIS-SCM440 steel tempered at 723 K were observed on an electropolished and a picric-acid etched surfaces by atomic force microscopy (AFM). At first, AFM image was taken on an electropolished surface. Carbides and blocks were clearly distinguished on the image, because the electropolishing rate depends on the crystal phase and its surface orientation. However, prior austenite grain boundaries could not be completely recognized. Secondly, AFM image was taken in the same area on a picric-acid etched surface. Prior austenite grain boundaries were observed, because the boundaries are preferentially etched. Thirdly, the both of AFM images were overlapped. This procedure gave us AFM image where prior austenite grain boundaries as well as carbides and blocks were clearly recognized. Finally, number and sizes of the carbides along prior austenite grain boundaries were examined.

Original languageEnglish
Pages (from-to)734-741
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume65
Issue number8
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

Fingerprint

carbon steels
austenite
martensite
Martensite
carbides
Austenite
Carbon steel
Carbides
Atomic force microscopy
Grain boundaries
grain boundaries
atomic force microscopy
electropolishing
Electrolytic polishing
acids
Acids
Steel
Crystal orientation
steels
Crystals

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "Microstructures of JIS-SCM440 steel tempered at 723 K were observed on an electropolished and a picric-acid etched surfaces by atomic force microscopy (AFM). At first, AFM image was taken on an electropolished surface. Carbides and blocks were clearly distinguished on the image, because the electropolishing rate depends on the crystal phase and its surface orientation. However, prior austenite grain boundaries could not be completely recognized. Secondly, AFM image was taken in the same area on a picric-acid etched surface. Prior austenite grain boundaries were observed, because the boundaries are preferentially etched. Thirdly, the both of AFM images were overlapped. This procedure gave us AFM image where prior austenite grain boundaries as well as carbides and blocks were clearly recognized. Finally, number and sizes of the carbides along prior austenite grain boundaries were examined.",
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