Low-Temperature Ion Nitriding of Austenitic Stainless Steels
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- Yasumaru Naoki
- Department of Mechanical Egineering, Fukui National College of Technology
Bibliographic Information
- Other Title
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- Low-Temperature Ion Nitriding of Austen
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Abstract
The surface nitrided layer of austenitic stainless steels ion-nitrided at a relatively low temperature of about 623 K was investigated in order to elucidate the nature of an f.c.t. nitride YN formed in this layer with high corrosion resistance and high hardness of about Hv 1500. In this layer, only YN nitride was produced and X-ray diffraction peaks of chromium nitride were not detected. The surface nitrogen concentration was found to increase with the nitriding time from about 6 to about 9.5 mass%. Furthermore, the concentration profile of nitrogen in this layer showed a monotonous decrease from the maximum value at the surface to the minimum value of about 6 mass% at the nitriding front. The tetragonal crystal structure of YN phase was recognized to be derived from the f.c.c. cell of γ′-Fe4N by an expansion in the a direction and a contraction in the c direction, according to the location of the nitrogen atoms on the centers of the four c axes.<BR>YN nitride was formed only in the low-temperature ion-nitrided layer of austenitic stainless steels of Fe–Cr–Ni, but not formed in the austenitic steels of Fe-high Ni or Fe-high Mn and in the ferritic stainless steels of Fe–Cr.
Journal
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- Materials Transactions, JIM
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Materials Transactions, JIM 39 (10), 1046-1052, 1998
The Japan Institute of Metals
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Details 詳細情報について
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- CRID
- 1390282679224757376
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- NII Article ID
- 130003556981
- 10003804362
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- NII Book ID
- AA10699969
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- COI
- 1:CAS:528:DyaK1MXnsF2g
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- ISSN
- 2432471X
- 09161821
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- NDL BIB ID
- 4587179
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
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- CiNii Articles
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- Abstract License Flag
- Disallowed