Comparison of microstructure and hardness between high-carbon and high-nitrogen martensites

Toshihiro Tsuchiyama; Kurato Inoue; Katsutoshi Hyodo; Daichi Akama; Nobuo Nakada; Setsuo Takaki; Tamotsu Koyano

doi:10.2355/isijinternational.ISIJINT-2018-404

Comparison of microstructure and hardness between high-carbon and high-nitrogen martensites

Toshihiro Tsuchiyama, Kurato Inoue, Katsutoshi Hyodo, Daichi Akama, Nobuo Nakada, Setsuo Takaki, Tamotsu Koyano

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

The microstructure and hardness of martensite in Fe-C and Fe-N alloys with up to 7.5 at% contents of carbon and nitrogen, respectively, were compared. Their difference in hardness was discussed based on four strengthening mechanisms. The martensitic structures of Fe-C and Fe-N alloys with equal contents of carbon and nitrogen, respectively, were nearly identical, except for the amount of retained austenite. Furthermore, Fe-C alloy was considerably harder than Fe-N alloy. This discrepancy gradually increased with carbon and nitrogen contents. The enhanced hardness of Fe-C alloy martensite was attributed to its higher dislocation density and the stronger pinning force of interstitial carbon atoms on dislocations.

Original language	English
Pages (from-to)	161-168
Number of pages	8
Journal	isij international
Volume	59
DOIs	https://doi.org/10.2355/isijinternational.ISIJINT-2018-404
Publication status	Published - Jan 2019

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.2355/isijinternational.ISIJINT-2018-404

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title = "Comparison of microstructure and hardness between high-carbon and high-nitrogen martensites",

abstract = "The microstructure and hardness of martensite in Fe-C and Fe-N alloys with up to 7.5 at% contents of carbon and nitrogen, respectively, were compared. Their difference in hardness was discussed based on four strengthening mechanisms. The martensitic structures of Fe-C and Fe-N alloys with equal contents of carbon and nitrogen, respectively, were nearly identical, except for the amount of retained austenite. Furthermore, Fe-C alloy was considerably harder than Fe-N alloy. This discrepancy gradually increased with carbon and nitrogen contents. The enhanced hardness of Fe-C alloy martensite was attributed to its higher dislocation density and the stronger pinning force of interstitial carbon atoms on dislocations.",

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T1 - Comparison of microstructure and hardness between high-carbon and high-nitrogen martensites

AU - Tsuchiyama, Toshihiro

AU - Inoue, Kurato

AU - Hyodo, Katsutoshi

AU - Akama, Daichi

AU - Nakada, Nobuo

AU - Takaki, Setsuo

AU - Koyano, Tamotsu

PY - 2019/1

Y1 - 2019/1

N2 - The microstructure and hardness of martensite in Fe-C and Fe-N alloys with up to 7.5 at% contents of carbon and nitrogen, respectively, were compared. Their difference in hardness was discussed based on four strengthening mechanisms. The martensitic structures of Fe-C and Fe-N alloys with equal contents of carbon and nitrogen, respectively, were nearly identical, except for the amount of retained austenite. Furthermore, Fe-C alloy was considerably harder than Fe-N alloy. This discrepancy gradually increased with carbon and nitrogen contents. The enhanced hardness of Fe-C alloy martensite was attributed to its higher dislocation density and the stronger pinning force of interstitial carbon atoms on dislocations.

AB - The microstructure and hardness of martensite in Fe-C and Fe-N alloys with up to 7.5 at% contents of carbon and nitrogen, respectively, were compared. Their difference in hardness was discussed based on four strengthening mechanisms. The martensitic structures of Fe-C and Fe-N alloys with equal contents of carbon and nitrogen, respectively, were nearly identical, except for the amount of retained austenite. Furthermore, Fe-C alloy was considerably harder than Fe-N alloy. This discrepancy gradually increased with carbon and nitrogen contents. The enhanced hardness of Fe-C alloy martensite was attributed to its higher dislocation density and the stronger pinning force of interstitial carbon atoms on dislocations.

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Comparison of microstructure and hardness between high-carbon and high-nitrogen martensites

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