Low-Temperature Micro-Fracture Toughness Testing of Grain Boundaries in Steel
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- Shimada Yusuke
- NIPPON STEEL CORPOLATION
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- Harada Kosei
- Kumamoto University, Department of Materials Science and Engineering
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- Mine Yoji
- Kumamoto University, Department of Materials Science and Engineering
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- Yoshimura Masahide
- NIPPON STEEL CORPOLATION
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- Takashima Kazuki
- Kumamoto University, Department of Materials Science and Engineering
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Abstract
<p>Temper embrittlement in high-strength steel occurs due to the segregation of impurity elements along prior austenite (γ) grain boundaries, resulting in a decrease in intergranular strength. However, the grain boundary properties have not yet been experimentally investigated. In this study, we developed a micro testing method to selectively process micro-cantilever specimens based on a specific prior γ-grain boundary to measure the grain boundary fracture toughness. Fracture toughness tests using micro-cantilever specimens with side grooves and notch were carried out at 183 K and brittle fracture behavior was successfully obtained. The fracture surface showed almost flat and brittle crack propagation along the prior γ-grain boundary. The derived fracture toughness value, KQ, is lower than that from previous values. By employing this method for the evaluation of intergranular fractures in steel, we believe that we can evaluate more intrinsic prior γ-grain boundary properties compared with conventional methods.</p>
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 62 (4), 570-573, 2021-04-01
The Japan Institute of Metals and Materials
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Keywords
Details 詳細情報について
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- CRID
- 1390287462798620160
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- NII Article ID
- 130008002813
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 031359283
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed