Decarburizing Behavior and Its Effect on Mechanical Properties of Ultrahigh Strength Steel Sheets
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- Kuwata Kentaro
- Graduate School of Natural Science and Technology, Okayama University
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- Takemoto Yoshito
- Graduate School of Natural Science and Technology, Okayama University
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- Okayasu Mitsuhiro
- Graduate School of Natural Science and Technology, Okayama University
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- Bian Jian
- Niobium Tech Asia
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- Senuma Takehide
- Graduate School of Natural Science and Technology, Okayama University
抄録
<p>In this study, the decarburization behavior, and its effect on mechanical properties of 2000 MPa class martensitic steel were investigated with the purpose of collecting the basic data to realize the further strengthening of structural members for automobiles. Concerning the decarburization behavior, the maximum of the decarburization rate of 2000 MPa class martensitic steel with a basic chemical composition of 0.35%C-1.2%Mn was found around 750°C and the thickness of the decarburized zone grew proportional to the square root of time. The addition of Nb reduced the decarburization rate.</p><p>Concerning the effect of decarburization on mechanical properties, the decarburization significantly improved bendability even though the thickness of the decarburized layer is relatively thin. An observation of the crack behavior revealed that the initiation and propagation of the crack were suppressed by the decarburization layer. The resistance to delayed fracture was improved by decarburization. This improvement is presumed to be based on a similar mechanism for the improvement of bendability.</p>
収録刊行物
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- ISIJ International
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ISIJ International 61 (4), 1300-1308, 2021-04-15
一般社団法人 日本鉄鋼協会
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詳細情報 詳細情報について
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- CRID
- 1390850646113958528
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- NII論文ID
- 130008024827
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- ISSN
- 13475460
- 09151559
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可