No.1019 2022自動車関連技術特集号 転がり接触における残留オーステナイトの加工誘起マルテンサイト変態挙動 |
| カテゴリー | 論文 |
|---|---|
| 筆者 | 研究開発本部 材料研究部 博士（工学） 金谷康平 国立研究開発法人物質・材料研究機構 電子顕微鏡解析ステーション 諸永 拓 国立研究開発法人物質・材料研究機構 電子顕微鏡解析ステーション 博士（工学） 原 徹 金沢大学大学院 自然科学研究科 機械科学専攻 工学博士 潮田浩作 |
| 要旨 | The deformation-induced martensitic transformation is a phenomenon that significantly improves the mechanical properties of steels, and is well known to be beneficial for the rolling contact fatigue (RCF) of bearings. In the present study, the characteristics of the deformation-induced martensitic transformation in the RCF of carburized, quenched and tempered SAE4320 steel were investigated in detail using scanning electron microscopy with electron backscattering diffraction and transmission electron microscopy with automated crystal orientation mapping. These analyses clarified that different variants of the extremely fine deformation-induced martensites as small as several tens of nm were formed within an austenite grain with RCF, and the martensites were speculated to have the Kurdjumov-Sachs or the Nishiyama-Wasserman relationship with the retained austenite. Furthermore, the deformation-induced martensites were preferentially formed within the retained austenite grains rather than at the interface between the tempered martensite and retained austenite. This suggests that the deformation-induced martensites were formed from some localized regions that were plastically introduced within the retained austenite grains. |
| キーワード | Rolling contact fatigue (RCF), Steel, Martensite, Austenite, Deformation-induced martensitic transformation, SEM, EBSD, ACOM, TEM |
| 関連タグ |
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