Ihi Corporation

Daido Steel Co., Ltd.

Isao Nakanowatari

Haruki Eguchi

Natsuki Yoneyama

Hidekazu Tomono

Hiroo Takahashi

Satoshi Takahashi

Shigeki Ueta

Hiroki Yoshizawa

Hiroyuki Takabayashi

Keisuke Nagao

Yuta Tanaka

Kota Sasaki

Ei Kimura

Koshiro Yamane

Satoru Yusa

Akihiro Nomura

Osamu Harasaki

A rare earth permanent magnet includes a main phase containing: a rare earth element R of one or more types including Nd; an element L of one or more types selected from a group consisting of Co, Be, Li, Al, and Si; B; and Fe, wherein crystals which form the main phase belong to P4/mnm; some of B atoms occupying a 4f site of the crystals are substituted with atoms of the element L; each distribution of Nd atoms and the atoms of the element L appears along a C-axis direction of the crystals in a plurality of cycles; and the rare earth permanent magnet includes an area where a cycle of the atoms of the element L matches a cycle of the Nd atoms.

Rare earth permanent magnet and rare earth permanent magnet manufacturing method

A magnetic property of a rare earth permanent magnet containing neodymium, iron, and boron is enhanced. The present disclosure is a rare earth permanent magnet with a compound represented by a following expression as a main phase: NdFeBM. In the expression, M represents an element selected from any one of cobalt, beryllium, lithium, aluminum, and silicon and x satisfies 0.01&#x2264;x&#x2264;0.25. The main phase has an Nd&#x2014;Fe&#x2014;B layer and an Fe layer periodically and part of boron is substituted with any one or more types of elements selected from a group consisting of cobalt, beryllium, lithium, aluminum, and silicon.

The present invention provides a maraging steel containing: 0.10&#x2266;C&#x2266;0.30 mass %, 6.0&#x2266;Ni&#x2266;9.4 mass %, 11.0&#x2266;Co&#x2266;20.0 mass %, 1.0&#x2266;Mo&#x2266;6.0 mass %, 2.0&#x2266;Cr&#x2266;6.0 mass %, 0.5&#x2266;Al&#x2266;1.3 mass %, and Ti&#x2266;0.1 mass %, with the balance being Fe and unavoidable impurities, and satisfying 1.00&#x2266;A&#x2266;1.08, in which A is 0.95+0.35&#xd7;[C]&#x2212;0.0092&#xd7;[Ni]+0.011&#xd7;[Co]&#x2212;0.02&#xd7;[Cr]&#x2212;0.001&#xd7;[Mo], where [C] indicates a content (mass %) of C, [Ni] indicates a content (mass %) of Ni, [Co] indicates a content (mass %) of Co, [Cr] indicates a content (mass %) of Cr, and [Mo] indicates a content (mass %) of Mo, respectively. The maraging steel has a tensile strength of 2,300 MPa or more and is also excellent in the toughness/ductility and fatigue characteristics.

Aircraft engine shaft comprising a maraging steel having a tensile strength of 2300MPa or more

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Tokyo, Japan

Isao Nakanowatari