US 11,858,045 B2
Fe-based sintered body, Fe-based sintered body production method, and hot-pressing die
Kazuhiro Matsugi, Hiroshima (JP); Yujiao Ke, Hiroshima (JP); Zhefeng Xu, Hiroshima (JP); Kenjiro Sugio, Hiroshima (JP); Yongbum Choi, Hiroshima (JP); Gen Sasaki, Hiroshima (JP); Hajime Suetsugu, Hiroshima (JP); Hiroki Kondo, Hiroshima (JP); Hideki Manabe, Hiroshima (JP); Kyotaro Yamane, Hiroshima (JP); Kenichi Hatakeyama, Hiroshima (JP); Keizo Kawasaki, Hiroshima (JP); Tsuyoshi Itaoka, Hiroshima (JP); Shinsaku Seno, Hiroshima (JP); Yasushi Tamura, Tokyo (JP); Ichirou Ino, Hiroshima (JP); and Yoshihide Hirao, Hiroshima (JP)
Assigned to Hiroshima University, Hiroshima (JP); Y-tec Corporation, Hiroshima (JP); keylex corporation, Hiroshima (JP); and Mazda Motor Corporation, Hiroshima (JP)
Appl. No. 17/266,375
Filed by Hiroshima University, Hiroshima (JP); Y-tec Corporation, Hiroshima (JP); KEYLEX CORPORATION, Hiroshima (JP); and Mazda Motor Corporation, Hiroshima (JP)
PCT Filed Jul. 24, 2019, PCT No. PCT/JP2019/029057
§ 371(c)(1), (2) Date Feb. 5, 2021,
PCT Pub. No. WO2020/031702, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 2018-148885 (JP), filed on Aug. 7, 2018.
Prior Publication US 2021/0308756 A1, Oct. 7, 2021
Int. Cl. B22F 3/105 (2006.01); B22F 3/00 (2021.01); B22F 3/14 (2006.01); B22F 9/04 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01)
CPC B22F 3/105 (2013.01) [B22F 3/004 (2013.01); B22F 3/14 (2013.01); B22F 9/04 (2013.01); C22C 33/0292 (2013.01); C22C 38/00 (2013.01); B22F 2003/1051 (2013.01); B22F 2009/043 (2013.01); B22F 2301/35 (2013.01); B22F 2302/05 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A Fe-based sintered body comprising:
a matrix containing Fe as a main component; and
a dispersed phase in the matrix,
the matrix being formed in a network shape and containing αFe,
the dispersed phase including a hard phase containing TiC, the hard phase having a ring shape or a ring-like shape, and
the hard phase having a width of not more than 1.0 μm in a direction perpendicular to a circumferential direction of the hard phase,
wherein the matrix accounts for not less than 60% by mass in the Fe-based sintered body, and the matrix has a cementite content of not more than 5% by mass, and wherein the Fe-based sintered body has a surface portion which is exposed to outside and an inside portion which is present closer to a center as compared to the surface portion, and the surface portion has a higher hardness than the inner portion.