US 11,891,682 B2
Iron-based sintered alloy and method for producing the same
Yusuke Watanabe, Hiroshima (JP); Kakeru Kusada, Hiroshima (JP); Tetsuo Makida, Hiroshima (JP); and Youhei Sawamura, Hiroshima (JP)
Assigned to THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Filed by THE JAPAN STEEL WORKS, LTD., Tokyo (JP)
Filed on Jul. 7, 2020, as Appl. No. 16/922,373.
Application 16/922,373 is a division of application No. 15/190,643, filed on Jun. 23, 2016, granted, now 10,745,786.
Claims priority of application No. 2015-127114 (JP), filed on Jun. 24, 2015.
Prior Publication US 2020/0332403 A1, Oct. 22, 2020
Int. Cl. C22C 38/56 (2006.01); C22C 38/44 (2006.01); C22C 38/22 (2006.01); C22C 38/36 (2006.01); C22C 33/02 (2006.01); C22C 38/14 (2006.01); B22F 1/00 (2022.01); B22F 3/04 (2006.01); B22F 3/16 (2006.01); B22F 3/24 (2006.01); B22F 9/04 (2006.01); B26F 1/44 (2006.01); C22C 38/06 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01); B22F 5/00 (2006.01)
CPC C22C 38/56 (2013.01) [B22F 1/00 (2013.01); B22F 3/04 (2013.01); B22F 3/16 (2013.01); B22F 3/24 (2013.01); B22F 9/04 (2013.01); B26F 1/44 (2013.01); C22C 33/0285 (2013.01); C22C 33/0292 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); C22C 38/22 (2013.01); C22C 38/36 (2013.01); C22C 38/44 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); B22F 2003/248 (2013.01); B22F 2005/001 (2013.01); B22F 2201/20 (2013.01); B22F 2301/35 (2013.01); B22F 2302/10 (2013.01); B22F 2304/10 (2013.01); B22F 2998/10 (2013.01); B26F 2001/4436 (2013.01)] 6 Claims
OG exemplary drawing
 
2. An iron-based sintered alloy that is used in sliding components in pairs, the iron-based sintered alloy having a composition comprising, in terms of percent by mass, Ti: 18.4 to 24.6%, Mo: 2.8 to 6.6%, C: 4.7 to 7.0%, Cr: 7.5 to 10.0%, Ni: 4.5 to 6.5%, Co: 1.5 to 4.5%, Al: 0.6 to 1.0%, the balance being Fe and unavoidable impurities,
wherein the alloy has a structure in which hard particles are dispersed in a matrix, an area ratio of the hard particles is 38% to 41% and standard deviation of the area ratio of the hard particles is 2.5 to 3.5, and a maximum circle equivalent diameter of the hard particles is a predetermined value of 26.77 μm to 10 μm, and
the hard particles have a fine and relatively uniform shape and are homogenously dispersed over the whole matrix.