Iron-based sintered alloy and method for producing the same
AssigneeThe Japan Steel Works, Ltd.
InventorsYusuke Watanabe, Kakeru Kusada, Tetsuo Makida, Youhei Sawamura
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Abstract
An iron-based sintered alloy, which has a composition including, 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 an island form in a matrix, among other characteristics.
Claims6
An iron-based sintered alloy which is used in a die and a cutter blade for a pelletizer of a resin extruder, 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, and the iron-based sintered alloy having a structure in which hard particles are dispersed in a matrix,
- wherein a coefficient of friction after passing through a conforming stage is 0.12 or less in a friction test in water by a cutter blade-on-disk method simulating a die and a cutter blade,
- the 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.
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.
Dependencies are inferred from the claim text.