Disclosed are an outer ring for an oil pump having an increased number and size of open pores in a surface of a molded article and a method for manufacturing the outer ring.

Disclosed are an outer ring for an oil pump having an increased number and size of open pores in a surface of a molded article and a method for manufacturing the outer ring.

A tool and die set and related method of use of the tool and die set in a press for the compaction of a powder metal into a preform involves an uneven amount of positional deflection of at least two lower or upper tool members. This asymmetrical elastic response under load may help to eliminate cracking of the part after the compressive load is removed.

A tool and die set and related method of use of the tool and die set in a press for the compaction of a powder metal into a preform involves an uneven amount of positional deflection of at least two lower or upper tool members. This asymmetrical elastic response under load may help to eliminate cracking of the part after the compressive load is removed.

This heat-resistant sintered material has, as an overall composition, a composition including, in terms of % by mass, Cr: 15% to 30%, Ni: 8% to 30%, Si: 2.0% to 6.0%, and C: 0.5% to 2.5% with a remainder being Fe and inevitable impurities, wherein the heat-resistant sintered material has a structure in which hard phases are dispersed in a matrix, the matrix includes Fe, Cr, Ni, and Si, the hard phase includes Fe, Cr, and C, and a porosity is 2.0% or less.

This heat-resistant sintered material has, as an overall composition, a composition including, in terms of % by mass, Cr: 15% to 30%, Ni: 8% to 30%, Si: 2.0% to 6.0%, and C: 0.5% to 2.5% with a remainder being Fe and inevitable impurities, wherein the heat-resistant sintered material has a structure in which hard phases are dispersed in a matrix, the matrix includes Fe, Cr, Ni, and Si, the hard phase includes Fe, Cr, and C, and a porosity is 2.0% or less.

A cutting tool includes a cemented carbide substrate. The cemented carbide consists of hard constituents in a metallic binder. The hard constituents include WC. The WC content in the cemented carbide is 80-93 wt %. The cemented carbide has Ni and Al, and a Ni content of 3-13 wt %, a weight ratio of Co/Ni<0.33, a weight ratio of Fe/Ni<0.25, a weight ratio of Cr/Ni<0.25 and a weight ratio of 0.02<Al/(Ni+Co+Fe)<0.1. The crack resistance W is defined as the ratio of the load applied on a Vickers hardness indentation and the total crack length of the cracks formed at the corners of the Vickers hardness indentation. The product of the hardness H(rake) at the rake face and the crack resistance W(rake) at the rake face is H(rake)*W(rake)>5000 HV100*N/μm.

A cutting tool includes a cemented carbide substrate. The cemented carbide consists of hard constituents in a metallic binder. The hard constituents include WC. The WC content in the cemented carbide is 80-93 wt %. The cemented carbide has Ni and Al, and a Ni content of 3-13 wt %, a weight ratio of Co/Ni<0.33, a weight ratio of Fe/Ni<0.25, a weight ratio of Cr/Ni<0.25 and a weight ratio of 0.02<Al/(Ni+Co+Fe)<0.1. The crack resistance W is defined as the ratio of the load applied on a Vickers hardness indentation and the total crack length of the cracks formed at the corners of the Vickers hardness indentation. The product of the hardness H(rake) at the rake face and the crack resistance W(rake) at the rake face is H(rake)*W(rake)>5000 HV100*N/μm.

A cutting tool includes a substrate of cemented carbide having hard constituents in a metallic binder. The hard constituents include WC. The WC content in the cemented carbide is 80-95 wt %. The cemented carbide has a Fe+Ni+Co+Cr content of 3-13 wt %, an atomic ratio of 0.05<Fe/(Fe+Ni+Co+Cr)<0.35, an atomic ratio of 0.05<Ni/(Fe+Ni+Co+Cr)<0.35, an atomic ratio of 0.05<Co/(Fe+Ni+Co+Cr)<0.35 and an atomic ratio of 0.05<Cr/(Fe+Ni+Co+Cr)<0.35. The crack resistance W measured on the rake face of the cutting tool is at least 25% higher than the W measured on a cross section of the bulk area of the cutting tool.

A cutting tool includes a substrate of cemented carbide having hard constituents in a metallic binder. The hard constituents include WC. The WC content in the cemented carbide is 80-95 wt %. The cemented carbide has a Fe+Ni+Co+Cr content of 3-13 wt %, an atomic ratio of 0.05<Fe/(Fe+Ni+Co+Cr)<0.35, an atomic ratio of 0.05<Ni/(Fe+Ni+Co+Cr)<0.35, an atomic ratio of 0.05<Co/(Fe+Ni+Co+Cr)<0.35 and an atomic ratio of 0.05<Cr/(Fe+Ni+Co+Cr)<0.35. The crack resistance W measured on the rake face of the cutting tool is at least 25% higher than the W measured on a cross section of the bulk area of the cutting tool.