Iron-based sintered alloy material and production method therefor
AssigneeResonac Corporation
InventorHiroshi OMORI
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Abstract
An iron-based sintered alloy material having, at the surface of the material, a hardened layer exhibiting a martensite phase containing a solid solution of nitrogen in a supersaturated state. The iron-based sintered alloy material may contain at least one of chromium, copper, molybdenum, manganese and nickel. A production method for the iron-based sintered alloy material includes: subjecting an iron-based sintered alloy substrate containing carbon to a nitriding treatment by heating the substrate to a nitriding temperature of at least 590° C. in an atmosphere containing ammonia, and then performing quenching by rapidly cooling the substrate.
Claims7
A production method for an iron-based sintered alloy material comprising:
- molding an iron-based mixed powder comprising 0.1 to 1.2% by mass of a graphite powder and at least one alloying component selected from the group consisting of 0.15 to 4.5% by mass of chromium, 0.2 to 4.5% by mass of copper, 0.1 to 2.0% by mass of molybdenum, 0.1 to 3.0% by mass of manganese, and 0.2 to 4.5% by mass of nickel into a green compact of a desired shape,
- obtaining an iron-based sintered alloy substrate by heating and sintering the green compact at 1,000 to 1,300° C. in a non-oxidizing environment,
- performing a nitriding treatment by heating the iron-based sintered alloy substrate to a nitriding temperature of 590° to 900° C. in an atmosphere comprising ammonia,
- subjecting the iron-based sintered alloy substrate that has undergone the nitriding treatment to a quenching treatment with rapid cooling from a quenching temperature that is a temperature of 640 to 800° C. and is lower than the nitriding temperature, and
- subjecting the iron-based sintered alloy substrate that has undergone the quenching treatment to tempering by heating at 100 to 200° C.
Dependencies are inferred from the claim text.