Iron-based alloy and method of manufacturing the same
AssigneeTohoku University
InventorsKenta Yamanaka, Akihiko Chiba
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Abstract
An iron-based alloy has excellent corrosion resistance and high strength and a method of manufacturing the iron-based alloy. The iron-based alloy includes Cr: 10 to 22 mass %, W: 1 to 12 mass %, and C: 0.1 to 2.3 mass %, with the remainder being unavoidable impurities and Fe, and is composed of a cast material having a structure composed mainly of austenite or a quenched material having a structure composed mainly of martensite and in which carbides are precipitated. The iron-based alloy may further include Cu: 0.5 to 6 mass % and/or Ni: 0.5 to 2.5 mass %, and may further include at least one of Al, Mo, and Si in an amount of 1 to 3 mass %.
Claims9
An iron-based alloy comprising Cr:
- 10 to 22 mass %, W:
- 1 to 12 mass %, C:
- 0.50 to 2.3 mass %, and Cu:
- 0.5 to 6 mass %, with the remainder being unavoidable impurities and Fe, and having a structure composed mainly of martensite in which M23C6-type carbides are precipitated, and having a dislocation density of 0.2×1016 m−2 or more and a Vickers hardness of HV 380 or more.
A method of manufacturing an iron-based alloy, the method comprising manufacturing an iron-based alloy having a structure composed mainly of martensite in which M23C6-type carbides are precipitated, and having a dislocation density of 0.2×1016 m−2 or more and a Vickers hardness of HV 380 or more by heat-treatment at 600° C. to 1250° C. for 0.5 to 24 hours and subsequent rapid cooling of a material prepared by casting or processed after casting a composition of raw materials comprising Cr:
- 10 to 22 mass %, W:
- 1 to 12 mass %, C:
- 0.5 to 2.3 mass %, and Cu:
- 0.5 to 6 mass %, with the remainder being unavoidable impurities and Fe.
Dependencies are inferred from the claim text.