NEW IRON-BASE SUPERALLOY FOR EXHAUST VALVES

For heavy duty gasoline or diesel engines, exhaust valves of 21-2N or 21-4N are generally coated by cobalt-base hard facing alloys, at faces. But the sluggish supply and the spiraling price of cobalt recently forced automakers to adopt valves of high-grade superalloys without hard facing. Candidate superalloys for high-performance exhaust valves are gamma-prime strengthened nickel-base alloys such as Inconel 751 and Nimonic 80A. Unfortunately above-mentioned alloys are too expensive for automobile components. So the authors tried to develop a gamma-prime to strengthened iron-base alloy, which bears basically 40% Ni-19% Cr-Al-Ti. The authors finally succeeded in developing a new gamma-prime strengthened iron-base superalloy, RS914, which is inexpensive and satisfies requirements for exhaust valves of both gasoline and diesel engines.

• Supplemental Notes:
  • Presented at SAE Meeting 23-27 February 1981.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Kato, T
  • Uyehara, N
  • MATSUNAGA, K
  • Isomura, T
  • Matsuno, M
  • Iizuka, M
• Publication Date: 1981

Media Info

• Features: References;
• Pagination: 10 p.
• Serial:
  • Society of Automotive Engineers Preprint
  • Publisher: Society of Automotive Engineers (SAE)

Subject/Index Terms

• TRT Terms: Alternatives analysis; Applications; Cobalt; Costs; Diesel engines; Exhaust pipes; Gasoline engines; Iron alloys; Machine valves; Nickel alloys; Vehicle power plants
• Old TRIS Terms: Automobile engines; Superalloys
• Subject Areas: Finance; Geotechnology; Highways; Materials; Research; Vehicles and Equipment; I34: Steels and Metals; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00341334
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: SAE 810032
• Files: TRIS
• Created Date: Nov 23 1981 12:00AM