Accession Number:

AD0729025

Title:

High-Temperature Nitriding of Calorized Steel,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1971-06-30

Pagination or Media Count:

10.0

Abstract:

To reduce the time required for the nitriding of calorized steel, the temperature of nitriding was increased without decreasing the hardness of the calorized layer. Specimens from steel St. 3 were conventionally calorized in powders at 950 degrees for 4-6 hr., obtaining a calorized layer of 0.45-0.55 mm with a hardness of 350-380 kgfmmsuperscript 2 and an Al concentration on the surface of 28-30 percent. To prevent the formation of a brittle layer during nitriding 0.15-0.17 mm of the surface was polished away. The nitriding was carried out at 600, 700, 800, and 850 degrees with holding times 1, 2, 4, and 6 hr. Author

Subject Categories:

  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE