Accession Number:

ADA038837

Title:

Monotonic and Low-Cycle Fatigue Response of a Maraging Steel and Metastable beta Titanium Alloy under Torsional Loading

Descriptive Note:

Final rept.

Corporate Author:

ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA

Personal Author(s):

Report Date:

1977-02-01

Pagination or Media Count:

14.0

Abstract:

This study deals with the torsional response of Ti-8823 and 18Ni 200 maraging steel. The effect of different heat treatments and the subsequent change in microstructure are investigated. In the case of the Ti-8823, a comparison was made between the solution-treated-and-aged condition, and the direct-aged condition. It was found that the finer precipitate morphology in the DA material offered a greater resistance to torsional fatigue. For the 18Ni 200 maraging steel, an increase of aging time from 3 to 98 hours led to a substantial increase in the amount of reverted austenite, which in turn led to a significant improvement in torsional fatigue behavior. The results are analyzed in terms of the Manson-Coffin equation.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE