Accession Number:

ADA135816

Title:

Metallographic Studies of Erosion and Thermo-Chemical Cracking of Cannon Tubes

Descriptive Note:

Final rept.

Corporate Author:

ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB

Report Date:

1983-05-01

Pagination or Media Count:

24.0

Abstract:

The characteristic erosion features of fired cannons and the closely related surface alterations on laboratory simulation samples have been examined with a variety of electron optical and other analytical techniques. The results suggest that the heat-checking pattern is caused by the large differential thermal contraction between surface austenite and subsurface tempered martensite, the deep longitudinal cracks result from liquid-solid metal embrittlement primarily by copper, and the subsurface microstructural alterations are a consequence of intense carburization by the explosion gases. The observations could provide the basis for thermomechanical modeling of the erosion and cracking of cannon tubes.

Subject Categories:

  • Metallurgy and Metallography
  • Guns
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE