Accession Number:

ADA558384

Title:

Microstructural Investigation and Evaluation of Mechanical Properties in Friction Stir Welded Joints

Descriptive Note:

Technical rept.

Corporate Author:

ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

2011-08-01

Pagination or Media Count:

21.0

Abstract:

With involvement of the United States Military in various places in the world, increased improvements in personnel and vehicle protection are needed. Traditionally, armoring techniques have performed well against particular threats however, a new threat has emerged from improvised explosive devices IEDs, which has exposed the vulnerability of the undercarriage of the vehicle to explosions. Various solutions have been proposed to combat this problem, such as implementation of a unibody construction of the chassis. While traditional joining techniques have shown promise, the variability in mechanical properties of the weldment can be costly and needs to be addressed. Friction Stir Welding FSW is a solid-state welding technique, which involves local softening of the material subjected to severe plastic deformation, coupled with a localized heat flux, creates a unique microstructure in and around the weld that is dependent on the FSW parameters. The current work involves the characterization of the microstructures that develop during FSW as it relates to the locally spatial mechanical properties in the weld zone. The microstructure will be characterized by using scanning electron microscopy SEM and electron backscatter diffraction EBSD techniques, which, when coupled with mechanical testing data, can be used to shed light on the spatial stress-strain behavior of the welded sample.

Subject Categories:

  • Properties of Metals and Alloys
  • Couplers, Fasteners and Joints
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE