Accession Number:

ADA114451

Title:

Characterization of an HY-130 Steel Weldment by Transmission Electron Microscopy.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

• Elger,Wallace Michael

Report Date:

1981-12-01

Pagination or Media Count:

86.0

Abstract:

A wrought HY-130 steel weldment was studied to provide information about metallurgical differences in the weld heat affected zone HAZ. Three GMAW welded areas were mapped and analyzed heavily tempered, moderately tempered and untempered regions. Transverse sections were cut along the weld HAZ and the section microhardness compared with a previous microhardness traverse across the region to determine the location within the HAZ. Transmission electron microscopy revealed the occurrence of significant metallurgical changes from the fusion line to the HAZbase metal interface. Microstructures were found to be similar to those of a low carbon steel, changing from a fine lath martensite at the HAZbase metal interface to a mixture of upper bainite and fine lath martensite in the HAZ near the fusion line and finally to lower acicular bainite in the weld metal. Author

Descriptors:

• *Steel
• *Welds
• *Weldments
• *Mechanical properties
• Electron microscopy
• Microstructure
• Classification
• Microhardness
• Heat treatment
• Fusion(Melting)
• Base metal
• Bainite
• Martensite
• Thermal properties
• Transition temperature
• Transverse
• Theses

Subject Categories:

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

Distribution Statement:

APPROVED FOR PUBLIC RELEASE