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

PDF Url : ADA114451

Report Date : Dec 1981

Pagination or Media Count : 86

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 HAZ/base metal interface. Microstructures were found to be similar to those of a low carbon steel, changing from a fine lath martensite at the HAZ/base 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