Accession Number : ADA137145
Title : Effects of Preheat on Weldments of NICOP Steel.
Descriptive Note : Master's thesis,
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s) : Burna,R F
PDF Url : ADA137145
Report Date : Sep 1983
Pagination or Media Count : 72
Abstract : Shielded metal arc weldments of Armco Steel Corporation's NICOP class 3, 19mm (3/4 inch) plate, conforming to ASTM A710 grade A, were studied to provide information concerning the microstructure in the heat affected zone (HAZ) of weldments fabricated with and without preheat. Microhardness, scanning electron microscopy and transmission electron microscopy were used to determine the effect of preheating on the microstructure. Similar microstructures in the preheat and non-preheat samples were observed. The microstructures were polygonal and acicular ferrite in the base and base/HAZ regions and increasing amounts of bainite and auto tempered martensite islands near the fusion line. From the point of view of microstructure, NICOP appears to be weldable without preheating.
Descriptors : *Steel, *Weldments, *Thermal properties, High strength alloys, Heat treatment, Welding, Microstructure, Fabrication, Microhardness, Polygons, Ferrites, Bainite, Martensite, Fusion welding, Cracking(Fracturing), Toughness, Electron microscopy, Theses
Subject Categories : Properties of Metals and Alloys
Distribution Statement : APPROVED FOR PUBLIC RELEASE