MICROSTRUCTURAL STUDIES OF HSLA STEELS FOR NAVAL STRUCTURAL APPLICATIONS

Authors
  1. Krishnadev, M.R.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN);Laval Univ, Quebec QUE (CAN) Dept of Mining and Metallurgy
Abstract
This report is an extension of the work described in the DREP Contractor's Report 90-32 "Characterization of HSLA-80 Steels - Final Report", and deals with the metallographic and mechanical characterization of HSLA-80 thermo-mechanically control-processed (TMCP) steel, HSLA-100 steels, and also a recently developed quenched and tempered low alloy pressure vessel steel, all of which are of particular interest for potential Canadian naval construction. Tensile tests have been used to evaluate strength and ductility. Limited studies of the kinetics of copper precipitation during aging of both the HSLA TMCP steel and a typical commercial HSLA-80 steel have been carried out to assess the effect of alloying elements on the time to peak hardness, and also the rate of over-aging. Instrumented impact testing of both standard and pre-cracked Charpy specimens has been employed to determine the toughness, in particular the maximum load stress intensity under dynamic loading. Optical and transmission electron microscopy have also been used to analyze the microstructural features. Scanning electron microscopy and oblique section metallography have been used to characterize the fracture morphology and to delineate the role of microstructural features in crack initiation and propagation.
Report Number
DREP-CR-93/33 — Contractor Report
Date of publication
01 Mar 1993
Number of Pages
42
DSTKIM No
94-01417
CANDIS No
134914
Format(s):
Hardcopy;Originator's fiche received by DSIS

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