Residual stress analysis of Q1N submarine pressure hull steel with the portable miniature x-ray diffractometer

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Authors
  1. Farrell, S.
  2. MacGregor, L.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
Accurate depiction of residual stress state in submarine structures using X-ray diffraction requires microstructural/compositional analysis and reliable equipment and methodology for analysis. This study was conducted to assess the portable miniature X-ray diffractometer (MXRD), owned and operated by Defence R&D Canada, for accurate determination of residual stress on tempered Q1N steels – such as found on the pressure hull of VICTORIA Class submarines. In the absence of microstructural effects and instrumental alignment issues, not identified in this study, the accuracy of residual stress analysis is believed to be dependent on the accuracy of techniques used for derivation of the X-ray elastic constant (XREC) required for residual stress analysis. In this report, effective XRECs were determined using several methods (literature references, experimental measurement of tensile properties and four-point bending experiments) and results were compared. Specimens of tempered Q1N steel were extracted from the pressure hull of HMCS VICTORIA. A modulus of elasticity of 213 GPa in bending and 208 GPa in tension were determined for the tempered Q1N steel, consistent with literature values for similar steel. Effective XRECs from the MXRD supplier and open literature (specific to the {211} crystallographic planes of bcc Fe) were found to be similar to values derived from tension (163.5 GPa) and four-point bending (167 GPa) tests. Although effective XRECs provide a reasonable estimate,

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Report Number
DRDC-ATLANTIC-TM-2007-335 — Technical Memorandum
Date of publication
01 May 2008
Number of Pages
76
DSTKIM No
CA031797
CANDIS No
530777
Format(s):
CD ROM

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