Effect of Microstructural Inhomogeneity on Reference Temperature Determination

PDF

Authors
  1. Liu, W.J.
  2. Tyson, W.R.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Canada Centre for Mineral and Energy Technology, Ottawa ONT (CAN) Metals Technology Labs
Abstract
ASTM standard test method E1921 provides a method for the determination of the reference temperature used to quantify the resistance of ferritic steels to cleavage fracture within the ductile-brittle transition range. In its current form this standard can only be used to evaluate the fracture resistance of mechanically “uniform” materials. Materials such as multi-pass welds, and heat-affected zones (HAZs) frequently have inhomogeneous microstructures. It has been argued that such variability would invalidate the three parameter Weibull statistical approach which is the basis of the test method. The purpose of this project is to determine whether an analytical rationale could be developed for the evaluation of non stress-relieved welds and also HAZs using this test method. In this work, a “local approach” description of cleavage fracture in homogeneous materials has been modified to account for microstructural heterogeneity. From the modified theory, the Weibull fracture model can be re-derived with a sound physical underpinning. The new theory thus provides a foundation for extending the range of materials covered by ASTM E1921.

Il y a un résumé en français ici.

Report Number
DRDC-ATLANTIC-CR-2003-031 — Contractor Report
Date of publication
01 Mar 2003
Number of Pages
34
DSTKIM No
CA023934
CANDIS No
521269
Format(s):
CD ROM

Permanent link

Document 1 of 1

Date modified: