EVALUATION OF HEAT AFFECTED ZONE MICROSTRUCTURE/MECHANICAL PROPERTIES OF HY100 GRADE STEELS

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Authors
  1. Bowker, J.T.
  2. Gianetto, J.A.
  3. Letts, M.W.
Corporate Authors
Metals Technology Labs, Ottawa ONT (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
A joint agreement project between MTL and DREA was initiated to evaluate the HAZ structure and properties of candidate HY100 grade steels for submarine fabrication. In this investigation Gleeble simulation is being employed to identify the microstructural constituents, hardness and resultant notch toughness of a range of HAZ regions which may act as local brittle zone in multipass weldments. The steels under investigation which have a nominal yield strength of 700 MPa are a highly alloyed HRS 650 M steel made in France and a conventional HY100 grade steel produced in the United States. The experimental program included evaluation of both single and double cycled HAZ regions with two cooling times representing welding energy inputs of 2 and 4 kJ/mm. A series of single thermal cycles were developed to represent the grain coarsened (GC) HAZ with a peak temperature Tp = 1350C, grain refined (GR HAZ with Tp = 1000C, intercritical (IC) HAZ with Tp = 800C and subcritical (SC) HAZ with Tp = 650C. Second thermal cycles with Tp2 = 1000C, TP2 = 800C and Tp 2 = 650C were used to establish the effects of reheating on the GCHAZ. The results showed that superior notch toughness properties were obtained for all the simulated HAZ regions of the French HRS-650M steel compared with the corresponding regions of the US HY100 grade steel. TRUNCATED
Report Number
DREA-NAMT-93-1-PAP-3 — CONTAINED IN 99-00578
Date of publication
30 Apr 1993
Number of Pages
33
DSTKIM No
99-00581
CANDIS No
510308
Format(s):
Hardcopy;Document Image stored on Optical Disk

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