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The role of microstructure in the fast fracture of multipass welds deposited using E-10018-M1 electrodes / James L. Davidson
Bib ID 2951507
Format BookBook
Author
Davidson, James L
 
Description Melbourne, (Vic.) : DSTO Aeronautical and Maritime Research Laboratory, 1996 
17 p. : ill. ; 30 cm. 
Series

Technical report (Defence Science and Technology Organisation (Australia)) ; DSTO-TR-0383.

Summary

Weld metal deposited using MIL-E-10018-M1 electrodes maintains very good fracture resistance, despite being comprised of a seemingly deleterious microstructure which includes extensive networks of pro-eutectoid grain boundary ferrite in the as-deposited weld metal and brittle martensite-austenite particles in the intercritically reheated weld metal and heat affected zone. To reconcile this contradictory structure-property relationship the report focuses on the fractography and metallography of a MIL-E-10018-M1 multipass weld, fractured during an explosion bulge test. Martensite-austenite particles identified in the intercritically reheated weld metal and heat affected zones were found to play no part in the fracture process. Pro-eutectoid grain boundary ferrite was shown to be the preferred fracture path in the as-deposited weld metal however, it does not substantially reduce the overall fracture resistance of the multipass weld metal. The very good fracture resistance of this weld metal is attributed to the interlocking grains of acicular ferrite contained within the prior-austenite grains and the relatively low volume fraction (18%) of as-deposited weld metal in the mulitpass weld. int

Notes

Bibliography: p. 6.

Subjects Military research -- Australia.  |  Materials -- Research -- Australia.  |  Submarines (Ships)  |  Welded joints -- Cracking.  |  Welded joints -- Defects.
Other authors/contributors Defence Science and Technology Organisation (Australia)  |  Aeronautical and Maritime Research Laboratory (Australia)
Terms of Use Commonwealth of Australia 1996. 

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