Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 18, Issue 3, Pages 253-260Publisher
MANEY PUBLISHING
DOI: 10.1179/1362171812Y.0000000101
Keywords
Armour steels; Heat affected zone; Heterogeneity
Funding
- NSF I/UCRC Center for Integrative Materials Joining Science for Energy Applications
- SFP Works LLC
- National Science Foundation [NSF-IIP-1034729]
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1034729] Funding Source: National Science Foundation
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Flash processed (FP) steels have shown potential for armour applications based on the response to ballistic loading. In this research, weldability of these steels was studied and compared to commercial high hard (HH) armour steel. Simulated heat affected zone (HAZ) microstructures in these steels were investigated by comprehensive microscopy and hardness mapping. HAZ softening in HH steel was observed on heating to a peak temperature below Ac-1 due to overtempering of original microstructure. In FP steel, the softening was associated with allotriomorphic ferrite formation when heated to a peak temperature between Ac-1 and Ac-3. The transformation kinetics, softening, and hardening characteristics are rationalised based on changes in prior austenite grain size, cooling rate and underlying chemical heterogeneity.
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