Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 46A, Issue 7, Pages 2999-3014Publisher
SPRINGER
DOI: 10.1007/s11661-015-2916-2
Keywords
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Funding
- National Basic Research Program of China [2014CB660810]
- National Nature Science Foundation of China [51301083, 51265028]
- Rose Willow Outstanding Individual Programs of Lanzhou university of Technology [J201203]
- ORNL's Shared Research Equipment (ShaRE) User Program - Office of Basic Energy Sciences, the U.S. Department of Energy
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This paper analyzes the micromechanism of decrease of impact toughness with increasing the welding heat input in coarse-grain heat-affected zone (CGHAZ) of a low-alloy high-strength ship-building steel plate. By comparing the microstructures, measuring the extending length of the fibrous crack, identifying the critical event of cleavage fracture, measuring the critical length, and calculating the local cleavage fracture stress sigma (f), and then using the basic principles of the micromechanism of cleavage fracture, this work reveals the essential causes of deteriorated toughness in the CGHAZ of high-strength steel welded joints.
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