期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.10.062
关键词
ICRCG HAZ; Peak temperature; Toughness; Ultra-fine grain; V-N microalloyed steel
类别
资金
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2011BAE13B03]
Motivated by the small lattice mismatch between ferrite and vanadium nitride (VN), we describe here the welding thermal cycle simulation that provides high toughness in the ICRCG HAZ of low carbon V-N steel. This unique behavior is attributed Lathe formation of ultra-fine grained ferrite along prior austenite grain boundaries generated by the first pass welding thermal cycle with high misorientation boundaries, where V(C, N) precipitates provide potential nucleation sites for ferrite, leading to extraordinary refinement of martensite/austenite (M/A) constituent. Nitrogen stimulates the precipitation behavior of V(C, N). The nucleation of high density of V(C, N) precipitates consumes carbon-content in the austenite, leading to decrease in the carbon-content in the M/A constituent, with consequent decrease in hardness. The increase in toughness is explained in terms of Griffith's crack propagation theory. (C) 2013 Elsevier B.V. All rights reserved.
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