期刊
MATERIALS CHARACTERIZATION
卷 61, 期 7, 页码 726-731出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2010.04.004
关键词
Steels; Heat-affected zone; Electron backscatter diffraction; Nanohardness indentation; Three-dimensional morphology
类别
资金
- NSFC (National Natural Science Foundation of China)
- Baosteel [50734004]
The microstructure of acicular ferrite and its formation for the grain refinement of coarse-grained region of heat-affected zone of high strength low-alloy bainite steels were studied using three-dimensional reconstruction technique. Crystallographic grain size was analyzed by means of electron backscatter diffraction. It was revealed that the microstructure in the coarse-grained region of the heat-affected zone consisted of predominantly bainite packets and a small proportion of acicular ferrite. Acicular ferrite was of lath or plate-like rather than needle or rod-like morphology. Tempering of the coarse-grained region of heat-affected zone showed that the acicular ferrite was more stable than the bainite, indicating that the acicular ferrite was formed prior to bainite. The acicular ferrite laths or plates divided the prior austenite grains into smaller and separate regions, and confining the bainite transformed at lower temperatures in the smaller regions and hence leading to the grain refinement in the coarse-grained region of the heat-affected zone. (C) 2010 Elsevier Inc. All rights reserved.
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