Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 52, Issue 2, Pages 817-825Publisher
SPRINGER
DOI: 10.1007/s11661-020-06109-0
Keywords
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Funding
- National Nature Science Foundation of China [51704217/51874216]
- International Postdoctoral Exchange Fellowship Program [20180061]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation John Evans Leaders Fund (CFI JELF) [32826]
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The study found that the growth of bainitic ferrite laths can be affected by pre-existing laths, causing growth interruption and re-nucleation. The newly nucleated lath shares the same crystallographic orientation with the prior lath and is termed BF-clone. During growth, transformation strain is accommodated through the formation of twin-related variant pairs.
The growth behavior and crystallographic orientation of bainite in a low carbon steel were investigated by a combination of in situ observation and electron backscattered diffraction. The intersection of different bainitic ferrite (BF) laths was analyzed in detail. The results show that the growth of a given lath stops when it runs into a preexisting lath of bainitic ferrite. Growth resumes, after a short stasis, through the nucleation of a new lath on the other side of the obstructing lath. The newly nucleated lath has been termed BF-clone because it shares the same crystallographic orientation with the prior bainitic lath. The nucleation of the BF-clone is promoted by the accumulated transformation strain in the region where the growing lath intersected the pre-existing lath. During the growth of the bainitic ferrite laths, the transformation strain was accommodated through the formation of twin-related variant pairs, which formed one after another with the identical lengthening rates.
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