Journal
MATERIALS LETTERS
Volume 273, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2020.127955
Keywords
Metals and alloys; Phase transformation; Electron backscattering diffraction; Variant
Funding
- National Key Research and Development Program of Thirteenth Five-year Plan Period [2017YFB0304400]
- National Natural Science Foundation of China [51574028]
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We studied the transformation of retained austenite in an intercritical annealing quenching and partitioning steel in aspect of mechanically induced martensite variant selection. The martensitic transformation process was characterized through the interrupted tensile tests plus ex-situ electron backscattering diffraction measurements. We have observed two kinds of retained austenite, the larger equiaxed austenite and the finer lamellar austenite. Results show that the variant selection becomes stronger as the retained austenite grain size decreasing. Equiaxed retained austenite tends to transform into a certain variant with close orientation to adjacent ferrite. In this case, phase transformation in specific grains could occur earlier under stress, regardless of the grain size. (C) 2020 Elsevier B.V. All rights reserved.
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