Recrystallization Behavior of IF Steel at the Interface of Aluminum Junction
Two cold-rolled IF steel sheets sandwiching an aluminum sheet were heat-treated at 650°C, and the recrystallization behavior in the interfacial region between the IF steel and pure aluminum was observed and analyzed. The tongue-like structure of the η-Fe2Al5 phase appeared in the reaction zone and t...
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Published in | ISIJ International Vol. 62; no. 7; pp. 1469 - 1477 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
The Iron and Steel Institute of Japan
15.07.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Two cold-rolled IF steel sheets sandwiching an aluminum sheet were heat-treated at 650°C, and the recrystallization behavior in the interfacial region between the IF steel and pure aluminum was observed and analyzed. The tongue-like structure of the η-Fe2Al5 phase appeared in the reaction zone and the recrystallized structure of the IF steel was characterized by an equiaxed structure including subgrains in the region surrounded by the η phase. In contrast, a bcc-ferrite phase elongated with a pancake shape was mainly observed in the other regions. The η phase grew preferentially along the c-axis, and the growing η phase caused distortion of the surrounding iron due to the difference in the molar volume. This suggests that compressive strain is generated along both a-axis and b-axis, and tensile strain is generated along c-axis of the η phase. The growth of the η phase obviously changed the recrystallization behavior of the IF steel. The development of the γ-fiber crystalline texture ( /ND), a typical recrystallization texture of IF steel, was not observed in the region surrounded by the tongue-like η phase. The local misorientation in the vicinity of the two-phase interface could not explain the texture change. It is suggested that the growth of the tongue-like η phase caused constraint of the surrounding region and affected nucleation in the recrystallization of the ferrite. |
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ISSN: | 0915-1559 1347-5460 |
DOI: | 10.2355/isijinternational.ISIJINT-2021-505 |