Relation between the Metallographic Structure and Mechanical Properties of a Bimetallic Steel Bar after Fire
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 8
Abstract
Bimetallic steel bar (BSB) consisting of S30408 stainless steel (cladding layer) and HRB400 carbon steel bar (substrate) has outstanding durability, indicating its suitability for RC structures in corrosive environments. The effects of fire on the mechanical properties of BSB in relation to its metallographic structure (MS) were investigated experimentally by exposing BSB specimens to different elevated temperatures and cooling methods. When the exposure temperature (ET) was lower than the austenite transformation temperature, the changes in the MS were relatively small. When the ET was higher than 700°C, lamellar pearlite and lath martensite were formed in the substrate of BSB specimens with cooling in air (CIA) and cooling in water (CIW), respectively, which led to changes in the mechanical properties. The hardness of the BSB specimens also was affected by the ET and cooling method. There always was a yield plateau in the stress–strain curve of the BSB specimens with CIA. When the ET ranged from 700°C to 900°C, the formation of granular pearlite improved the homogeneity of cementite in ferrite, which enhanced the ductility. For BSB specimens with CIW, when the ETs were 800°C and 900°C, the yield plateau in the stress–strain curve disappeared because of the lath martensite in the substrate. Ductile dimples were observed in the scanning electron microscope images of the BSB specimens with CIA. However, for BSB specimens exposed to 900°C with CIW, the ductile dimples were almost negligible.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
We acknowledge the support provided by the National Natural Science Foundation of China (Grant Nos. 51778087 and 51808071) and the Special Funding for the Research Projects of Postdoctoral Researchers in Chongqing (XmT20200011).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 8 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 4, 2021
Accepted: Dec 27, 2021
Published online: May 28, 2022
Published in print: Aug 1, 2022
Discussion open until: Oct 28, 2022
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