Effect of simulated fire temperature on microstructure and anti-seismic performance of Q460FRW steel

doi:10.13251/j.issn.0254-6051.2021.04.007

Abstract

Abstract: In order to study the anti-seismic performance of Q460FRW steel in fire as a disaster, six groups of thermal insulation tests in the range of 250-650 ℃ were conducted on the tested steel, and the microstructure, tensile fracture morphologies and tensile properties at room temperature of the tested steel after insulation test in fire were studied. The results show that the microstructure of the specimens in TMCP state is granular bainite. With the increase of holding temperature, the ferrite matrix in granular bainite continues to grow, the martensitic/austenitic (M/A) components gradually decompose and change from a polygonal island to a lamellar structure. The yield strength and tensile strength both increase first and then decrease with the increase of holding temperature, the yield ratio gradually increases, the plasticity and the anti-seismic performance continues to decline. When the temperature is lower than 550 ℃ and the duration in fire is less than 1 h, the anti-seismic performance of the tested steel can still meet the requirements of the standard GB/T 19879—2015 and GB/T 28415—2012 for high-performance building steel and fire-resistant steel.

Key words: construction steel, fire temperature, M/A component, Y/T ratio, anti-seismic performance

CLC Number:

TG142.1

Dai Zhongwei, He Yizhu, Du Xiaojie. Effect of simulated fire temperature on microstructure and anti-seismic performance of Q460FRW steel[J]. Heat Treatment of Metals, 2021, 46(4): 37-41.

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