Experimental study on mechanical properties of TMCP #br#
high strength steel at elevated temperatures
Song Linxin1 Li Guoqiang1,2
1. College of Civil Engineering, Tongji University, Shanghai 200092, China; 2National Key
Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
Abstract：An experimental study was conducted on TMCP (Thermo-Mechanical Controlled Process) high-strength steel Q550 by the steady-state method to investigate its mechanical properties at different temperatures. The experimental phenomena, stress-strain relationship and basic mechanical properties including elastic modulus, yield strength, ultimate strength and ultimate elongation at 30～800℃ were obtained. Results show that the yield plateau of the stress-strain curve only exists at 30℃, and the curve shape changes significantly at above 300℃. Elastic modulus and strength increase slightly at 200～300℃ but decrease at above 300℃ and mainly reduce at 400～700℃. Ultimate elongation decreases at 200～450℃ but increases at above 450℃. The comparison between the test results and corresponding research results of QT (Quenched and Tempered) high-strength steel Q550 shows that, at the same temperature the degree of strength reduction of TMCP Q550 steel is almost consistent with QT Q550 steel, while the degree of reduction on elastic modulus of TMCP Q550 steel is more serious than that of QT Q550 steel, which can be explained by microstructure. Based on test results, a mathematical model on the mechanical properties of TMCP Q550 steel at elevated temperatures is established.
宋林昕 李国强. 控轧控冷型高强钢高温下的力学性能试验研究[J]. 土木工程学报, 2021, 54(2): 84-92.
Song Linxin Li Guoqiang. Experimental study on mechanical properties of TMCP #br#
high strength steel at elevated temperatures. 土木工程学报, 2021, 54(2): 84-92.
