Synergistic Effects of Ti and Mo on the Microstructure and Properties of Low-Cost Fire-Resistant and Weather-Resistant Construction Steel
Source abstract
Abstract
In order to meet the increasing demands of superior structural strength, reliability, and safety, low-cost advanced construction steels with excellent high-temperature strength and weather resistance need to be developed. In the present work, the effects of different Ti contents on the high-temperature resistance of low Mo-containing fire-resistant steel were investigated, and a fire-resistant weathering construction steel with the synergistic effect of low Mo and Ti microalloying was developed. The yield strength of the steel at 600 °C was 383 MPa, which was more than two-thirds (67.79%) of its yield strength at room temperature. Moreover, the corrosion resistance of the test steel was better than that of Q345 steel. The microstructure, nanoscale precipitation behavior, and corrosion resistance of the steel were discussed. It was found that the bainitic microstructure exhibited excellent stability at high temperatures. The amount of nanoscale precipitates increased after reheating and tempering at 600 °C for three hours. TiC and (Ti, Mo)C particles of ~ 10-nm size could pin dislocations effectively to guarantee high strength. The synergistic effect of Ti and Mo suppressed the growth of nanoscale precipitates, and the strength loss at 600 °C was compensated by nanoscale precipitation strengthening. Moreover, the thickness of the corrosion product layer formed on the steel matrix surface and the relative content of α-FeOOH increased with time; thus, the steel exhibited superb corrosion resistance.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (56)
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