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Mechanical properties of Q345 structural steel after artificial cooling from elevated temperatures
Abstract Water cannot be used to effectively extinguish fires that occur in chemical plants, oil and gas pipelines, and other flammable and combustible liquid storage structures. In such cases, firefighting foam is often used as a fire-extinguishing agent. In this study, we experimentally investigate the mechanical properties of Q345 steel after subjecting it to temperatures of 200–900 °C, followed by artificial cooling using water or firefighting foam. The fire-affected specimens are subjected to tensile tests to observe their fracture characteristics and obtain their stress–strain curves. Below an exposure temperature of 600 °C, the mechanical properties of Q345 steel remain almost entirely unchanged, irrespective of the cooling method. Above 600 °C, the mechanical properties of Q345 steel experience significant changes based on the exposure temperature and the type of cooling method. When Q345 steel is exposed to temperatures of 800 °C and 900 °C and cooled using water, its yield strength and ultimate strength increase significantly. In contrast, the ductility of the Q345 steel that is water cooled from temperatures of 600–900 °C rapidly decreases with the increase in temperature. When Q345 steel is exposed to temperatures of 600–900 °C and cooled using firefighting foam, it experiences a significant reduction in both yield strength and ultimate strength. In contrast, the ductility of Q345 steel that is cooled using firefighting foam does not change significantly. Subsequently, the macroscopic and microscopic fracture morphologies are also analyzed to better understand the changes in the mechanical properties of Q345 steel. Finally, empirical equations are proposed to predict the mechanical properties of fire-affected Q345 steel that is cooled using water or firefighting foam.
Graphical abstract Display Omitted
Highlights Mechanical properties of Q345 steel cooled by firefighting foam and water is significantly different. Firefighting foam cooling reduces tensile strength and improves ductility of Q345 steel. Water-cooling increases tensile strength and reduces ductility of Q345 steel. The elastic modulus of Q345 steel remain unchanged in case of water cooling and firefighting foam cooling.
Mechanical properties of Q345 structural steel after artificial cooling from elevated temperatures
Abstract Water cannot be used to effectively extinguish fires that occur in chemical plants, oil and gas pipelines, and other flammable and combustible liquid storage structures. In such cases, firefighting foam is often used as a fire-extinguishing agent. In this study, we experimentally investigate the mechanical properties of Q345 steel after subjecting it to temperatures of 200–900 °C, followed by artificial cooling using water or firefighting foam. The fire-affected specimens are subjected to tensile tests to observe their fracture characteristics and obtain their stress–strain curves. Below an exposure temperature of 600 °C, the mechanical properties of Q345 steel remain almost entirely unchanged, irrespective of the cooling method. Above 600 °C, the mechanical properties of Q345 steel experience significant changes based on the exposure temperature and the type of cooling method. When Q345 steel is exposed to temperatures of 800 °C and 900 °C and cooled using water, its yield strength and ultimate strength increase significantly. In contrast, the ductility of the Q345 steel that is water cooled from temperatures of 600–900 °C rapidly decreases with the increase in temperature. When Q345 steel is exposed to temperatures of 600–900 °C and cooled using firefighting foam, it experiences a significant reduction in both yield strength and ultimate strength. In contrast, the ductility of Q345 steel that is cooled using firefighting foam does not change significantly. Subsequently, the macroscopic and microscopic fracture morphologies are also analyzed to better understand the changes in the mechanical properties of Q345 steel. Finally, empirical equations are proposed to predict the mechanical properties of fire-affected Q345 steel that is cooled using water or firefighting foam.
Graphical abstract Display Omitted
Highlights Mechanical properties of Q345 steel cooled by firefighting foam and water is significantly different. Firefighting foam cooling reduces tensile strength and improves ductility of Q345 steel. Water-cooling increases tensile strength and reduces ductility of Q345 steel. The elastic modulus of Q345 steel remain unchanged in case of water cooling and firefighting foam cooling.
Mechanical properties of Q345 structural steel after artificial cooling from elevated temperatures
Zhang, Chuntao (Autor:in) / Wang, Ruheng (Autor:in) / Zhu, Li (Autor:in)
27.10.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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