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Abstract: The I-shaped cross-section of hot-rolled H-beam leads to a significant difference in cooling rate between the web and flange during air cooling, which tends to generate large residual stress within the section, affecting the dimensional accuracy and load-bearing capacity of the member. To investigate the formation mechanism of residual stress and the control effect of flange atomization cooling, Q235B hot-rolled H-beam was taken as the research object. A three-dimensional geometric model was established using SolidWorks, and a thermo-mechanical coupled finite element model was built on the Abaqus platform. The temperature field evolution and residual stress distribution under natural air cooling and two atomization cooling conditions (with convective heat transfer coefficients of 100 W/(m2·K) and 150 W/(m2·K) on the flange surface) were simulated. The results show that under natural air cooling, the cooling rate is relatively low, the maximum residual stress is about 98 MPa, mainly concentrated at the junction of the flange and web, and the residual stress in the middle of the web is about 16 MPa. After adopting flange atomization cooling, the cooling efficiency is significantly improved, the temperature field becomes more uniform, and the residual stress is greatly reduced. When the heat transfer coefficient is 100 W/(m2·K), the maximum residual stress drops to 0.1114MPa; when it is increased to 150 W/(m2·K), it further decreases to 0.0591 MPa. Regardless of the cooling method, the residual stress fluctuates most severely during the initial cooling stage (the first 3000 s) when the temperature changes most drastically, and gradually stabilizes after the temperature drops to 300–400°C. Considering both cooling efficiency and residual stress control, it is recommended to control the heat transfer coefficient of atomization cooling in the range of 50-200W/(m2·K). The research results can provide a theoretical basis for optimizing the controlled cooling process of hot-rolled H-beam.Abstract: The I-shaped cross-section of hot-rolled H-beam leads to a significant difference in cooling rate between the web and flange during air cooling, which tends to generate large residual stress within the section, affecting the dimensional accuracy and load-bearing capacity of the member. To investigate the formation mechanism of residual stress and t...Learn More
Abstract: Taking TA15 titanium alloy slab as the research object, a 1.5 mm sheet was obtained after clad rolling and annealing treatment. The microstructure, texture characteristics, mechanical properties and fracture behavior of the sheet were systematically studied by means of microstructure observation, pole figure analysis, room temperature tensile test and fracture morphology characterization. The results show that the sheet is composed of equiaxed α grains, slender strip α grains and reticular residual β phase, and the microstructure is uniform in different directions. The phase proportion and distribution state are highly consistent on the macroscopic scale, without obvious band segregation or local coarsening. The sheet presents an R-shaped texture, and the transverse and rolling direction texture strengths are 6.25 and 6.32, respectively. The in-plane texture is symmetrical and uniform. The tensile test at room temperature shows that the tensile strength (965 MPa, 962 MPa), yield strength (852 MPa, 853 MPa) and elongation (20%, 21%) of the transverse and rolling directions are very close, and there is no obvious anisotropy. This result fully indicates that under the clad lap rolling and annealing process adopted in this paper, the in-plane mechanical properties of the sheet achieve good isotropy, which is of great application value for load-bearing components under complex stress states in practical engineering. The high strength of the sheet is mainly due to the distortion energy and fine grain strengthening accumulated by deformation, and the good plasticity is attributed to the microstructure dominated by equiaxed α grains. The tensile fracture is composed of a large number of equiaxed dimples and a small number of secondary cracks, which is characterized by a ductile + quasi-cleavage mixed fracture, consistent with the excellent matching of strength and plasticity.Abstract: Taking TA15 titanium alloy slab as the research object, a 1.5 mm sheet was obtained after clad rolling and annealing treatment. The microstructure, texture characteristics, mechanical properties and fracture behavior of the sheet were systematically studied by means of microstructure observation, pole figure analysis, room temperature tensile test ...Learn More
