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Structure and mechanical properties of dual-phase steel following heat treatment simulations reproducing a continuous annealing line
In the presented investigation, cold-rolled sheets of a selected dual-phase (DP) steel were heat-treated according to varying thermal profiles, thus reproducing continuous annealing process. Initially the samples were soaked at 780 and 810°C for 0–60 s followed by water cooling. Next, samples were preliminary treated by applying the same conditions, however after water cooling these compositions were subject to tempering at 230, 380 and 460°C for both 60 and 240 s. The characterization of the effect of heat-treatment parameters on the mechanical properties and structure is the main objective of this investigation. Mechanical properties of the samples after applied thermal profiles were in line with those requirements imposed on the commercial sheets of DP steels. The obtained results of the investigation showed that tempering deteriorates the Yield Ratio, defined as Rp0.2/Rm. This was caused by the martensite decomposition combined with carbide precipitation processes. Transmission electron microscopy observations revealed precipitated carbides, Fe3C in martensitic and M7C3 in ferritic areas. The quantitative results of the structural investigation were then applied to predict the Rp0.2 and Rm using the Perlade model. The results indicate that discrepancies between the measured tensile tests and calculated Rp0.2 and Rm do not exceed 10%.
Structure and mechanical properties of dual-phase steel following heat treatment simulations reproducing a continuous annealing line
In the presented investigation, cold-rolled sheets of a selected dual-phase (DP) steel were heat-treated according to varying thermal profiles, thus reproducing continuous annealing process. Initially the samples were soaked at 780 and 810°C for 0–60 s followed by water cooling. Next, samples were preliminary treated by applying the same conditions, however after water cooling these compositions were subject to tempering at 230, 380 and 460°C for both 60 and 240 s. The characterization of the effect of heat-treatment parameters on the mechanical properties and structure is the main objective of this investigation. Mechanical properties of the samples after applied thermal profiles were in line with those requirements imposed on the commercial sheets of DP steels. The obtained results of the investigation showed that tempering deteriorates the Yield Ratio, defined as Rp0.2/Rm. This was caused by the martensite decomposition combined with carbide precipitation processes. Transmission electron microscopy observations revealed precipitated carbides, Fe3C in martensitic and M7C3 in ferritic areas. The quantitative results of the structural investigation were then applied to predict the Rp0.2 and Rm using the Perlade model. The results indicate that discrepancies between the measured tensile tests and calculated Rp0.2 and Rm do not exceed 10%.
Structure and mechanical properties of dual-phase steel following heat treatment simulations reproducing a continuous annealing line
Archiv.Civ.Mech.Eng
Radwanski, Krzysztof (author) / Kuziak, Roman (author) / Rozmus, Radoslaw (author)
Archives of Civil and Mechanical Engineering ; 19 ; 453-468
2019-06-01
16 pages
Article (Journal)
Electronic Resource
English
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