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针对10和14mm厚规格700MPa级高强度耐候钢屈服强度和抗拉强度偏低的情况,利用金相显微镜和扫描电镜进行了组织观察,调查了炼钢和热轧工艺过程控制情况,研究了碳化钛的固溶和析出强化对力学性能的影响。结果表明,加热制度执行不够导致碳化钛未完全固溶,冷却温度控制偏高导致钛析出物粗化是造成性能不合的主要原因。通过成分优化及工艺制度调整,实现了碳化钛的充分固溶,提高了钛析出强化效果,解决了力学性能不合的问题。
In view of the low yield strength and low tensile strength of 10MPa and 14mm thick 700MPa high strength weathering steels, the microstructures were observed by metallographic microscope and scanning electron microscope, and the control of steelmaking and hot rolling process was investigated. Effect of Titanium Solution and Precipitation Strengthening on Mechanical Properties. The results show that the insufficient implementation of the heating system leads to the incomplete solution of titanium carbide, and the coarsening of the cooling temperature leads to the coarsening of titanium precipitates, which is the main reason of the incompatibility. Through component optimization and process system adjustment, the solution of titanium carbide is fully achieved, the titanium precipitation strengthening effect is enhanced, and the problem of incompatible mechanical properties is solved.