不同热处理冷却条件对建筑结构钢性能影响的研究

Study on Effects of Different Heat Treatment Cooling Conditions on Performance of Building Structural Steel

为理解Ti合金建筑结构钢的组织性能、TiC析出行为及强化机制,通过光学显微镜、拉伸试验机和电化学工作站,对不同热处理冷却条件下Ti合金化结构钢的微观组织、屈服和抗拉强度、耐腐蚀性能进行研究。结果表明,Ti合金化和热处理冷却速率的增加,均有助于传统结构钢的组织细化、强度与抗腐蚀性能的提高。但是,在较快的冷却速度下不利于TiC的析出,从而使含钛钢的析出强化效果不明显,含钛钢屈服强度和抗拉强度的增加并不明显。基于此,在传统结构钢基础上,通过Ti合金化和改变加工工艺,研制高强度、耐腐蚀性结构钢,为后续Ti合金化结构钢的研制开发提供借鉴和参考。

In order to fully understand the microstructure and properties of Ti alloyed building structural steel, TiC precipitation behavior and strengthening mechanism, the microstructure, yield strength, tensile strength, and corrosion resistance of Ti alloyed structural steel under different heat treatments and cooling conditions were studied by using the optical microscope, tensile testing machine and electrochemical workstation. The results show that Ti alloying and increasing heat treatment cooling rate contribute to the grain refinement, and improve the strength and corrosion resistance of traditional structural steel. However, the faster cooling rate is not conducive to the precipitation of TiC, so that the precipitation strengthening effect of Ti-containing steel is not obvious, and the increase in yield strength and tensile strength of titanium-containing steel is not obvious. Based on this, on the basis of traditional structural steel, through Ti alloying and the change of processing process, it develops high strength and corrosion resistant structural steel, which can provide reference for the subsequent development of Ti alloy structural steel.