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本文研究了不同Ti含量对钒钛微合金化汽车大梁钢力学性能的影响。试验结果表明,在本试验范围,Ti含量(0.02—0.15％)对强度的影响分三个阶段:微Ti时(<0.04％),强度变化较小;在0.04—0.08％范围,强度随Ti含量增加而显著升高;Ti达0.08—0.15％时,强度增加趋平缓。不同Ti含量范围,Ti的主要作用机理不同:微Ti时起细化晶粒作用,较高Ti时起强烈沉淀强化作用,同时改善硫化物夹杂形态。分析认为细小弥散分布的TiC析出强化是强度变化的主要原因。根据本文的试验结果的化学成分提出合理的建议,为长钢开发的汽车大梁用钢新产品的化学成分设计提出了合理的建议。
In this paper, the effect of different Ti content on the mechanical properties of vanadium-titanium microalloyed automotive girder steel was studied. The experimental results show that the influence of Ti content (0.02-0.15%) on strength is divided into three stages in the scope of this test: the micro-Ti (<0.04%), the change of strength is small; in the range of 0.04-0.08% Content increased significantly increased; Ti 0.08-0.15%, the intensity increase tends to be gentle. Different Ti content range, the main mechanism of action of Ti is different: micro-Ti grain refinement from the time of the role of strong precipitated strengthening of Ti, while improving the sulfide inclusions. It is considered that the main reason for the change of strength is TiC precipitation strengthening with small and diffuse distribution. Based on the chemical composition of the test results, reasonable suggestions are put forward to provide reasonable suggestions for the chemical composition design of new steel products for automobile girders developed by Chang Steel.