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本文根据国内外文献资料综述了低碳微合金钢中形成细晶粒铁素体与弥散分布的碳(氮)化合物组织的强韧化机理。通过控制轧制,得到理想的奥氏体状态,使随后转变的铁素体晶粒细化(5—10μm)。微合金碳(氮)化合物是在γ→α相变时采取相界面沉淀方式析出,或者在γ→α相变后,直接从过饱和铁素体中析出。这种组织的强韧化,主要依靠铁素体晶粒细化,而第二相的沉淀强化往往会降低韧性。
In this paper, based on the literature at home and abroad, the mechanism of strengthening and toughening the microstructure of fine carbon ferrite and dispersed carbon (nitrogen) compounds in low carbon microalloyed steel is reviewed. By controlling the rolling, the desired austenitic state is obtained, and the subsequently transformed ferrite grains are refined (5-10 μm). The micro-alloyed carbon (nitrogen) compounds are precipitated by interfacial precipitation during the γ → α transformation or precipitated directly from the supersaturated ferrite after γ → α transformation. The toughening of such an organization mainly depends on the grain refinement of ferrite, while the precipitation strengthening of the second phase tends to reduce the toughness.