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本文论述了钢的化学成分和热轧后冷却状况对其显微组织及机械性能的影响。生产多相钢最重要的一点是,通过添加Si、Cr合金元素和控制冷却获得期望的马氏体和奥氏体,净化铁素体晶粒。控制初始冷却速率会影响铁素体转变的数量、铁素体净化和残留奥氏体中碳的富集;控制第二冷却速率和卷取温度可改变低温转变产物的特性和溶于铁素体中的碳含量。Si可加速铁素体的转变和净化铁素体,而且可提高抗拉强度与延伸率的积。Cr可提高钢的淬透性和屈强比。轧钢厂对所推荐的C、Mn、Si、Cr成分的钢进行生产试验,是为了进一步证实在实验室得到的成分和工艺参数。还对这些三相钢板的应用如制造轮盘进行了试验。
This article discusses the influence of the chemical composition of steel and the post-hot-rolling cooling on the microstructure and mechanical properties. The most important point in producing multi-phase steels is to purify the ferrite grains by obtaining the desired martensite and austenite by adding Si and Cr alloying elements and controlling the cooling. Controlling the initial cooling rate will affect the amount of ferrite transformation, ferrite purification and carbon enrichment in the retained austenite; controlling the second cooling rate and the coiling temperature may alter the properties of the low temperature transformation product and dissolve in the ferrite In the carbon content. Si accelerates ferrite transformation and purifies ferrite, and can increase the product of tensile strength and elongation. Cr improves hardenability and yield strength of steel. Rolling mill production of the recommended C, Mn, Si, Cr steel production test is to further confirm the composition of the laboratory and process parameters. Applications of these three-phase plates, such as roulette, were also tested.