Effect of trace niobium on the microstructure and properties of full-pearlite steel used in the high-strength hypereutectoid wire rods

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-18 DOI:10.1016/j.jmrt.2024.09.145
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Abstract

The present study investigated the impact of 20–80 ppm Nb on the microstructure and properties of hypereutectoid pearlite steel. Remarkably, even trace amounts of Nb exhibited a favorable effect on the refinement of austenite grain. The addition of the Nb element resulted in a reduction of pearlite transition temperature, leading to a decrease of approximately 13% in lamellar spacing and 11% in the size of pearlite colonies. Furthermore, the dragging effect of the Nb element on the carbon atoms in hypereutectoid steel facilitated the control and refinement of network carbides. These findings offer valuable theoretical guidance for the production of ultra-high-strength wire rods. When the Nb content reached 80 ppm, it promoted the precipitation of (Ti, V)C, while simultaneously improving the morphology of square carbides. The grain refining strengthening mechanism accounted for about 70% of the overall strengthening effect observed in high carbon wire rods, with the influence of the Nb element primarily targeting grain refinement. Consequently, the incorporation of minute quantities of Nb presents a promising avenue for the development of ultra-high-strength hypereutectoid wire rods, offering significant potential for enhancing their strength properties.

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微量铌对高强度过共晶线材所用全珠光体钢微观结构和性能的影响
本研究探讨了 20-80 ppm Nb 对超共晶珠光体钢微观结构和性能的影响。值得注意的是,即使是微量的铌元素也会对奥氏体晶粒的细化产生有利影响。铌元素的加入降低了珠光体转变温度,使片层间距减少了约 13%,珠光体菌落大小减少了 11%。此外,铌元素对超共析钢中碳原子的拖曳作用促进了网络碳化物的控制和细化。这些发现为生产超高强度线材提供了宝贵的理论指导。当 Nb 含量达到 80 ppm 时,它促进了 (Ti, V)C 的析出,同时改善了方形碳化物的形态。晶粒细化强化机制约占高碳线材整体强化效果的 70%,Nb 元素的影响主要针对晶粒细化。因此,掺入微量的铌元素为开发超高强度过共晶线材提供了一条前景广阔的途径,为提高线材的强度性能提供了巨大的潜力。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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