Grain refinement and precipitation strengthening in austenitic steels through Cu addition

IF 4.1 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shuangle Zhang, Shangkun Shen, Liyu Hao, Xing Liu, Kunjie Yang, Jin Li, Jinlong Du, Shiwei Wang, Engang Fu
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引用次数: 0

Abstract

This study investigated the precipitation strengthening of chemically disordered Cu-rich phase and its effect on the mechanical properties of Cu-doped Fe18Cr14Ni3Mo austenitic steels. A high density of Cu-rich nanoprecipitates with fully coherent structure were formed in the austenitic matrix. These nano-sized Cu-rich nanoprecipitates improved the strength of alloys by hindering the movement of grain boundaries, revealing the disordering strengthening effect. Meanwhile, dense precipitates prevented grain growth, thereby improving grain refinement and further increasing the strength. Particularly, samples with Cu alloying exhibited a more pronounced grain refinement effect on grain-refined samples compared to ones without alloying, thus showing a more significant strengthening effect. The findings of this study not only offer guidance for the design of high-strength materials via disordering effects but also provide new insights in fabricating the ultrafine grain materials.

Impact statement

In this study, we successfully prepared forged austenitic steels with Cu-rich phases via a cold rolling process. Dense Cu-rich phases improved alloy strength by hindering dislocation movement and preventing grain growth, leading to grain refinement. The influence of Cu-rich phase precipitation on mechanical properties and microstructures of Fe18Cr14Ni3Mo4Cu austenitic steels, both virgin and grain-refined, was systematically analyzed and compared. Results showed that mechanical property enhancement in Cu-doped samples was mainly due to grain-refinement and precipitation strengthening. Notably, the role of Cu-rich phases in grain refinement became more significant after cold rolling. Compared to the grain-refined undoped Cu samples, the average grain size of the Cu-doped grain-refined samples was reduced by a factor of 3.2, and the yield strength was increased by a factor of 1.4, demonstrating the effect of Cu-rich phases in preventing grain growth and achieving grain refinement.

Graphical abstract

Abstract Image

通过添加铜实现奥氏体钢的晶粒细化和沉淀强化
摘要 本研究探讨了化学无序富铜相的沉淀强化及其对掺铜 Fe18Cr14Ni3Mo 奥氏体钢机械性能的影响。在奥氏体基体中形成了高密度的富铜纳米沉淀物,其结构完全一致。这些纳米尺寸的富铜纳米沉淀物通过阻碍晶界移动提高了合金的强度,显示了无序强化效应。同时,致密析出物阻止了晶粒长大,从而改善了晶粒细化,进一步提高了强度。特别是,与未加入合金的样品相比,加入了铜合金的样品在晶粒细化方面表现出更明显的晶粒细化效果,从而显示出更显著的强化效果。本研究的发现不仅为通过无序效应设计高强度材料提供了指导,而且为制造超细晶粒材料提供了新的见解。致密的富Cu相通过阻碍位错运动和阻止晶粒长大来提高合金强度,从而实现晶粒细化。我们系统地分析和比较了富铜相析出对 Fe18Cr14Ni3Mo4Cu 奥氏体钢(原始钢和晶粒细化钢)机械性能和微观结构的影响。结果表明,掺铜样品机械性能的提高主要归因于晶粒细化和沉淀强化。值得注意的是,冷轧后富铜相在晶粒细化中的作用变得更加显著。与晶粒细化的未掺杂 Cu 样品相比,掺杂 Cu 的晶粒细化样品的平均晶粒尺寸减小了 3.2 倍,屈服强度提高了 1.4 倍,这表明富 Cu 相在防止晶粒长大和实现晶粒细化方面发挥了作用。
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来源期刊
Mrs Bulletin
Mrs Bulletin 工程技术-材料科学:综合
CiteScore
7.40
自引率
2.00%
发文量
193
审稿时长
4-8 weeks
期刊介绍: MRS Bulletin is one of the most widely recognized and highly respected publications in advanced materials research. Each month, the Bulletin provides a comprehensive overview of a specific materials theme, along with industry and policy developments, and MRS and materials-community news and events. Written by leading experts, the overview articles are useful references for specialists, but are also presented at a level understandable to a broad scientific audience.
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