通过在低密度钢中添加 TiC 增强弹性模量

IF 1.6 4区 材料科学 Q2 Materials Science Transactions of The Indian Institute of Metals Pub Date : 2024-09-09 DOI:10.1007/s12666-024-03452-3
R. Pavan Kumar, N. C. Santhi Srinivas, R. Manna
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摘要

本研究探讨了原位强化 TiC 对奥氏体低密度钢的微观结构、密度和拉伸性能的影响。将成分为 Fe-18.93%Mn-6.20%Al-0.76%C 的低密度钢(钢 A)和成分为钢 A 但添加了 2.5%Ti 和 0.5%C 的低密度钢通过感应熔化并浇铸到铜模中,分别得到钢 A 中的奥氏体和钢 B 中的奥氏体加原位形成的 4.5 Vol% TiC。两种均质钢都经过热轧,然后在水中固溶和淬火。奥氏体钢 A 的密度和杨氏模量分别为 6.99 g/cc 和 169 GPa。奥氏体钢 B 中含有 4.5 Vol% 的 TiC,密度降至 6.84 g/cc,但杨氏模量增至 176 GPa,屈服强度增至 578 MPa,抗拉强度增至 920 MPa。尽管固溶强化是主要的强化方式,但由于奥氏体尺寸的细化和位错强化,TiC 的原位形成显著增加了晶界强化。由于延展性降低,TiC 的形成将强度和伸长率的乘积 (PCE) 降低到 32.5 GPa%。这两种钢均表现出路德维希逊流动行为,在真实应力-真实应变曲线图中分别呈现出易于滑动和交叉滑动的两个不同斜率。
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Enhancement of Elastic Modulus by TiC Reinforcement in Low-Density Steel

The present study investigates the effect of in situ reinforced TiC on the microstructure, density, and tensile properties of austenitic low-density steel. Low-density steels with compositions of Fe-18.93%Mn-6.20%Al-0.76%C (Steel A) and composition of steel A, with the addition of 2.5 %Ti and 0.5 %C are melted via induction melting and cast into copper mold to get austenite in steel A and austenite plus in-situ formation of 4.5 vol% TiC in Steel B, respectively. Both the homogenized steels are subjected to hot rolling followed by solutionizing and quenching in water. The austenitic Steel A reports low density and Young’s modulus of 6.99 g/cc and 169 GPa, respectively. The presence of 4.5 vol% TiC in austenitic Steel B reduces density to 6.84 g/cc but increases Young’s modulus to 176 GPa, yield strength to 578 MPa, and tensile strength to 920 MPa. In situ formation of TiC increases grain boundary strengthening due to refinement in austenite size and dislocation strengthening significantly even though solid solution strengthening is the dominating one. Formation of TiC reduces the product of strength and elongation (PCE) to 32.5 GPa% due to a decrease in ductility. Both steels exhibit Ludwigson flow behavior, characterized by two distinct slopes of easy glide and cross-slip, respectively, in true stress–true strain plots.

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来源期刊
Transactions of The Indian Institute of Metals
Transactions of The Indian Institute of Metals Materials Science-Metals and Alloys
CiteScore
2.60
自引率
6.20%
发文量
3
期刊介绍: Transactions of the Indian Institute of Metals publishes original research articles and reviews on ferrous and non-ferrous process metallurgy, structural and functional materials development, physical, chemical and mechanical metallurgy, welding science and technology, metal forming, particulate technologies, surface engineering, characterization of materials, thermodynamics and kinetics, materials modelling and other allied branches of Metallurgy and Materials Engineering. Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. The technical content of the journal is scrutinized by the Editorial Board composed of experts from various disciplines of Metallurgy and Materials Engineering. Editorial Advisory Board provides valuable advice on technical matters related to the publication of Transactions.
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