The effects of hot rolling process on mechanical properties, corrosion resistance, and microstructures of Mo-Ni alloyed steels produced by powder metallurgy

IF 1.4 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Science of Sintering Pub Date : 2023-01-01 DOI:10.2298/sos230625040e

Rajab Elkilani, H. Çuğ, Akif Erden

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Abstract

This study examined the effects of hot rolling on the microstructure, tensile strength, and corrosion behaviors of three different alloy steels made by powder metallurgy: Fe-0.55C, Fe-0.55C-3Mo, and Fe-0.55C-3Mo-10Ni. 700 MPa pressure was applied to press the particles. The cold pressed samples were sintered in a mixed-gas atmosphere (90% nitrogen, 10% hydrogen) at 5?C/min up to 1400?C for 2 hours. Then, the produced steels were hot rolled with a deformation rate of 80%. The microstructures show that deformed Mo and Mo-Ni steels have finer microstructures, better mechanical properties than undeformed Mo and Mo-Ni steels, and MoC, MoN, or MoC(N) was formed in the Mo-Ni steels. The highest mechanical properties were obtained in rolled steel samples containing Mo-Ni, followed by rolled Mo steel and rolled carbon steel samples, and then unrolled samples. Additionally, Tafel curve analysis demonstrated that alloy corrosion resistance rose as Ni concentration increased. It has also been observed that the hot rolling process improves corrosion resistance. The increase in the density value with the rolling process emerged as the best supporter of corrosion resistance.

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热轧工艺对粉末冶金Mo-Ni合金钢力学性能、耐蚀性和显微组织的影响

本研究考察了热轧对粉末冶金制备的三种不同合金钢Fe-0.55C、Fe-0.55C- 3mo和Fe-0.55C- 3mo - 10ni的组织、抗拉强度和腐蚀行为的影响。施加700 MPa压力对颗粒进行压制。冷压样品在5℃的混合气体气氛(90%氮气，10%氢气)中烧结。C/min高达1400?2小时。然后，以80%的变形率进行热轧。显微组织表明，变形后的Mo和Mo- ni钢比未变形的Mo和Mo- ni钢具有更细的显微组织和更好的力学性能，并且在Mo- ni钢中形成了MoC、MoN或MoC(N)。含Mo- ni的轧制钢样品的力学性能最高，其次是轧制Mo钢和轧制碳钢样品，最后是未轧制样品。Tafel曲线分析表明，合金的耐蚀性随Ni浓度的增加而提高。还观察到热轧工艺提高了耐蚀性。随着轧制过程的增加，密度值的增加是耐蚀性的最佳支撑。

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来源期刊

Science of Sintering 工程技术-材料科学：硅酸盐

CiteScore

2.50

自引率

46.70%

发文量

审稿时长

3.3 months

期刊介绍： Science of Sintering is a unique journal in the field of science and technology of sintering. Science of Sintering publishes papers on all aspects of theoretical and experimental studies, which can contribute to the better understanding of the behavior of powders and similar materials during consolidation processes. Emphasis is laid on those aspects of the science of materials that are concerned with the thermodynamics, kinetics and mechanism of sintering and related processes. In accordance with the significance of disperse materials for the sintering technology, papers dealing with the question of ultradisperse powders, tribochemical activation and catalysis are also published. Science of Sintering journal is published four times a year. Types of contribution: Original research papers, Review articles, Letters to Editor, Book reviews.