Effect of multi-element synergistic addition on the microstructure evolution and performance enhancement of laser hot-wire cladded Fe-based alloy

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-11 DOI:10.1016/j.ijpvp.2024.105321

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引用次数: 0

Abstract

To satisfy the requirements of hardness and corrosion resistance for laser additive manufacturing of hydraulic supports, this study applied the synergistic addition of C, B, Cr, Ni, Nb and Mo elements in Fe-based alloys. The multi-phases, martensite + austenite + ferrite were designed. The microstructure, hardness and corrosion resistance of the coatings were analyzed. Increasing the C and B contents could significantly increase the hardness of the coatings, while the corrosion resistance was decreased. The corrosion resistance of the coatings was determined by the Cr contents. However, increasing the Cr contents to 20.0 wt % resulted in the ferrite structure with lower hardness (21 HRC). The coatings with 0.25 wt % C, 1.2 wt % B and 19.0 wt % Cr showed the optimal matching of hardness (56 HRC) and corrosion resistance (survived in neutral salt spray test≥300h). The resulted coatings were mainly consisted of dendritic structure. Fine lath martensite phase was dominant in the dendrite regions. The interdendritic regions were consisted of nano-sized intermetallics with a mixture of σ+Nb + FeNb + Cr₂Nb+(Fe,Cr)₂B + NbC compounds. These interdendritic regions (14.2 GPa) showed higher hardness than that of the dendritic regions (7.1 GPa). The high Cr contents with finer dendritic structures were the major mechanisms for the excellent combination of hardness and corrosion resistance. The precipitation and growth mechanisms of the interdendritic phases were elaborated. This work provides a valuable reference for laser hot-wire cladding to prepare Fe-based alloys with high hardness and excellent corrosion resistance.

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多元素协同添加对激光热丝包覆铁基合金微观结构演变和性能提升的影响

为满足激光增材制造液压支架对硬度和耐腐蚀性的要求，本研究在铁基合金中协同添加了 C、B、Cr、Ni、Nb 和 Mo 元素。设计了马氏体 + 奥氏体 + 铁素体的多相结构。分析了涂层的微观结构、硬度和耐腐蚀性。增加 C 和 B 的含量可显著提高涂层的硬度，但耐腐蚀性能却有所下降。涂层的耐腐蚀性由铬含量决定。然而，将铬含量提高到 20.0 wt % 会导致铁素体结构的硬度降低（21 HRC）。含 0.25 wt % C、1.2 wt % B 和 19.0 wt % Cr 的涂层显示出硬度（56 HRC）和耐腐蚀性（在中性盐雾试验中存活时间≥300 小时）的最佳匹配。所得涂层主要由树枝状结构组成。细板条马氏体相在树枝状区域占主导地位。树枝状晶间区域由纳米尺寸的金属间化合物组成，其中包含 σ+Nb + FeNb + Cr2Nb+(Fe,Cr)2B + NbC 化合物的混合物。这些树枝状区域（14.2 GPa）的硬度高于树枝状区域（7.1 GPa）。高铬含量和更精细的树枝状结构是硬度和耐腐蚀性出色结合的主要机制。研究还阐述了树枝状间相的析出和生长机制。这项研究为激光热丝熔覆制备具有高硬度和优异耐腐蚀性能的铁基合金提供了有价值的参考。

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.