Microstructure and mechanical properties study of friction stir processed GH4169 via laser deposition manufacturing

IF 2.6 3区材料科学 Q2 ENGINEERING, MANUFACTURING

International Journal of Material Forming Pub Date : 2025-04-21 DOI:10.1007/s12289-025-01900-z

Changfu Li, Bin Yu, Siyu Zhou, Yuhang Ren, Dezhi Wang, Guang Yang

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引用次数: 0

Abstract

The coarse columnar crystals and inter-dendritic Laves phases of laser deposition manufactured (LDM) GH4169 are the two the primary reasons for the undesirable strength and plasticity compatibility and anisotropy of the alloy. In this study, we used friction stir processing (FSP) on LDMed GH4169 samples, the microstructure difference between the FSP zone and the LDM zone were compared, the microstructure refinement process in the FSP zone were analyzed, and the mechanism of microstructure refinement and its influence on the properties of the room-temperature tensile properties were proposed. The results show that fine equiaxed grains with an average grain size of ~ 3.13 μm were obtained in the stir zone (SZ) due to intense plastic deformation and recrystallization processes.The size and shape of the Laves phase changed significantly after FSP, the Laves phase fragmented in the thermo-mechanically affected zone (TMAZ), distributed in long strips along the rotational direction of the tool, and distributed as small particles in the SZ; while the MC-type carbides precipitation exhibited no significant change.The strength and plasticity of the FSP samples were significantly improved relative to the LDM samples, the yield strength and tensile strength reached 546 MPa and 1063 MPa, respectively, and the elongation reached 43%. Numerous strengthening mechanisms to increase the yield strength of the materials are analyzed and calculated in detail.

查看原文本刊更多论文

激光沉积制备搅拌摩擦加工GH4169的显微组织和力学性能研究

激光沉积（LDM） GH4169的粗柱状晶和枝晶间Laves相是导致合金强度塑性相容性和各向异性不理想的两个主要原因。本研究采用搅拌摩擦处理（FSP）对LDMed GH4169试样进行处理，比较了FSP区与LDM区的组织差异，分析了FSP区组织细化过程，提出了组织细化的机理及其对室温拉伸性能的影响。结果表明：在搅拌区（SZ），由于剧烈的塑性变形和再结晶过程，获得了平均晶粒尺寸为~ 3.13 μm的细小等轴晶；FSP后Laves相的大小和形状发生明显变化，Laves相在热机械影响区（TMAZ）破碎，沿刀具旋转方向呈长条状分布，在SZ呈小颗粒状分布；mc型碳化物析出变化不明显。FSP试样的强度和塑性较LDM试样有明显提高，屈服强度和抗拉强度分别达到546 MPa和1063 MPa，伸长率达到43%。对提高材料屈服强度的多种强化机制进行了详细的分析和计算。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.10

自引率

4.20%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material. The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations. All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.