Microstructure evolution and corrosion behavior of TC11 laser melt deposition additive components after post-heat treatment

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2023-11-24 DOI:10.1016/j.matchar.2023.113509

Wenshan Guo , Hui Zhang , Qingjun Zhou , Guangchun Xiao , Ning Guo , Wei Zhao , Gang Wang

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Abstract

The TC11 components were produced using a high-power, high-speed laser metal deposition (LMD) process. Subsequent post-heat treatment significantly improved the microstructures and corrosion resistance of the components. The results showed that the microstructure of the as-deposited component primarily comprised α Widmanstatten microstructure and mesh basket-weave microstructure. After post-heat treatment, the original interlayer zone disappeared in the deposition direction, and the microstructures were transformed from α’ to α phase. The aspect ratio of the α phase decreased, and the α grain boundary (α_GB) became spheroidized. The tensile strength decreased but plasticity increased significantly. Overall, the corrosion resistance was improved in both directions, with greater improvements observed in the deposition direction. Phase ratio, grain size and KAM value are all factors affecting the corrosion resistance, but for the deposited direction, the significant improvement of the corrosion resistance is mainly due to the weakening of the charged galvanic corrosion effect between the non-interlayer zone and interlayer zone.

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TC11激光熔融沉积增材构件热处理后的组织演变及腐蚀行为

TC11组件采用高功率、高速激光金属沉积(LMD)工艺生产。随后的后热处理显著改善了构件的显微组织和耐腐蚀性。结果表明:沉积组分的显微组织主要为α -魏氏组织和网状篮织组织;热处理后，沉积方向上原有的层间区消失，组织由α′向α相转变。α相长径比减小，α晶界(α gb)球化。拉伸强度降低，塑性显著提高。总的来说，两个方向的耐蚀性都有提高，其中沉积方向的提高更大。相比、晶粒尺寸和KAM值都是影响耐蚀性的因素，但就沉积方向而言，耐蚀性的显著提高主要是由于非层间区与层间区之间带电电腐蚀效应的减弱。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.