东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (9): 102-112.DOI: 10.12068/j.issn.1005-3026.2025.20240019

• 机械工程 • 上一篇    下一篇

异质材料修复K403叶片界面组织及力学性能研究

任启震, 孟贵如, 巩亚东(), 李远峰   

  1. 东北大学 机械工程与自动化学院,辽宁 沈阳 110819
  • 收稿日期:2024-01-22 出版日期:2025-09-15 发布日期:2025-12-03
  • 通讯作者: 巩亚东
  • 作者简介:任启震(1998—),男,山西兴县人,东北大学硕士研究生
    巩亚东(1958—),男,辽宁本溪人,东北大学教授,博士生导师.

Study on Interface Microstructure and Mechanical Performance of K403 Blade Repaired with Heterogeneous Material

Qi-zhen REN, Gui-ru MENG, Ya-dong GONG(), Yuan-feng LI   

  1. School of Mechanical Engineering & Automation,Northeastern University,Shenyang 110819,China.
  • Received:2024-01-22 Online:2025-09-15 Published:2025-12-03
  • Contact: Ya-dong GONG

摘要:

以K403损伤叶片为基体,采用激光熔覆IN718合金粉末对熔覆层和基体结合的界面区域进行修复再制造.基于正交试验对激光熔覆IN718合金工艺进行优化,研究工艺参数对熔覆层成形尺寸和质量的影响规律,分析修复界面区域的组织特征以及裂纹形成机制.结果表明,裂纹从基体区萌生并向熔覆层扩展,裂纹萌生位置受熔池形状影响,裂纹数量与熔合区形貌相关;热处理后,熔覆层晶粒间的析出相由颗粒状Laves相转变为针状δ相,界面区域实现冶金结合;热处理对K403基体影响不大,但使界面区域硬度过渡更为平滑,熔覆层硬度提升近50%,热影响区宽度约为2.1 mm;抗拉强度达731.7 MPa,伸长率为3.7%,断裂类型是以脆性断裂为主的准解理断裂.

关键词: 激光熔覆, 异质材料, K403叶片, 界面组织, 力学性能

Abstract:

By taking K403 damaged blades as the substrate, IN718 alloy powder by laser cladding was used to repair and remanufacture the interface area between cladding layer and substrate. Based on the orthogonal tests, the laser cladding process for IN718 alloy was optimized, and the influence of the process parameters on the formation size and quality of the cladding layer was studied. The microstructure characteristics of the repaired interface area and the mechanism of crack formation were analyzed. The results show that cracks originate from the substrate regions and expand towards the cladding layer. The location of crack initiation is influenced by the shape of the molten pool, and the number of cracks is related to the morphology of the fusion zone. After heat treatment, the precipitates between the grains of the cladding layer transform from granular Laves phase to acicular phase δ. The interface area exhibits metallurgical bonding. The heat treatment has little effect on the K403 substrate, but it makes the hardness transition in the interface area smoother, and increases the hardness of the cladding layer by nearly 50%, the width of the heat affected zone is about 2.1 mm; the tensile strength is 731.7 MPa, and the elongation is 3.7%. The fracture type is a quasi-cleavage fracture dominated by brittle fracture.

Key words: laser cladding, heterogeneous material, K403 blade, interface microstructure, mechanical performance

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