Laser cladding of diamond reinforced composite coatings on the rotary tiller blade with complex curved surface: Cladding paths and residual stress

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-09-26 DOI:10.1016/j.surfcoat.2025.132734

Taitong Jin , Yasong Shi , Jiawei Ding , Yong Wang , Songhao Hu , Wei Zhang , Yingbo Peng

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引用次数: 0

Abstract

Laser cladding (LC) exhibits great potential in reinforcing soil-engaging parts of tillage machinery. However, for typical soil-engaging parts with complex curved surfaces like the rotary tiller blade, it is imperative to address discontinuity and residual stress of the coatings-key issues caused by improper cladding paths and curvature-induced uneven distribution of laser energy, which limit the performance of LC coatings. In the presented study, Ni60-diamond composite coatings were fabricated on the rotary tiller blades with complex curved surface by LC. Based on the relationship between LC parameters, microstructures and properties, the Ni60-diamond composite coating with good LC formability, non-graphitization of diamond, strong abrasive retention force and high wear resistance were obtained by the LC parameters of P = 1000 W, v = 10 mm/s. Then, by establishing the high-precision model (error of 0.382 mm) of rotary tiller blade, three cladding paths were designed as 0°, 45° and 90° along the blade edge direction, and the optimized composite coatings were prepared according to the cladding path on the rotary tiller blades. Through simulation and experiments, with the increasing curvature, the residual stress of the coating increased due to the uneven spatial distribution of thermal stress in the laser spot. The residual stress of the coating reached 68.8 MPa at the maximum curvature of 1/25 mm⁻¹, exhibiting through-cracks across the coating. On the other hand, with the increase of number of laser-scanning passes, the residual stress of 45°-and 90°-path coatings increased significantly under the effect of heat accumulation, 25–35 % more than the 0°-path coating. This study not only provides technical basis for preparing wear-resistant coatings on soil-engaging parts, but also proposes a strategy for the reinforcing, repairing and remanufacturing of the complex parts by LC.

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复杂曲面旋耕机叶片激光熔覆金刚石增强复合涂层：熔覆路径与残余应力

激光熔覆（LC）在耕作机械与土壤接触部件的加固方面显示出巨大的潜力。然而，对于旋耕机叶片等具有复杂曲面的典型与土接触部件，涂层的不连续和残余应力是解决涂层的关键问题，这是由于熔覆路径不当和曲率引起的激光能量分布不均匀造成的，这限制了LC涂层的性能。采用液相色谱法在复杂曲面旋耕机叶片上制备了ni60 -金刚石复合涂层。基于LC参数、显微组织与性能之间的关系，在P = 1000 W、v = 10 mm/s的LC参数下，获得了具有良好LC成形性、金刚石无石墨化、强磨粒保留力和高耐磨性的ni60 -金刚石复合涂层。然后，通过建立旋耕机叶片的高精度模型（误差为0.382 mm），设计了沿叶片边缘方向0°、45°和90°3条包覆路径，并根据包覆路径制备了优化后的复合涂层。通过仿真和实验发现，随着曲率的增大，由于激光光斑处热应力空间分布的不均匀，涂层的残余应力增大。在最大曲率为1/25 mm−1时，涂层的残余应力达到68.8 MPa，涂层上出现了穿透裂纹。另一方面，随着激光扫描次数的增加，45°和90°路径涂层在热积累作用下的残余应力显著增加，比0°路径涂层高25 - 35%。本研究不仅为在含土零件上制备耐磨涂层提供了技术依据，而且为复杂零件的LC加固、修复和再制造提供了策略。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.