Grinding force prediction and surface integrity analysis of Ti‑4822 alloy formed by laser‑directed energy deposition

Release Time:2023-09-26 Hits:

First Author:Dingkun Xu
Correspondence Author:Bo Xin
Co author:Yadong Gong,Jiangyu Ren,Xiaoqi Wang
Title of Paper:Grinding force prediction and surface integrity analysis of Ti‑4822 alloy formed by laser‑directed energy deposition
Journal:International Journal of Advanced Manufacturing Technology
Summary:Ti-4822 TiAl alloy is a typical intermetallic compound with great potential applications in aeronautics and astronautics and is
widely available to high-pressure compressors and low-pressure turbine blades of aero-engines. Laser-directed energy deposition (LDED) is appropriate to form the Ti-4822 parts with complex shapes and structures. However, the LDED Ti-4822 alloy
is a typical hard-brittle and difficult machining material with a poor rough surface and thermal conductivity, leading to poor
grinding surface integrity. Therefore, in order to investigate and improve the grinding performance of LDED Ti-4822 alloy, a
new prediction model of grinding force was proposed based on the combination of single-grain grinding and dynamic active
grains grinding simulation. The influence of grinding parameters and grinding wheel category on grinding force, grinding
force ratio, grinding surface morphology, grinding debris, and microhardness of LDED Ti-4822 alloy was analyzed by the
single-factor and orthogonal experiments. The experimental results demonstrated that low feed speed, small grinding depth,
and high grinding speed are beneficial to reduce grinding force and surface roughness (minimum 0.19 μm). Compared with
the CBN wheel, the diamond wheel is more appropriate for grinding LDED Ti-4822 alloy because of a smoother grinding
surface with less defects and lower wheel wear. Significant surface hardening will be generated by grinding LDED Ti-4822
alloy. The maximum Vickers hardness can reach 776.6 HV, and the mean depth of grinding hardened layer is 20 μm.
Key Words:Ti-4822 · Laser-directed energy deposition (LDED) · Grinding force · Dynamic active grains · Surface integrity
Indexed by:SCI JCR Q2
Discipline:Engineering
Document Type:JCR 二区
First-Level Discipline:Mechanical Engineering
Translation or Not:No

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