高温合金短电弧辅助铣削表面完整性演化研究

doi:10.3901/JME.2024.09.434

机械工程学报 ›› 2024, Vol. 60 ›› Issue (9): 434-444.doi: 10.3901/JME.2024.09.434

• 其他能场辅助加工 • 上一篇

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高温合金短电弧辅助铣削表面完整性演化研究

王湃¹, 白翌帆², 赵文祥¹, 张毅博³, 刘志兵¹

1. 北京理工大学机械与车辆学院北京 100081;
2. 北京计算机技术及应用研究所北京 100854;
3. 北京动力机械研究所北京 100074

收稿日期:2023-08-10 修回日期:2023-12-04 出版日期:2024-05-05 发布日期:2024-06-18
作者简介:王湃，男， 1997 年出生，博士研究生。主要研究方向为难加工材料高速精密切削技术。E-mail： wangpai2020@bit.edu.cn;刘志兵(通信作者)，男， 1977 年出生，博士，教授，博士研究生导师。主要研究方向为难加工材料高速高效加工技术、复杂异形结构智能加工与检测技术。E-mail： liuzhibing@bit.edu.cn
基金资助:
国家自然科学基金资助项目(52075042)。

Research on Surface Integrity Evolution of Short Arc Assisted Milling of Superalloy

WANG Pai¹, BAI Yifan², ZHAO Wenxiang¹, ZHANG Yibo³, LIU Zhibing¹

1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081;
2. Beijing Institute of Computer Technology and Applications, Beijing 100854;
3. Beijing Power Machinery Institute, Beijing 100074

Received:2023-08-10 Revised:2023-12-04 Online:2024-05-05 Published:2024-06-18

摘要/Abstract

摘要： 短电弧铣削加工技术因低加工应力、低成本、高加工效率而被应用在镍基高温合金加工中。针对短电弧辅助精密铣削加工表面完整性演化规律不明的问题，利用扫描电子显微镜(SEM)、能量色散X射线谱(EDS)等检测手段分析了重铸层的组织特性，开展正交铣削试验研究了精密铣削工艺参数对表面完整性的影响规律以及重铸层导致的铣削表面差异，探究了短电弧辅助精密铣削表面强化机制。结果表明，高温合金晶体在高温下破坏重组导致其组织变化形成重铸层，硬度降低34%，脆性增强；相同参数下短电弧辅助铣削表面表现出更高的粗糙度值(Ra=0.76 μm)、更高的表面硬化率(47.8%)与更大的残余拉应力值(沿进给方向(X向)为241.5 MPa，垂直进给方向(Y向)为78 MPa)。加工表面硬化的主要机制是位错强化，通过引入核心平均取向差参数建立的显微硬度预测模型进一步拓展了表面完整性与晶体学特征的关系。

关键词: 短电弧, 重铸层, 表面完整性, 显微硬度, 表面强化

Abstract: Short arc milling technology is applied to nickel-based superalloy processing due to low machining stress, low cost and high machining efficiency. Aiming at the problem that the evolution law of surface integrity in short arc assisted precision milling is unclear, the microstructure characteristics of the recast layer are analyzed by means of scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and other detection methods. The influence of precision milling process parameters on surface integrity and the difference of milling surface caused by the presence of recast layer are studied by orthogonal milling experiments. The surface strengthening mechanism of short arc assisted precision milling is clarified. The results show that the destruction and recombination of the superalloy crystal at high temperature leads to its microstructure change to form a recast layer, the hardness is reduced by 34%, and the brittleness is enhanced. Under the same parameters, the surface of short arc assisted milling shows higher roughness (Ra=0.76 μm), higher surface hardening rate (47.8%), and larger tensile residual stress (along the feed direction (X direction) is 241.5 MPa, and in the vertical feed direction (Y direction) is 78 MPa). Dislocation strengthening is the main mechanism of machined surface hardening. The microhardness prediction model established by introducing the kernel average misorientation parameter further expands the relationship between surface integrity and crystallographic characteristics.

Key words: short arc, recast layers, surface integrity, microhardness, surface strengthening

中图分类号:

TG661

王湃, 白翌帆, 赵文祥, 张毅博, 刘志兵. 高温合金短电弧辅助铣削表面完整性演化研究[J]. 机械工程学报, 2024, 60(9): 434-444.

WANG Pai, BAI Yifan, ZHAO Wenxiang, ZHANG Yibo, LIU Zhibing. Research on Surface Integrity Evolution of Short Arc Assisted Milling of Superalloy[J]. Journal of Mechanical Engineering, 2024, 60(9): 434-444.

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高温合金短电弧辅助铣削表面完整性演化研究

Research on Surface Integrity Evolution of Short Arc Assisted Milling of Superalloy

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