Titanium alloy microstructure fingerprint plots from in-process machining
Titanium alloy microstructure fingerprint plots from in-process machining
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DOI：
10.1016/j.msea.2021.141074
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发表时间：
2021-03-19
期刊：
影响因子：
6.4
通讯作者：
Jackson, M.
中科院分区：
文献类型：
--
作者：
Fernandez, D. Suarez;Wynne, B. P.;Jackson, M.
钛合金部件需要锻造坯料的多个加工阶段，这些锻造坯料在一系列退火条件下供应。通常，加工性能受热处理的影响，并且坯料显微组织的变化经常被工具制造商和机械师忽视。由于初锻过程中的非线性应变路径，钛合金坯料具有各向异性的性质，因此在制造阶段需要进行非原位无损评估（NDE），以确保优异的使用性能，特别是在安全关键的航空航天部件中。在这项研究中，在端面车削操作过程中的力响应中出现的波动的局部分析直接与坯料热处理条件相关联，并以微观结构指纹图的形式呈现。切削力的演变在四个不同的坯料条件下的α + β钛合金Ti？6Al？2Sn？4Zr？6Mo（Ti-6246）。力的大小和波动与热处理产生的微观结构特征直接相关。此外，局部空间高分辨率同步的切削力被用来确定从异质上游锻造过程和随后的热处理的微观结构的影响。这些快速生成的微观结构指纹图是为制造商提供过程中加工NDE方法的重要开发步骤：这将有助于在昂贵的二次锻造或精加工阶段之前对上游材料进行鉴定。
Titanium alloy components require several machining stages of forged billets which are supplied in a range of annealing conditions. Generally, the machining performance is influenced by the heat treatment and changes in billet microstructures are often overlooked by tool manufacturers and machinists. Due to the non-linear strain path during primary forging, titanium alloy billets are anisotropic in nature and require ex-situ non-destructive evaluation (NDE) during the manufacturing stages to ensure excellent service performance, particularly in safetycritical aerospace components. In this study, the local analysis of the fluctuations presented in the force response during face-turning operations is directly linked to the billet heat treatment condition and presented as microstructure fingerprint plots. The evolution of cutting forces in four different billet conditions of the alpha + beta titanium alloy Ti?6Al?2Sn?4Zr?6Mo (Ti-6246) was measured. The magnitude and fluctuations in force were directly correlated to microstructural features derived from the heat treatments. In addition, local spatial highresolution synchronization of the cutting forces was used to determine the effects of microstructure from the heterogeneous upstream forging process and subsequent heat treatment. These rapidly produced microstructure fingerprint plots are an important development step for providing manufacturers with an in-process machining NDE method: this will help to qualify material upstream prior to expensive secondary forging or finish machining stages.