A Hybrid Algorithm for Optimizing Machining and Spraying Parameters in MQL-Turning of Inconel 800H
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<div class="section abstract"><div class="htmlview paragraph">Inconel 800H superalloy is a difficult-to-turn material. This study aims to achieve optimal machining results, including reduced cutting force, improved surface roughness, and minimized residual stress, by optimizing input machining parameters like cutting speed, feed rate, spraying angle, and nozzle distance on Inconel 800H. The Taguchi L27 method is utilized for experimentation, while the Harris hawks optimizer (HHO) is applied in a multi-objective optimization model. Additionally, the Technique for Order of Preference by Similarity to the Ideal Solution (TOPSIS) is used to identify the optimal input parameters. Five distinct weight schemes were employed, including the Analytic Hierarchy Process (AHP), the Entropy weight method, Criteria Importance through Inter-Criteria Correlation (CRITIC), Grey relational analysis (GRA), and Principal Component Analysis (PCA) to determine response weights. The analysis revealed that the primary factor affecting all measured weights is the feed rate, with the nozzle angle closely followed, as determined by ANOVA, based on a comprehensive evaluation of all output responses. Notable enhancement in MQL turning when contrasted with dry turning, reflected in the output responses of roughness, force, and residual stress at 72.62%, 8.08%, and 19.32%, respectively, using AHP-TOPSIS compared to AHP-HHO.</div></div>Keywords:
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در این تحقیق از روش آسیاکاری مکانیکی برای ایجاد پوشش Ni-Al بر سطح سوپرآلیاژ پایه نیکلی(617 Inconel) استفاده‌شده است. در این روش بمنظور تشکیل پوشش، پودر Al و زیرلایه(617 Inconel) همراه با گلولههای با قطرهای متفاوت و نسبت وزنی گلوله به پودر متفاوت درون محفظه دستگاه آسیای سیارهای قرار گرفتند و عملیات آسیاکاری در زمانهای 5 و 10 و 15 و 20 ساعت انجام شد. در حین انجام فرآیند آسیاکاری در اثر برخورد متوالی گلولهها با ذرات پودر و سطح زیرلایه، پودر روی سطح زیرلایه جوش سرد خورده و پوشش تشکیل میشود. در مرحله بعد عملیات حرارتی در دمای°C 550 بر روی نمونهها انجام شد تا شرایط برای نفوذ و تشکیل ترکیبات بین فلزی مهیا شود. بمنظور به دست آوردن شرایط بهینه ضخامت و سختی پوشش از پارامترهای اندازه گلولهها، نسبت وزنی گلوله به پودر و زمان آسیاکاری استفاده شد. بررسی مورفولوژی و ترکیب پوششها با استفاده از میکروسکوپ الکترونی روبشی(SEM) و آنالیز طیف‌نگاری تفرق انرژی(EDS) انجام شد. نتایج پژوهش نشان داد، پوشش با ترکیب بین فلزی Ni-Al بر سطح زیرلایه(617 Inconel) تشکیل‌شده است. بهترین شرایط پوشش در زمان آسیاکاری 15 ساعت و نسبت وزنی گلوله به پودر 10:1 و با مخلوط گلولههای به قطر(8 و 12 و 16) میلیمتر ایجاد شد. ماکسیمم سختی پوشش 1270 ویکرز در زمان 15 ساعت آسیاکاری به دست آمد.
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두 가지 조성의 TiCrN 코팅층(Ti : Cr = 20 : 80 및 5 : 95wt%)을 Inconel 617 합금 위에 증착하고, 1000oC까지의 온도영역에서 TiCrN 코팅이 Inconel 617 합금의 고온안정성에 미치는 영향을 조사하였다. XRD 분석과 미세구조 관찰을 통해 표면으로의 불균일한 Cr 확산이 TiCrN 층에 의해 억제되었음을 알 수 있었다. 그 결과 Inconel 617의 열산화 저항성이 현저하게 향상되었음을 확인하였다. TiCrN layers (Ti : Cr = 20 : 80 and 5 : 95 wt%) were deposited on Inconel 617 and the effect of TiCrN coating on the high temperature stability of Inconel 617 up to $1000^{\circ}C$ was examined. XRD analysis and microstructural observation showed that vigorous and inhomogenous Cr diffusion to the surface was suppressed by TiCrN layer compare to the uncoated Inconel 617. This led to a distinctive enhancement in thermal oxidation resistance of Inconel 617.
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