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Journals / Politeknik Dergisi / 2022 / Cilt: 25 - Sayı: 2

Optimization of Processing Parameters for Minimum Residual Stress and Maximum Wear Resistance During Gas Nitration of 4140 Steel

Gaz Nitrasyon Yapılan 4140 Çeliğinin Minimum Kalıntı Gerilim ve Maksimum Aşınma Dayanımı İçin İşlem Parametrelerinin Optimizasyonu

Sibel TÜZÜNER
Ali Baran METİN
Ebru SARALOĞLU GÜLER
Tuğçe ŞAHİN
Pages
909–920
Publication Date
2022-06-01
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

As a result of the study, it was observed that the maximum wear resistance and minimum residual stress values was obtained by the parameters of 470⁰C, 12h, 9m3/h.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Several surface treatments has been applied to the 4140 specimens which are exposed to frictional conditions like gears in order to increase the wear resistance and hardness.
📊
Key Findings & Data:The parameters of temperature, time, flow rate during nitration of SAE 4140 steels were optimized in this study.
💡
Conclusion & Impact:As a result of the study, it was observed that the maximum wear resistance and minimum residual stress values was obtained by the parameters of 470⁰C, 12h, 9m3/h.
🔬Design:Research Article
📍Scope:4140 specimens
⚙️Variables:Gaz Nitrasyon · SAE 4140 çeliği · aşınma dayanımı

Abstract

Several surface treatments has been applied to the 4140 specimens which are exposed to frictional conditions like gears in order to increase the wear resistance and hardness. Nitration is a common method to improve the hardness of the surfaces. However, the parameters must be chosen wisely. The parameters of temperature, time, flow rate during nitration of SAE 4140 steels were optimized in this study. The ranges for the parameters are selected as 470⁰C - 520⁰C - 570⁰C, 7h - 9h - 12h and 6m3/h - 7.5m3/h - 9m3/h for temperature, time and flow rate respectively. Residual stress, hardness and wear resistance were measured for the specific experiments together with microscopic observations. The nitration process of the threaded part was completed using the optimized parameters. As a result of the study, it was observed that the maximum wear resistance and minimum residual stress values was obtained by the parameters of 470⁰C, 12h, 9m3/h.

Özet

Dişliler gibi sürtünme koşullarına maruz kalan 4140 çeliği numunesinin aşınma direncini ve sertliğini arttırmak için çeşitli yüzey işlemleri uygulanmıştır. Nitrasyon, yüzeylerin sertliğini iyileştirmek için yaygın bir yöntemdir. Ancak, parametreler dikkatli bir şekilde seçilmelidir. Bu çalışmada SAE 4140 çeliklerinin nitrasyonu sırasında sıcaklık, zaman, debi parametreleri optimize edilmiştir. Parametre aralıkları sıcaklık, zaman ve debi için sırasıyla 470⁰C - 520⁰C - 570⁰C, 7sa – 9sa – 12sa and 6m3/sa - 7.5m3/sa - 9m3/sa olarak seçilmiştir. Mikroskobik gözlemlerle birlikte spesifik deneyler için kalıntı gerilim, sertlik ve aşınma direnci ölçülmüştür. Optimize edilmiş parametreler kullanılarak dişli parçanın nitrasyon işlemi tamamlanmıştır.Çalışma sonucunda maksimum aşınma direnci ve minimum kalıntı gerilim değerlerinin 470⁰C, 12sa, 9m3/sa parametreleri ile elde edildiği gözlemlenmiştir.

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Cite This Article

TÜZÜNER, S., METİN, A. B., GÜLER, E. S., ŞAHİN, T. (2022). Optimization of Processing Parameters for Minimum Residual Stress and Maximum Wear Resistance During Gas Nitration of 4140 Steel. Politeknik Dergisi, Cilt: 25 - Sayı: 2, 909–920. https://ajindex.com/articles/697074

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