Investigation of the Interaction of Wear Resistance of Hastelloy C-22 Super Alloy with Cryogenic Process for Usability in Machine Construction

Abstract

The parts to be used in machine construction must have high wear, fatigue and corrosion resistance. Hastelloy C-22 superalloy draws attention with its high corrosion resistance, but its constructive use is limited due to insufficient wear resistance. In this study, deep and shallow cryogenic treatment was applied to Hastelloy C-22 superalloy to improve wear resistance. Before the wear test, XRD analysis, hardness measurement and microstructure imaging were performed for metallurgical characterization. The cryogenic treated samples were brought to room temperature for 6 hours after being kept at cryogenic treatment application temperatures for 24 hours. The samples brought to room temperature were tempered at 200 ºC for 2 hours. In the hardness measurements made after heat treatment, it was determined that the hardness value of the deep cryogenic treated sample increased by 45%, and the hardness value of the shallow cryogenic treated sample increased by 14%. Wear tests were carried out according to ASTM G133 standard using the ball-on-flat type method that moves back and forth linearly, a force of 10 N, 20 N and 40 N was applied to all samples at a constant sliding speed of 72 mm/s at a total sliding distance of 1000 m. As a result of wear tests, volumetric loss was 24% in shallow cryogenic treatment and 44% in deep cryogenic treatment.

Keywords

• Cryogenic treatment
• Hastelloy C-22
• Hardness
• Wear
• Microstructure

MAKİNE KONSTRÜKSİYONUNDA KULLANILABİLİRLİK İÇİN HASTELLOY C-22 SÜPER ALAŞIMININ AŞINMA DİRENCİNİN KRİYOJENİK İŞLEM İLE ETKİLEŞİMİNİN İNCELENMESİ

Abstract

Makine konstrüksiyonunda kullanılacak parçaların aşınma, yorulma ve korozyon dirençlerinin yüksek olması önem taşımaktadır. Hastelloy C-22 süperalaşımı yüksek korozyon direnciyle dikkat çekmekte fakat aşınma dayanımının yetersizliği nedeniyle konstrüktif kullanımı sınırlı kalmaktadır. Bu çalışmada, Hastelloy C-22 süper alaşımına, aşınma direncini iyileştirebilmek amacıyla derin ve sığ kriyojenik işlem uygulanmıştır. Aşınma deneyi öncesi metalurjik karakterizasyon amacıyla XRD analizleri, sertlik ölçümü ve mikroyapı görüntülemesi yapılmıştır. Kriyojenik işlem uygulanmış numuneler, kriyojenik işlem uygulama sıcaklıklarında 24’er saat bekletildikten sonra oda sıcaklığına 6 saatlik bir sürede getirilmiştir. Oda sıcaklığına getirilen numunelere 200 ºC ‘de 2 saat süreyle temperleme işlemi uygulanmıştır. Isıl işlem sonrası yapılan sertlik ölçümlerinde, derin kriyojenik işlem uygulanmış numunenin sertlik değerinin %45 oranında, sığ kriyojenik işlem uygulanmış numunenin sertlik değerinin ise %14 oranında arttığı tespit edilmiştir. Aşınma deneyleri ASTM G133 standartına göre doğrusal olarak ileri geri hareket eden pim üzeri plaka (ball-on flat) tipi metoduyla, tüm numunelere 10 N, 20 N ve 40 N kuvvet uygulanarak 72 mm/s sabit kayma hızında toplamda 1000 m kayma mesafesinde gerçekleştirilmiştir. Aşınma deneyleri sonucunda, sığ kriyojenik işlemde %24, derin kriyojenik işlemde ise %44 oranında hacimsel kayıp gerçekleşmiştir.

Keywords

• Kriyojenik işlem
• Hastelloy C-22
• Sertlik
• Aşınma
• Mikroyapı

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