Analysis of corrosion resistance when turning martensitic stainless steel X20Cr13 under chilled air-cooling

Abstract

Amongst different methods of cooling in machining, application of air is considered to be the cleanest and most environmentally friendly one. The aim of this paper was to explore the possibility of chilled air-cooling considering the corrosion resistance when turning martensitic stainless steel X20Cr13. Thus, a comparison between an alternative cooling technique where compressed air is refrigerated and jetted to the cutting zone by means of Ranque-Hilsch counter-flow vortex tube and the conventional flood cooling with oil-in-water emulsion was done. The corrosion resistance was determined by electrochemical testing and the surface condition was analysed with both Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS). From the results presented herein, it can be concluded that the specimen cooled with chilled air has better resistance to corrosion activity after a certain longer time in relation to the specimen cooled with emulsion. In addition, the specimen cooled with chilled air has lower surface roughness, which has a positive effect on the corrosion resistance. Hence, in the scope of environmentally friendly machining the vortex tube based chilled air-cooling can be successfully applied when turning difficult-to-cut martensitic stainless steel. Procedia Engineering, Vol. 132, 413-418, doi: 10.1016/j.proeng.2015.12. 513. [5] Boswell, B. (2008. Use of air-cooling and its effectiveness in dry machining processes, PhD thesis, Curtin University, Australia. Vol. 47, No. 3-4, 635-645, doi: 10.1016/ j.ijmachtools.2006 Liu, N.-M., Chiang, K.-T., Hung, C.-M. (2013). Modeling and analyzing the effects of air-cooled turning on the machinability of Ti-6Al-4V titanium alloy using the cold air gun coolant system,

Vorteks Soğutma Yöntemi̇ni̇n Talaşli İmalat Yöntemleri̇ Ve Kesme Parametreleri̇ne Göre İncelenmesi̇

“…Süper alaşımlar için yapılan çalışmalarda, kriyojenik soğutmanın vorteks tüpü ile soğutmadan daha düşük yüzey pürüzlülüğü ve daha az takım aşınması sağlayacağını belirtmişlerdir [36]. Çelik, Ti ve Al alaşımlarının yanında vorteks tüpünün dökme demir [27] ve paslanmaz çelik [42] için de kesme sıcaklığını büyük ölçüde azalttığını vurgulamışlardır.…”

Statistical Analysis of Corrosion Process Flow

“…corrosion damage, can be characterized as a spontaneous heterogeneous chemical process in which the reactants are the environment (one or more of its components) and the structural material. Depending on the conditions of the processes, the products of the mentioned mechanisms also differ and may be of solid, gaseous or dissolved character [1][2][3][4][5][6][7][8][9][10].…”