Scopus
🔓 Açık Erişim YÖKSİS Eşleşti
Cyclic Oxidation Behavior and Protective Oxide Scale Formation in Stainless-Steel Alloys for High-Temperature Exhaust Valve Applications
Coatings · Eylül 2025
YÖKSİS Kayıtları
Cyclic Oxidation Behavior and Protective Oxide Scale Formation in Stainless-Steel Alloys for High-Temperature Exhaust Valve Applications
Coatings · 2025 SCI-Expanded
DOÇENT EMİN SALUR →
Makale Bilgileri
DergiCoatings
Yayın TarihiEylül 2025
Cilt / Sayfa15
Scopus ID2-s2.0-105017241477
Erişim🔓 Açık Erişim
Özet
As internal combustion engine (ICE) systems are increasingly exposed to severe thermal and oxidative environments, the oxidation resistance and structural integrity of exhaust valve materials have become critical for maintaining long-term engine reliability and efficiency. This study presents a comparative evaluation of the cyclic oxidation behavior of two candidate valve steels, 1.4718 (ferritic stainless steel) and 1.4871 (austenitic stainless steel), under service-temperature conditions. The specimens were exposed to repeated oxidation at 550 °C, 650 °C and 750 °C for 25 cycles in ambient air. The surface and cross-sectional morphologies of the oxide layers were analyzed using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) to investigate oxide scale composition, thickness, and growth characteristics. The oxidation behavior of both alloys proceeded in two distinct stages: an initial phase marked by accelerated oxidation, followed by a slower, more stable growth period. The extent of oxidation intensified with increasing temperature. The 1.4718 alloy developed relatively porous but compositionally stable oxide layers consisting primarily of Fe- and Cr-based spinels such as FeCr<inf>2</inf>O<inf>4</inf> and Cr<inf>2</inf>SiO<inf>4</inf>. In contrast, the 1.4871 alloy formed a dense, adherent, dual-layered oxide scale composed of an outer Mn<inf>2</inf>O<inf>3</inf>-rich layer and an inner Cr<inf>2</inf>O<inf>3</inf>-rich layer, attributable to its high Mn and Cr content. The results underscore the critical influence of elemental composition, particularly Cr, Mn and Si, on oxide scale stability and spallation resistance, demonstrating the superior cyclic oxidation resistance of the 1.4871 alloy and its potential suitability for exhaust valve applications in thermally aggressive environments.
Yazarlar (9)
1
S. Bilal Çetinkal
ORCID: 0000-0001-6212-7670
2
Mehmet Şahin Ataş
ORCID: 0000-0001-8361-5913
3
Emin Salur
4
İlyas Şavklıyıldız
ORCID: 0000-0001-7903-9220
5
Halit Sübütay
6
Gökhan Arici
7
Abdulaziz Kurdi
ORCID: 0000-0002-9247-7353
8
Ahmed Degnah
9
Abdulaziz AlHazaa
ORCID: 0000-0002-6213-6662
Anahtar Kelimeler
1.4718
1.4871
microstructure
oxidation
SEM
Kurumlar
King Abdulaziz City for Science and Technology
Riyadh Saudi Arabia
King Saud University
Riyadh Saudi Arabia
Konya Technical University
Konya Turkey
Selçuk Üniversitesi
Selçuklu Turkey