Investigating the Effects of Repair Welding on Microstructure, Mechanical Properties, and Corrosion Behavior of IN-939 Superalloy

Mashhuriazar A., Badihehaghdam M., GÜR C. H., ERTÜRK M. T., BATIGÜN C., TİRKEŞ S., ...Daha Fazla

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, cilt.32, sa.15, ss.7016-7028, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32 Sayı: 15
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1007/s11665-022-07596-5
  • Dergi Adı: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.7016-7028
  • Anahtar Kelimeler: hot corrosion, hot tensile strength, inconel 939, polarization, repair welding, HEAT-AFFECTED ZONE, ISOTHERMAL SOLIDIFICATION COMPLETION, NI-BASED SUPERALLOY, LIQUATION CRACKING, IN939 SUPERALLOY, INCONEL, ALLOY, PHASE, RESISTANCE, EVOLUTION
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

This study aimed to investigate the effects of tungsten inert gas (TIG) repair welding on microstructure, mechanical properties, and corrosion resistance of Inconel 939. After welding with Inconel 625 filler under argon atmosphere, the microstructure, hardness, tensile strength, and corrosion resistance of the specimens were analyzed. The results showed that the hardness value and corrosion resistance decreased in the heat-affected zone and particularly in the fusion zone. These changes were attributed to a decrease in the amount of gamma' phase in the fusion zone, the generation of liquation cracking, and the accumulation of dislocations. Also, the cyclic hot corrosion tests were conducted on the specimens prepared from the base metal and the weldment in a synthetic molten salt environment for 30 h at 900 degrees C, which corresponds to the operating temperature. The results showed that although the weldment remained unchanged by the end of the test, in contrast, the base metal began to change after initial cycles, and a brittle oxide layer formed on the surface. Finally, the results of hot tensile tests performed at 900 degrees C showed that TIG welding has limited effects on yield strength and elongation. Welding reduced the yield strength and elongation as much as 4 and 47%, respectively, of those of the BM.