Fracture toughness analysis of laser-beam-welded superalloys Inconel 718 and 625

Yeni Ç. E., Kocak M.

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, cilt.29, sa.7, ss.546-557, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 29 Sayı: 7
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1111/j.1460-2695.2006.01025.x
  • Dergi Adı: FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.546-557
  • Anahtar Kelimeler: CTOD, fracture toughness, laser-beam welding, R-curve, superalloy, LAVES PHASE, ALLOY 625, TENSILE
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this study, two 3.2-mm thick Ni-base superalloys, Inconel 718 and 625, have been laser-beam-welded by a 6-kW CO2 laser and their room temperature fracture toughness properties have been investigated. Fracture toughness behaviour of the base metal (BM), fusion zone (FZ) and heat affected zone (HAZ) regions was determined in terms of crack tip opening displacement (CTOD) using compact tension-type (C(T)) specimens. Laser-beam-weld regions showed no significant strength overmatching in both alloys. Ductile crack growth analysis (R-curve) also showed that both materials exhibited similar behaviour. Compared to the BM there is a slight decrease in fracture toughness of the fusion and the HAZ.