Effects of post-weld heat treatment on the microstructural evolution and mechanical properties of dissimilar friction stir welded AA6061+SiCp/AA6061-O joint


Öztoprak N., Yeni Ç. E., Gören Kıral B.

LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES, cilt.15, sa.8, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 15 Sayı: 8
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1590/1679-78254553
  • Dergi Adı: LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Friction Stir Welding, Metal Matrix Composites, Post-weld Heat Treatment, Mechanical Properties, TOOL PIN PROFILE, ALUMINUM-ALLOY, MATRIX COMPOSITE, TENSILE-STRENGTH, BEHAVIOR, WEAR, OPTIMIZATION, GENERATION, PARTICLES, AA7075
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

A research on the microstructure and mechanical properties of the dissimilar joint was carried out so as to understand the effects of post-weld heat treatment (PWHT) on microstructural evolution, microhardness, tensile and flexural properties of the dissimilar friction stir welded (FSWed) joint. The results showed that there is a sufficient and rather complicated material mixing in the nugget zone (NZ). After PWHT, the grains in the joint area except for the NZ demonstrated a grain refinement with more homogeneous and equiaxed grains. Fine and clustered SiC particles in the NZ are confirmed by scanning electron microscope (SEM). In addition, the microhardness values of nugget zones both in as-welded and PWHT condition exhibited a higher Vickers compared to that of AA6061-O. Furthermore, a mean tensile strength of 183.30 MPa that demonstrates a 52.22% increase in tensile strength is also observed in the transverse tensile tests subsequent to PWHT. Considering the three-point bending test results, it is explicit that an increase of 121.96% in the bending extension is obtained as there is no significant increase in maximum bending force after the PWHT.