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- 저자 : Ayyub Halvaee (검색결과 1 건)
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Morteza Taheri,Ayyub Halvaee,Seyed Farshid Kashani‑Bozorg 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
In this paper, the liquation cracking and strain-age cracking behavior of nickel-based GTD-111 superalloy which is weldedby Nd:YAG pulse laser through several heat treatment cycles, has been studied. The effort was to develop the most suitablemicrostructure concerning shape, morphology and γʹ phase volume fraction by several different heat treatment cycles inorder to obtain a weld without any defects. The results revealed that γʹ, γ–γʹ eutectic, MC carbide, Boride enriched withCr–Mo, and Ni–Zr intermetallic phase are the most important parameters in the formation of grain boundary melt and cracksin HAZ in casting conditions. Before welding, a full solution heat treatment resulted in the omission of liquation cracking,which attributed to full solution of boride and Ni–Zr intermetallic phases, and the solution treatment of a high percentageeutectic phases, and γʹ. Investigations on the hardness of the base metal showed that there was a direct relationship betweenhardness of the base metal and crack length. In such case, as the hardness of the base metal increases, it’s not only added toabsorption of more welding stresses, but also stress release decreased, which resulted in the expansion of cracking in HAZ.Added to this, aging treatment of samples which were undergone aging treatment before welding, resulted in the formationof strain-age cracking due to γʹ phase precipitation.
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