Effect of Pre- and Post-weld Heat Treatment on Microstructure and Mechanical Properties of GTD-111 Superalloy Welds
作者： Morteza Taheri , Ayyub Halvaee , Seyed Farshid Kashani-Bozorg
DOI: 10.1007/S12540-019-00465-2
关键词: Metallurgy 、 Superalloy 、 Microstructure 、 Casting (metalworking) 、 Boride 、 Intermetallic 、 Materials science 、 Welding 、 Eutectic system 、 Liquation
摘要: In this paper, the liquation cracking and strain-age behavior of nickel-based GTD-111 superalloy which is welded by Nd:YAG pulse laser through several heat treatment cycles, has been studied. The effort was to develop most suitable microstructure concerning shape, morphology γʹ phase volume fraction different cycles in order obtain a weld without any defects. results revealed that γʹ, γ–γʹ eutectic, MC carbide, Boride enriched with Cr–Mo, Ni–Zr intermetallic are important parameters formation grain boundary melt cracks HAZ casting conditions. Before welding, full solution resulted omission cracking, attributed boride phases, high percentage eutectic γʹ. Investigations on hardness base metal showed there direct relationship between crack length. such case, as increases, it’s not only added absorption more welding stresses, but also stress release decreased, expansion HAZ. Added this, aging samples were undergone before due precipitation.
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