دانلود Microstructural Response of Directionally Solidified Rene´ 80 Superalloy to Gas-Tungsten Arc Welding

The microstructural response of directionally solidified René 80 (DS René 80) superalloy to gas-tungsten-arc (GTA) welding was investigated
قیمت : 330,000 ریال
شناسه محصول : 2009114
نویسنده/ناشر/نام مجله : Metallurgical and Materials Transactions A
سال انتشار: 2019
تعداد صفحات انگليسي : 13
نوع فایل های ضمیمه : Pdf+Word
حجم فایل : 1 Mb
کلمه عبور همه فایلها : www.daneshgahi.com
عنوان انگليسي : Microstructural Response of Directionally Solidified Rene´ 80 Superalloy to Gas-Tungsten Arc Welding

چکیده

Abstract

The microstructural response of directionally solidified René 80 (DS René 80) superalloy to gas-tungsten-arc (GTA) welding was investigated. Rapid heating during welding resulted in a significant grain-boundary liquation of solid-state reaction product γ′ precipitates, intergranular elemental segregation induced M5B3 borides, and secondary solidification constituents MC carbides and sulfocarbides, which were all present in the preweld heat-treated alloy. Liquation of these particles embrittled the grain boundaries in the heat-affected zone (HAZ) and caused microfissuring along the liquated grain boundaries. Nevertheless, contrary to the generally observed increase in HAZ cracking in superalloys with an increase in Ti and Al concentration, due to increase in the alloy’s hardness, significantly reduced cracking was observed in DS René 80 compared to the conventionally cast IN738 welded under the same conditions, despite its hardness being higher than that of IN738. This was related to the nature of base-metal grain- boundary intersections at the fusion-zone boundary in these materials.

Keywords: Gas-Tungsten Arc Welding
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