منابع مشابه
Characterization of the Dendritic Microstructure of Investment Cast Alloy 718
The as-cast alloy 718 shows a multiphasic structure which consists of dendrites, carbides and Laves phases. The amount, size, shape, and dispersion of these phases affect the properties and the processing which follows, This structure was characterized by measurements of volume fraction, size, dispersion, and shape factor of carbide and Laves phases. Secondary arm spacing and Vickers hardness w...
متن کاملEffects of Magnesium on Niobium Segregation and Impact Toughness in Cast Alloy 718
A program has been conducted on the effects of Mg in cast alloy 718. The results show that small amounts of Mg improves impact toughness and decreases Nb segregation by decreasing secondary dendrite arm spacing which results in less and smaller interdendritic Laves and MC eutectics. Small amounts of Mg produce a more spheroidal as well as a more dispersive MC phase. Impact toughness was found t...
متن کاملEFFECTS OF HOT ISOSTATIC PRESSING ON THE TENSILE PROPERTIES OF A356 CAST ALLOY
The influences of age hardening and HIP (Hot Isostatic Pressing) on the mechanical properties of A356 (Al 7Si 0.6 Mg) casting alloys were studied. Cast bars were homogenized, heated and maintained at a temperature of 540°C for a duration of 2 hours, followed by rapid cooling in a polymeric solution. The castings were age hardened at 180°C for a duration of 4 hours before being subjected to HIP ...
متن کاملHot cracking in tungsten inert gas welding of magnesium alloy AZ91D
Plates of 3–5 mm in thickness were extracted from an AZ91D ingot and then butt joints of the plates were produced using tungsten inert gas (TIG) welding method. The TIG arc was also used to deposit welding beads on some of the thin plates. No cracking was found in the butt joints. However, hot cracking was always observed to propagate from the heat affected zone (HAZ) under the welding bead int...
متن کاملComparison of Mechanical Behavior and Microstructure of Continuous Cast and Hot Worked CuZn40Al1 Alloy (TECHNICAL NOTE)
The performance of components produced by conventional route of a thermo mechanical process and those produced by continuous casting is interesting from different aspects of economy and technology. The performance of products in their service depends on their properties which are strongly influenced by production routes. In the present work the hardness, tensile and tensile-impact behaviors of ...
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ژورنال
عنوان ژورنال: Science and Technology of Welding and Joining
سال: 2018
ISSN: 1362-1718,1743-2936
DOI: 10.1080/13621718.2018.1429238