Characteristics of Heat-Affected Zone Cracking in Cast Alloy 718-A Study on Weldability of Cast Alloy 718 (Report 1).

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...

Effects 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...

Regenerative Heat Treatment of Low Alloy Cast Steel

Modeling and Simulation of Alloy 718 Microstructure and Mechanical Properties

Alloy 718 is a unique superalloy that has been in use for a number of years. It also has the distinction to be utilized throughout the aerospace and general industrial communities. The applications for this material are often very unique and require tailoring of the microstructure and subsequently the mechanical properties to meet these specific needs. To support optimization of Alloy 718 mecha...

a study on corrosion reasons of heat exchanger in ammonia unit

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