On the Rapid Solidification of Superalloys

Abstract

A method to produce bulk quantities of rapidly solidified powder has been developed and is being used for the study of superalloy compositions. The method involves rotary atomizing of a molten metal stream and subsequent quenching of the atomized particles in a high velocity, high mass flow helium environment. Results of study to d rates in excess of 10 9 te show that it is possible to attain cooling OC/sec for superalloys. The effect of this fast cooling has been one of significant phase suppression, wlhich can lead to the ability to alloy beyond presently defined limits.

Rapid Solidification and Dynamic Compaction of Ni-Base Superalloy Powders

“…the recent past, there has been considerable work involving the rapid solidification processing (RSP) of Ni-base superalloys (1). Two of the advantages of rapid solidification have been exploited in these studies, namely increased homogeneity and refinement of microstructure.…”

Template Assisted Fabrication of Tin Nanospheres by Thermal Expansion and Rapid Solidification Process

“…8) High-grade metal powders must meet specific quality criteria spherical shape, high cleanliness, and homogeneous microstructure. In general, powder can be fabricated by gas atomization (GA), water atomization (WA), 9) ultrasonic gas atomization (USGA), 10) centrifugal atomization (CA), 11) laser spin atomization (LSA), 12) the rotating electrode process (REP), 13) pulverization sous vide (PSV), 14) and the rapid spinning cup (RSC), 15) or rotating perforated cup (RPC) method. 16) In the above methods, micron-and submicron scale powder can be fabricated easily; however, it is difficult to control particle size at the nanoscale level, size uniformity, and size distribution in a narrow range.…”

Advanced Processing and Properties of High Performance Alloys

“…For the plastic flow and creep mechanisms, the densification rates should be sensitive to the state of stress between particles; this in turn should be a function of the particle-particle surface contact area or contiquity of the powder compact. * Thus the theoretical model i8 ' 1 stainless steel is shown in Fig. 3.…”