Method of brazing and article made therefrom

An impeller assembly made by a method of joining stainless steel components by brazing, comprising the steps of:

• (a) providing at least two stainless steel components of a selected configuration and of a selected composition, selected from one of a 17Cr-4Ni PH alloy or a 13Cr-4Ni martensitic alloy;
• (b) providing a brazing filler metal alloy comprising 80%-85% by weight Au and 15%-20% by weight Ni;
• (c) placing the brazing filler metal alloy in or adjacent to a gap formed between the at least two stainless steel components to be joined;
• (d) heating said stainless steel components and said brazing alloy over a period of time from 5 to 8 hours from an ambient temperature to a liquidus temperature of between 1740° F. to 2100° F.;
• (e) cooling said brazed assembly over a period of time of from ½ to 5 hours from said liquidus temperature to a temperature of between 1200° F.-1400° F.;
• and
• (f) quenching said cooled, brazed assembly of step (e) from the temperature of between 1200° F.-1400° F. to a temperature of less than 400° F. in a time of less than 2 hours.