Production method of alloy member, alloy member, and product using alloy member

A production method of an alloy member comprising:

• an additive manufacturing step of forming a shaped member through an additive manufacturing method using an alloy powder containing elements Co, Cr, Fe, Ni, and Ti each in a range of 5 atom % or more to 35 atom % or less and containing Mo in a range exceeding 0 atom % and 8 atom % or less, the remainder being unavoidable impurities;
• and
• an aging heat treatment step of holding the shaped member obtained through the additive manufacturing step in a temperature range higher than 500° C. and lower than 900° C. in a state where a melt solidification structure comprises microcell structure, which are cell-shaped regions finely separated by a network of dislocations, and each cell-shaped region has an average diameter of 10 μm or less and is provided at least in crystal grains of a surface layer part of the shaped member,
• the shaped member which has been additively manufactured is directly subjected to the aging heat treatment without undergoing a solution heat treatment step.