Production method of alloy member, alloy member, and product using alloy member
A production method for an alloy member having mainly high hardness and high resistance to corrosion and produced by an additive manufacturing method, the alloy member, and a product using the alloy member are provided. The production method of an alloy member includes: 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 % to 35 atom % and containing Mo in a range exceeding 0 atom % and 8 atom % or less, the remainder being unavoidable impurities; and a heat treatment step of holding the shaped member in a temperature range higher than 500° C. and lower than 900° C. directly after the additive manufacturing step without undergoing a step of holding the shaped member in a temperature range of 1080° C. to 1180° C.
1 . 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.
2 . The production method of an alloy member according to claim 1 ,
wherein, in the additive manufacturing step, a heat source used in the additive manufacturing method is a laser beam or an electron beam.
3 . The method according to claim 1 ,
wherein a holding time of the aging heat treatment step is 0.5 hours or longer and 24 hours or shorter.