HIGH MELTING POINT METAL BASED ALLOY MATERIAL EXHIBITING HIGH STRENGTH AND HIGH RECRYSTALLIZATION TEMPERATURE AND METHOD FOR PRODUCTION THEREOF

摘要

A high melting point metal based alloy material exhibiting high strength and a high recrystallization temperature, characterized in that it is a worked material which is produced by a method comprising providing an alloy worked material having one metal of Mo, W and Cr as a base phase and at least one of Ti,Zr, Hf, V, Nb and Ta as a metal forming a solid solution with the base phase, subjecting the alloy worked material to a multi-step nitriding treatment, to thereby form a worked material containing particles of a nitride of the above metal forming a solid solution with the base phase, being precipitated and dispersed in the base phase, and then subjecting the above worked material containing particles of a nitride to a carbonizing treatment by the use of a carbon source co-existing with oxygen, and in that it contains the carbon segregated at a grain boundary due to the carbonizing treatment and oxide particles converted from the above nitride particles.