Process for preparing high niobium Ti Al alloy large size cake material

Abstract

The preparation of large high-Nb TiAl alloy cake includes the technological process of smelting, soakage treatment, turning, canning, forging and slow cooling. The preparation process features the smelitng including the first self-consuming, the self-consuming kish and the second self0consuming steps; the soakage treatment at 1100-1300 deg.c for 24-48 hr; turning to eliminate surface scale; canning with stainless steel pipe, titanium pipe and stainless steel plate; forging in a 3000-5000 oil press at deformation temperature of 1200-1350 deg.c after heating at 1250-1300 deg.c for 40-60 min in the furnace and preheating for 6-10 hr to produce deformatino amount of 60-80 % at the rate of 0.001-0.1/s; and tempering at low temperature. The present ivnention has the advantages of fine crystal grains and excellent comprehensive mechanical performance.

Description

Technical field: [0001] The invention provides a method for preparing a high-niobium TiAl alloy large-size cake material. Background technique: [0002] After recent years of research on high-niobium TiAl intermetallic compounds, a series of important progress has been made in the phase diagram, oxidation resistance, structure and performance. Its excellent high temperature performance, oxidation resistance and creep resistance are outstanding. It has received widespread attention. The addition of high-content refractory metal niobium increases the melting point of the alloy by about 90--100°C compared with ordinary titanium-aluminum alloys. The solid solution strengthening of niobium elements makes its 900°C yield strength higher than ordinary titanium-aluminum alloys. High 150---200MPa, the addition of niobium with high melting point reduces the diffusion coefficient and improves the oxidation resistance. It is a new generation of high-temperature structural materials with...

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However, there is no research report on the preparation of large-sized high-niobium TiAl alloy cakes

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