Method for improving yield of TC17 titanium alloy rods

Abstract

The invention discloses a method for improving the yield of TC17 titanium alloy rods. The method includes the following steps that (1), preparation is carried out before forging, oxidized scale in a heating furnace is cleaned up before the furnace is charged with steel ingots, the purpose of the process is to enable billet heating temperature to be uniform, and heat insulation wool and glue are prepared; (2) heating is carried out, after the heating furnace is heated to 100 DEG C+ / -10 DEG C, the steel ingots are fed into the furnace, after heat preservation is carried out for 0.5-1 hour, an anti-oxidation coating is applied, after applying is completed, air-cooling is carried out for 0.5-1 hour, then the material is fed into the heating furnace to be heated, at the time, one heating process before forging is started, the steel ingots with the temperature less than or equal to 200 DEG C are fed into the heating furnace, the temperature is raised uniformly for 6-7 hours, after heat preservation is carried out for 2-3 hours and the temperature reaches 850 DEG C+ / -10 DEG C, discharging is carried out, the middles of the steel ingots are wrapped with the heat insulation wool, after wrapping is completed, the steel ingots are returned to the furnace for heat preservation for 1-1.5 hours, and then discharging for forging is carried out; and (3) forging is carried out, 7 heating numbers are adopted for forging with each heating number less than or equal to 40% upsetting reduction.

Description

technical field [0001] The invention relates to a forging process, in particular to a method for improving the yield of TC17 titanium alloy rods. Background technique [0002] Titanium alloy has the characteristics of high strength, toughness, hardenability, good thermal stability, and high fatigue strength. It is used in the manufacture of aircraft engines, compressor disks and engine blades, and has been widely used in military and civil aviation engines. However, due to surface cracks, end cracks and other defects that often occur during the forging process, as well as defects such as internal quality not up to standard after forging, the process yield of TC17 products is only about 60%. [0003] The original forging process of the bar includes: the first fire to the seventh fire are longitudinally elongated after upsetting, see figure 1 ; The eighth fire: use the flat pliers to carry out the elongation operation; the ninth fire: carry out the operation of forming a mate...

AI Technical Summary

Problems solved by technology

[0006] 1) Titanium alloy products are very sensitive to forging temperature. Once the temperature does not meet the requirements, there will be cracks on the yin and yang surfaces and the surface

[0007] 2) Due to the high internal requirements of titanium alloys, the structure is improved by repeated upsetting and drawing, and the number of production fires is more, which leads to the increase of surface cracks

[0008] 3) If there is a crack during the production process, pull it down and grind it, which will also affect the yield

[0009] 4) Some titanium alloys can only enlarge the size due to deep cracks, which can be saved by increasing turning, so the surface quality and yield are seriously affected

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