Homogenization treatment process for high-temperature alloyed steel ingot

Abstract

A homogenizing treatment method for high-temperature alloy ingots is annealing treatment in an annealing furnace. The method is characterized in that the temperature of the annealing treatment is between the temperature of 1180 to 1230 DEG C and the annealing lasts for twenty hours. The method of the invention adopts the technical proposal, so the method can effectively solve the problem of segregation between the phase Laves and the phase delta and improves the alloy segregation degree to the utmost extent.

Description

technical field The invention relates to a high-temperature alloy processing technology, in particular to a method for homogenizing high-temperature alloy steel ingots. Background technique GH169 superalloy is an iron-nickel-based alloy containing up to 5% niobium. Due to its composition characteristics, it determines the serious segregation of the alloy elements, especially the segregation of Nb, and the limitation of cooling speed, resulting in the ingot after cooling. Laves phase and δ phase must be formed in the as-cast structure, and the existence of Laves phase in the alloy leads to the low plasticity of the ingot. Domestic research on this has achieved certain results. For example, for the Φ360 ingot type, the Laves phase can be basically eliminated by uniform treatment at 1120°C for 24 hours or 1150°C for 15 hours. Although the Laves phase is eliminated, there are quite serious grain bands between coarse and fine grains, and the δ phase is densely distributed in the...

AI Technical Summary

Problems solved by technology

Although the Laves phase is eliminated, there are quite serious grain bands between coarse and fine grains, and the δ phase is densely distributed in the fine grain bands

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