A heat treatment method that can improve the performance stability of medium and high tonnage smelted cunisicr alloys

Abstract

The invention discloses a heat treatment method capable of improving the performance stability of a medium / high-tonnage smelted CuNiSiCr alloy. Due to the sufficient utilization of the reasonable coordination between solution temperature and time as well as appropriate cold deformation and recrystallization temperature in the method, on one hand, the component uniformity of large parts can be promoted as much as possible, and on the other hand, the amplitude of material performance lowering caused by crystal grain and precipitated phase coarsening is also reduced; and the process is beneficial to the guarantee that a large CuNiSiCr alloy structural member has relatively good production repeatability and performance stability, and the alloy performance can be still kept at a relatively high level. By using the heat treatment method, the relatively high solution temperature and relatively long solution time can be guaranteed, the uniformity of components and structures in large structural members can be sufficiently promoted, and the influence proportion and degree of weak areas caused by nonuniformity problems in the large structural members are reduced; and the technical method designed by the invention is simple, feasible and high in operability.

Description

【Technical field】 [0001] The invention belongs to the field of heat treatment technology and relates to a heat treatment method capable of improving the performance stability of CuNiSiCr alloy smelted with medium and high tonnage. 【Background technique】 [0002] In the preparation of medium and high tonnage CuNiSiCr alloys, especially when the monomer mass exceeds 1t, traditional melting and casting has become a more feasible method, but it faces serious problems of composition and structure uniformity. The common problem exists. This inhomogeneity makes the local area of ​​the large part a weak point. Under the action of external conditions, it is easier to fail first and then expand to the whole, causing huge losses. [0003] Generally speaking, homogenizing annealing at high temperature for a long time on castings is beneficial to alleviate and solve the inhomogeneity in the composition and structure of castings, but it often causes the structure to be too coarse, which w...

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Problems solved by technology

[0002] In the preparation of medium and high tonnage CuNiSiCr alloys, especially when the monomer mass exceeds 1t, traditional melting and casting has become a more feasible method, but it faces serious problems of composition and structure uniformity. Existing common problems, this inhomogeneity makes the local area of ​​large parts become a weak point, and it is easier to fail first and then expand to the whole under the action of external conditions, causing huge losses

[0003] Generally speaking, homogenizing annealing at high temperature for a long time on castings is beneficial to alleviate and solve the inhomogeneity in the composition and structure of castings, but it often causes the structure to be too coarse, which will also lead to the deterioration of mechanical properties such as strength, while After homogenizing annealing at high temperature for a long time, forging and other treatments are carried out to break the coarse grain structure. From the perspective of operational feasibility, on the one hand, the forging of large-scale copper alloy components has high requirements on the output capacity of the forging equipment itself, which is not easy to meet. On the other hand, On the one hand, the forging temperature of large parts is high, and when the residence time exceeds a certain limit, it is easy to cause the precipitation and coarsening of CuNiSiCr alloy precipitates, which makes it difficult for the alloy to return to a higher performance level after forging, and the post-processing space is small

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