Method for preparing alloy pre-stretched plates

Abstract

The invention belongs to the field of alloy, and particularly relates to a method for preparing alloy pre-stretched plates. The method comprises the following steps: a) raw materials of alloy plates are pre-stretched after sequential quenching treatment and natural ageing treatment for 8h or more, and the alloy pre-stretched plates are obtained. By performing natural ageing treatment on the alloy plates by quenching treatment for 8h or more, the method has the advantages that the stain ageing effect of the alloy plates in subsequent quenching treatment is effectively mitigated; accordingly, slip lines on surfaces of the prepared alloy pre-stretched plates are eliminated. Experimental results show that when the method is used for preparing the alloy pre-stretched plates, a stretching displacement-strength curve in a pre-stretching process has no apparent serrated waveform, and no slip lines exist on the surfaces of the prepared pre-stretched alloy plates.

Description

technical field [0001] The invention belongs to the field of alloys, in particular to a method for preparing alloy pre-stretched plates. Background technique [0002] In order to improve the mechanical properties of the alloy plate, the alloy plate must be quenched after the ingot is formed. After the quenching treatment, the alloy plate will produce a large residual stress, which will lead to the uneven distribution of the mechanical properties of the alloy plate, which will cause a large size effect in the subsequent machining process of the alloy plate. Therefore, the quenching residual stress must be eliminated before the quenched alloy plate is used for subsequent machining. [0003] In the method of eliminating the residual stress of alloy quenching, pre-stretching is the simplest and most widely used method. The so-called pre-stretching is to perform a permanent plastic deformation after the alloy plate is quenched, so as to eliminate the quenching residue in the all...

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Problems solved by technology

[0004] The pre-stretched alloy sheet is also called alloy pre-stretched sheet. Due to the poor optimization of the conditions of the current alloy sheet pre-stretch process, the strain aging phenomenon will occur in the quenched alloy sheet during the pre-stretch process. That is, the strength of the tensile force applied to the alloy sheet during the pre-stretching process is difficult to keep stable, which is specifically manifested in the obvious jagged waveform of the tensile displacement-strength curve during the pre-stretching process of the alloy sheet

Due to the existence of the strain aging phenomenon, the surface of the alloy pre-stretched sheet produced by the existing process has obvious square linear defects, that is, "slip line"

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