Novel stress corrosion test specimen and experiment method

Abstract

The invention discloses a novel stress corrosion test specimen and an experiment method thereof. The test specimen is in a rectangular flat plate shape, and the plate-shaped test specimen is cut and formed in one step by a line cutting method. The method comprises the following steps: step 1. preparing the test specimen for getting ready to do the displacement deformation stretching stress corrosion experiment of the stress corrosion crack test; step 2. preparing 42 percent of MgCl2 solution and NaCl / NaOH mixed solution; step 3. building an experiment device, and placing the prepared test specimen into the experiment environment for carrying out stress corrosion experiment until the test specimen has corrosion cracks; and step 4. taking the test specimen for carrying out gold phase observation, finding the crack initialization position, and carrying out statistical analysis on the two-phase stainless steel stress corrosion mechanism. The processing of the test specimen of the invention is very convenient, and can be completed through one-step processing by line cutting in existence of plate-shaped test blocks.

Description

technical field [0001] The invention relates to a stress corrosion test technique, in particular to a test method and a sample for a stress corrosion cracking test. Background technique [0002] The existing test methods for stress corrosion cracking generally fall into the following categories: [0003] (1) Stress corrosion cracking test under constant load The tensile sample 2 is suspended on a tensile testing machine loaded with a weight 3 , and the tensile sample must be immersed in a sealed corrosive medium environment chamber 1 . Alternatively, a cantilever beam sample 6 is used, one end of which is horizontally clamped on the chuck of a fixed frame, the tested part of the sample is immersed in a sealed corrosive medium environment chamber 4, and a weight is hung on the other end of the cantilever 5 loading. Generally, there is a notch 7 in the center of the cantilever sample. The general method of the two sample machine tests is shown in Figure 1. [0004] Among t...

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Problems solved by technology

Some samples are simple but require expensive and complicated sample machines (such as slow tensile tests), and the final results are also qualitative

However, WOL samples that can be used for KISCC and da / dt quantitative tests are complicated to process and consume a lot of materials. Due to the structural characteristics of the samples themselves, they are not suitable for stress corrosion tests under large strain conditions or full yield conditions. The biggest disadvantage of this test method

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