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Method for evaluating corrosion fatigue damage

An evaluation method and technology for corrosion fatigue, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problem of inability to reproduce the correct state, and achieve the effect of improving reproducibility

Active Publication Date: 2014-11-05
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the damage form evaluated in the present invention cannot reproduce the correct state by using the test method of the above-mentioned non-patent literature in terms of "fatigue" in which repeated stress is severely applied.

Method used

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  • Method for evaluating corrosion fatigue damage
  • Method for evaluating corrosion fatigue damage
  • Method for evaluating corrosion fatigue damage

Examples

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Embodiment

[0039] figure 1 It is a schematic diagram showing an example of a test piece used in the evaluation method of the present invention. It is used to reproduce and evaluate the corrosion fatigue damage that can occur in the internal cooling hole of the actual die casting metal mold. The test piece 1 is formed by sealing the following corrosive medium 5 inside the space 3 of the raw material piece 2 by means of the plugs 4 at both ends. The size of the raw material sheet 2 is 15 mm square x 60 mmL, and a through hole with a diameter of about 10 mm is formed at the center of the 15 mm square in the L direction. In addition, the material of the raw material sheet 2 is the same as that of the actual die-casting mold assumed in this embodiment, and SKD61 is quenched at 1030°C and tempered to 45HRC. The space 3 of the raw material sheet 2 is equivalent to the internal cooling hole of the actual die-casting metal mold, and the corrosion medium 5 as a simulated cooling medium is sealed...

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Abstract

Provided is a method for evaluating a corrosion fatigue damage wherein a corrosion fatigue damage occurring in various members such as the internal cooling hole of a die is reproduced easily by using a test piece. The method for evaluating a corrosion fatigue damage is carried out in such a manner that a load is applied repeatedly to the surface of a test piece having an internal space into which a corrosive medium is introduced, and the surface and / or the cross-section of the internal space in the load-applied test piece is observed. The method for evaluating a corrosion damage is carried out preferably in such a manner that a test piece, where a space simulating the internal cooling hole of a die is formed in a material piece consisting of the material of the die, and a corrosive medium simulating the cooling medium of the die is introduced into the space, is provided, a load is then applied repeatedly to the surface of the test piece, and the surface and / or the cross-section of the space in the load-applied test piece is observed.

Description

technical field [0001] The present invention relates to a method for evaluating corrosion fatigue damage that occurs on components subjected to repeated loads in a corrosive environment by simply reproducing them using test pieces. In particular, it also relates to the most suitable evaluation method for evaluating corrosion fatigue damage occurring in internal cooling holes of metal molds. Background technique [0002] Conventionally, the following method has been used in the evaluation of the stress corrosion cracking resistance of ordinary steel materials: a test piece is immersed in a corrosion tank, a certain tensile load is applied, and the characteristics are compared in the time until fracture The constant load stress corrosion cracking test method for evaluation (Non-Patent Document 1); on the test piece introduced in advance with cracks, apply a load (Wedge Opening Loading; WOL) to open the cracked surface by bolts or wedges, etc., and obtain the The stress corros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
CPCG01N2203/0641G01N2203/0073G01N17/04G01N2203/0635G01N3/32G01N17/00
Inventor 片冈公太
Owner HITACHI METALS LTD
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