Method for non-destructive testing of a turbomachine part

Patent metadata

Field	Value
Publication number	US-10996180-B2
Application number	US-201716463988-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	Nov 28, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A method for controlling the crystallographic orientation of at least one grain of a turbo engine part. The method includes emitting a beam of electromagnetic radiation through an elementary volume of the part and record diffraction information on the electromagnetic radiation passing through the part. This step is repeated on a given area of the part. The method further includes determining the crystal spatial orientation of each of said elementary volumes and deducing the presence of at least one first crystallographic grain for which the elementary volumes are oriented according to the same crystallographic orientation. The method further includes calculating the angular difference between the crystal spatial orientation of said first grain and a predetermined direction taken from the part and comparing it to a first predetermined threshold value and determining a state of use of the part.

First claim

The invention claimed is:

1. A method for controlling the crystal orientation of at least one crystallographic grain of a turbo engine part, the method comprising the steps of:
a) emitting a beam of electromagnetic radiation through a volume of a plurality of elementary volumes of the part and record diffraction information on the electromagnetic radiation passing through the part;
b) repeating step a) on other volumes of the plurality of elementary volumes of the part;
c) determining the crystal spatial orientation of each of said plurality of elementary volumes and deducing the presence of at least one first crystallographic grain for which the plurality of elementary volumes are oriented according to the same crystallographic orientation;
d) calculating the angular difference between the crystal spatial orientation of said first grain and a predetermined direction taken from the part and comparing it to a first predetermined threshold value; and
e) determining a state of use of the part.

2. The method according to claim 1 , which further comprises the following steps:
i) identifying in the volume of the plurality of volumes the presence of at least a first and second distinct crystallographic grain from the diffraction information;
ii) determining a spatial orientation of said second grain of the part from the diffraction information;
iii) calculating the angular deviation between the spatial orientation of said second grain and said predetermined direction of the part and comparing it to the first predetermined threshold value;
iv) calculating the angular difference between the spatial orientation of said first grain and the spatial orientation of said second grain and comparing it to a second predetermined threshold value;
v) determining a state of use of the part in steps d), iii) and iv).

3. The process according to claim 1 , wherein the first predetermined threshold value is between about −15° and about 15°.

4. The method according to claim 1 , wherein the second predetermined threshold value is between about −12° and about 12°.

5. The method according to claim 1 , wherein the determination of the state of use results in scrapping the part if one of the deviations is greater than a predetermined threshold to which it is compared.

6. The method according to claim 1 , wherein the identification of the presence of a grain is carried out by comparing a diffraction image of the radiation that has passed through the part with a database comprising reference diffraction images corresponding to known orientations of grains in a known part, or by comparing the position of the peaks on the diffraction image with known peak reference positions contained in a database.

7. The method according to claim 6 , wherein the reference diffraction images are diffraction images obtained by experimentation on real parts or on parts digitally simulated from a crystallographic point of view.

8. The method according to claim 6 , wherein the known part is and the part analysed are of a same type.

9. The method according to claim 1 , wherein the diffraction information consists of a diffraction image obtained from the beam diffracted through the part.

10. The method according to claim 1 , wherein the part is a blade of a turbo engine turbine, the predetermined direction taken on the part being the longitudinal direction extending between the foot and the top of the blade.

11. The method according to claim 1 , wherein the beam of electromagnetic radiation is an X-ray beam.

12. The method according to claim 1 , wherein an identification of all crystallographic grains of the given area of the part is carried out, the given area of the part possibly corresponding to the entire part.

Assignees

• Safran
• Safran Aircraft Engines
• Centre Nat Rech Scient
• Association Pour La Rech Et Le Developpement Des Methodes Et Processus Industriels Armines

Inventors

• Remacha Clément
• Romero Edward
• Arnaud Alexiane
• Proudhon Henry
• Herbland Thibault

Classifications

• G01N2223/604

  monocrystal · CPC title

• G01N2291/0289

  Internal structure, e.g. defects, grain size, texture · CPC title

• G01N23/20 Primary

  by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials · CPC title

• G01N2223/0566

  analysing diffraction pattern · CPC title

• G01N2203/0062

  Crack or flaws · CPC title