Determination of hydrogen-induced damage by an acoustic method

The 13HFA corrosion- and cold-resistant steel is studied by an ultrasonic method after hydrogen absorption for 96, 192, and 288 hours. Within the framework of classical flaw detection, it was found that the formation of macrodefects occurs only at 288 hours of hydrogen absorption. In the study of the material by the spectral-acoustic method, it was found that, during hydrogen absorption for 96 and 192 hours, the signal spectrum changes. This indicates the formation of microdefects. It is shown that the determination of the damage by the conventional ultrasonic flaw detection method and the use of the spectral-acoustic method for the evaluation of fracture at the microlevel give more complete information on the state of the investigated alloys.

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A New Ultrasonic Flaw Detection Method on Smooth Surfaces and its Applications

Japanese Journal of Applied Physics ◽

10.7567/jjaps.20s3.185 ◽

1981 ◽

Vol 20 (S3) ◽

pp. 185

Author(s):

Takahiko Otani ◽

Yasumasa Urabe

Keyword(s):

Detection Method ◽

Flaw Detection ◽

Smooth Surfaces ◽

Ultrasonic Flaw Detection ◽

Ultrasonic Flaw

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Experience in the application of the non-destructive method of acoustic emission in the production of titanium billets and products of transport engineering

Journal of Physics Conference Series ◽

10.1088/1742-6596/2094/4/042018 ◽

2021 ◽

Vol 2094 (4) ◽

pp. 042018

Author(s):

E Yu Remshev ◽

A I Olehver ◽

S A Voinash ◽

V A Sokolova ◽

A A Ivanov ◽

...

Keyword(s):

Acoustic Emission ◽

Mechanical Treatment ◽

Flaw Detection ◽

Vt22 Titanium Alloy ◽

Ultrasonic Flaw Detection ◽

Ultrasonic Flaw ◽

Titanium Surfaces ◽

And Control ◽

Non Destructive

Abstract The article discusses the issue of using the non-destructive method of acoustic emission at the stage of blank production. So, due to the violation of the heat treatment modes, various defects are formed in the starting material, which affects the operational properties of the finished products. To eliminate this problem, the stages of production of titanium blanks and products of transport engineering were studied, such as: heat and mechanical treatment, ultrasonic quality control, determination of the level of mechanical properties and control of the structure. In the course of the research, a method of acoustic emission control was developed and tested. The experiment on setting the locations of defects was carried out on ingots of VT22 titanium alloy during cooling. The reliability of the developed method is confirmed by the existing method of ultrasonic flaw detection. It has been established that this method can be effectively used to control workpieces and machined workpieces for the manufacture of particularly critical mirrors for searching for inhomogeneous inclusions and increasing the efficiency of the technological process by eliminating machining of VT1-0 titanium surfaces with inhomogeneous inclusions. In addition, this method can be used to search for defects commensurate with the grain size of the ingot, as well as significantly smaller sizes.

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