Welcome to the official page on Laser Ultrasonics for Metallurgy. You can find information, documentation and access to the reference analysis software for the processing of ultrasonics data. The page is provided by the company CTOME Inc. (Computational Tools for Metallurgy) developer of the LUMFILE Software.
The LUMFILE software is dedicated to the analysis of ultrasonic wave properties in metals at high temperature
(Current Version of CTOME is 2.1beta)
Applications : Evaluation of austenite grain size in metal, phase transformation in steel, ferrite recrystallization in steel, austenite recrystallization in steel, recovery process in steel, grain size in other metals, recrystallization in Aluminum alloys, residual stresses in Aluminum alloys, phase transformation in Titanium, ageing study in beta stabilized Titanium alloys, texture in hexagonal material, sintering process, plastic strain ratio in metals, elastic Moduli measurements in other compounds
What is Laser Ultrasonics?
Laser ultrasonics for metallurgy (LUMet) is an emerging technology dedicated to in-situ monitoring of microstructure evolution during thermo-mechanical processing. In this non-destructive and non-contact technique, lasers are used for the generation and detection of ultrasound pulse in the material. Ultrasonic velocity and attenuation are measured and related to microstructure parameters. The LUMet system is designed as an attachment to a Gleeble thermo-mechanical simulator to routinely monitor microstructure evolution during laboratory simulated industrial processing cycle.
A broadband ultrasonic pressure pulse is generated with a Nd:YAG laser (wavelength of 532 nm) by ablating a thin layer at the sample surface (~10nm). The ultrasonic pulse propagates back and forth through the thickness of the sample and is detected with a second Nd:YAG laser which illumi-nates the surface with an infrared radiation. The ultrasound properties measured in this technique are representative of the volumetric properties of the material. Ultrasonic velocity depends on the elastic constants and density, i.e. crystal structure and texture, whereas ultrasonic attenuation is primarily related to the average grain size. In steels, methods were previously developed to correlate laser ultrasonic measurements with the austenite grain size, the recrystallization of ferrite and austenite, as well as the austenite decomposition. These studies provide proof of concept but further exploration of the LUMet technique is critical to develop it into a reliable tool for process design and control in industry.
Lasers are used for the generation and detection of a broadband laser ultrasonic pulse in the sample.
The pulse propagates back and forth in the sample and interacts with the microstructure
CTOME decode the ultrasonic signal to revel the state of the material in real time.
CTOME also provide the software Profile. It is a program like Excel, Origin or Qtiplot for the data analysis in Engineering. It is especially adapted to the fast process of large dataset. This is especially useful for the user of Gleeble thermomechanical simulator, tensile machine and other equipment in metallurgy.
Data analysis tools including smoothing, interpolation, non-linear fitting, derivative, batch processing, output graphics, navigation, multiple operations, statistics