In-situ induction heating device for neutron diffraction measurement

Abstract

The invention provides an in-situ induction heating device for neutron diffraction measurement. An induction heating technology is introduced into high-temperature loading of the device, and open type high-temperature loading and direct and accurate measurement of sample strain can be carried out on a sample in a neutron diffraction experiment; since an induction coil is of an open type heating structure, barrier-free penetration of measured neutrons in a full-angle range can be basically realized, a high-temperature extensometer for strain measurement can carry out contact type direct measurement on the sample, the reliability and effectiveness of loaded strain data in a neutron measurement process can be met, meanwhile, the loading and unloading simplicity and convenience of the device, the sample and the extensometer are ensured. The device is used in cooperation with a neutron diffraction stress spectrometer and a mechanical loading device, neutron stress distribution measurement of a metal material under the conditions of high temperature and force loading can be completed, and a testing means is provided for revealing research on mechanical properties and damage and fracture mechanisms of the material.

Description

technical field [0001] The invention relates to a neutron diffraction in-situ environment loading device in the application of neutron diffraction stress measurement, in particular to an in-situ induction heating device for neutron diffraction measurement. Background technique [0002] The stress distribution measurement of aviation wings, engines, high-speed rail tracks and other components can effectively evaluate the service life of materials, the pros and cons of processing technology and other information. The in-situ loading device can simulate the service conditions and processing environment, and when used with the neutron diffraction stress measurement spectrometer, it can complete the stress distribution measurement of materials or components under different environments. In order to obtain high-precision and high-quality measurement data, the in-situ loading device needs to accurately load the strain of the material under test, and an extensometer is required for ...

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Problems solved by technology

[0003] Since the in-situ heating device is limited by the sample stage and beam height, compared with the heating device on the conventional mechanical testing machine, the in-situ device requires small size and high operation convenience, and the introduction of the extensometer for strain measurement cannot be installed or the installation is complicated The problem is that the deformation measurement of the sample can only be obtained indirectly by driving the motor end

For example, the utility model patent (CN203132925U) discloses an in-situ stress-temperature loading device for neutron diffraction technology, and the utility model patent (CN207423647U) discloses an in-situ testing device for the mechanical properties of materials with variable temperature tension and torsion composite loads. , both of which have no direct strain measurement function. At the same time, this kind of closed furnace structure with a neutron window also has the problems of partial angle range beam blocking and complicated sample loading and unloading operations; the patent No. ZL201720225423.2 has disclosed An in-situ heating device for neutron diffraction, which proposes a structural design of an in-situ temperature loading device using an extensometer for strain measurement. The heating device of this invention belongs to an open heating structure, and the operation is relatively simple, but the upper and lower The structure of the heating plate makes the sample exposed to the atmosphere except the upper and lower sides, and the heat leakage is serious, which makes it difficult to meet the high temperature loading requirements above 800°C; the patent (CN108333201B) discloses an in-situ neutron diffraction stress and texture composite test The related defect of the method is to use the induction coil wound on the sample to heat the sample. Due to the coil structure, the conventional contact extensometer cannot be used, and the video extensometer is used, but the video extensometer has higher requirements for the light in the application, neutron diffraction The measurement site is not a conventional laboratory condition. Using a video extensometer to measure in a neutron diffraction measurement site with poor light conditions will cause problems such as strain tracking failure or large measurement errors. The measurement accuracy can only be guaranteed by using a contact extensometer

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