CN-121977896-A - Method for processing and recycling mechanical broken sample after irradiation

CN121977896ACN 121977896 ACN121977896 ACN 121977896ACN-121977896-A

Abstract

The application relates to the technical field of machining of mechanical samples after irradiation, and provides a method for machining and recycling a mechanical broken sample after irradiation, which comprises the steps of selecting a metal sample which is subjected to neutron irradiation and broken after a Charpy impact test or a fracture toughness test is finished; the method comprises the steps of adopting a linear cutting processing mode to remove a plastic deformation area at a broken part of a broken metal sample to obtain a processing unit body with a regular geometric shape, adopting a Vickers hardness detection method to detect the processing unit body, planning processing positions and processing directions of a plurality of small-size samples according to the actual size of the processing unit body, adopting a mechanical processing mode to process the processing unit body into the plurality of small-size samples, adopting an optical measuring device to carry out non-contact detection on the size of the small-size samples after processing is completed, and adopting load test equipment to carry out mechanical property test on the small-size samples. The method realizes that tens of small-size samples are processed from one standard broken sample, and improves the utilization rate of the samples.

Inventors

SUN KAI
WANG BIN
LIU SHASHA
CHEN XIN
ZHANG HAISHENG
WU YAZHEN
WANG ZIYI
LEI YANG
WANG HAIDONG
HE WEN
HUANG JUAN
Xue Keyuan

Assignees

中国核动力研究设计院

Dates

Publication Date: 20260505
Application Date: 20251218

Claims (10)

1. The method for processing and recycling the mechanical broken sample after irradiation is characterized by being used for reprocessing the metal sample broken by the mechanical test in the radioactive environment, and comprises the following steps: selecting a broken metal sample which is subjected to neutron irradiation and is subjected to a Charpy impact test or a fracture toughness test, wherein the broken metal sample is reserved in a region where plastic deformation does not occur; Removing a plastic deformation area at the broken metal sample fracture by adopting a linear cutting processing mode to obtain a processing unit body with a regular geometric shape; Detecting the processing unit body by using a Vickers hardness detection method to ensure that a plastic deformation area is completely removed and the material performance is not changed; measuring the actual size of the processing unit body, and planning the processing positions and the processing directions of a plurality of small-size samples by adopting a computer simulation arrangement algorithm according to the actual size of the processing unit body; According to the planned machining position and the machining direction, machining the machining unit body into a plurality of small-size samples in a machining mode in a hot chamber through a remote control machining system; After the machining is finished, performing non-contact detection on the size of the small-size sample by adopting an optical measuring device, so as to ensure that the machining precision meets the test requirement; and carrying out mechanical property test on the small-size sample by using load test equipment to obtain mechanical property data of the processed material.
2. The method for processing and recycling the mechanical breaking sample after irradiation according to claim 1, wherein the method for removing the plastic deformation area at the broken metal sample fracture by adopting a linear cutting processing mode to obtain the processing unit body with a regular geometric shape specifically comprises the following steps: the removal location of the wire cut is at least 5mm from the broken metal specimen fracture to ensure complete removal of the plastic deformation affected zone.
3. The method for processing and recycling the mechanical breaking specimens after irradiation according to claim 1, wherein the method for planning the processing positions and the processing directions of a plurality of small-size specimens by adopting a computer simulation arrangement algorithm comprises the following steps: And the computer simulation arrangement algorithm adopts a genetic algorithm or a simulated annealing algorithm to plan the processing path of the broken metal sample so as to optimize the utilization rate of the processing unit body.
4. The method for post-irradiation mechanical breaking specimen processing reuse according to claim 1, wherein said plurality of small-sized specimens specifically comprises a small-sized bent specimen, a small-sized sheet tensile specimen, or a small-sized compact tensile specimen.
5. The method for processing and recycling the mechanical breaking sample after irradiation according to claim 4, wherein the mechanical property test is performed on the small-size sample by using a load test device to obtain mechanical property data of the processed material, specifically comprising: And carrying out bending test or fracture toughness test detection on the small-size bending sample in a hot chamber, carrying out tensile test detection on the small-size sheet tensile sample, and carrying out fracture toughness test detection on the small-size compact tensile sample.
6. The method for processing and recycling the mechanical breaking sample after irradiation according to claim 5, wherein the load test equipment is a miniature mechanical tester and can be remotely operated in a hot chamber, and the maximum load is not more than 5kN.
7. The method for processing and recycling the mechanical breaking sample after irradiation according to claim 1, wherein the mechanical processing system comprises a multi-axis linkage numerical control machine tool, and the precise positioning and processing are performed in a hot chamber through a remote vision system.
8. The method for processing and recycling the mechanical breaking specimens after irradiation according to claim 7, wherein the precise positioning and processing are performed in a hot chamber through a remote vision system, and the method specifically comprises the following steps: And acquiring a real-time image of the processing unit body through an industrial camera, comparing the real-time image with a processing path generated by a preset computer simulation arrangement algorithm, and automatically correcting the coordinate zero point and the processing path of the mechanical processing system.
9. The method for processing and recycling the mechanical breaking sample after irradiation according to claim 7, wherein the processing unit body is processed into a plurality of small-size samples by a remote control mechanical processing system in a hot chamber in a mechanical processing mode, and the method specifically comprises the following steps: And processing the processing unit body into a plurality of small-size samples by adopting a combined processing technology of turning, milling, grinding and linear cutting through a remote control multi-axis linkage numerical control machine tool in a hot chamber.
10. The method for processing and recycling the mechanical breaking sample after irradiation according to claim 1, wherein the optical measuring device is a laser scanner or a structured light three-dimensional scanner, and the measuring precision is not lower than +/-0.01 mm.

Description

Method for processing and recycling mechanical broken sample after irradiation Technical Field The application relates to the technical field of machining of mechanical samples after irradiation, in particular to a method for machining and recycling mechanical broken samples after irradiation. Background Currently, conventional post-irradiation mechanical property testing typically employs standard-sized samples for destructive testing, such as the Charpy impact test or fracture toughness test. Neutron irradiation experiments are high in cost, long in period and limited by irradiation space, and the number of samples available for testing is extremely limited. Each sample can only acquire single test data, and the single-point data is difficult to accurately evaluate the mechanical properties of the material in an irradiation environment due to the dispersibility of the material property and the uncertainty of the test. The large amount of radioactive broken samples generated after the test are usually disposed as nuclear waste, which increases the radioactive waste management cost and causes the waste of precious irradiation materials. At present, the research on the recycling technology of the broken sample after irradiation at home and abroad is not mature, the mature mechanical processing recycling method is not found in the open literature, and the methods such as welding reconstruction and the like have the problems of heat affected zone, material property change, high technical requirements, inapplicability to strong radioactive environment and the like, and are difficult to safely and efficiently implement in a hot chamber. Disclosure of Invention The application aims to at least solve the problems that in the related art, a neutron irradiation sample has strong radioactivity, and after the test is finished, the neutron irradiation sample is usually treated as nuclear waste, so that the radioactive waste management cost is increased, and the irradiation material is wasted. In order to solve the technical problems, the application is realized as follows: The application provides a method for processing and recycling a mechanical broken sample after irradiation, which is used for reprocessing a metal sample broken by a mechanical test in a radioactive environment, and comprises the steps of selecting the metal sample broken after neutron irradiation and after the Charpy impact test or fracture toughness test is finished, wherein the broken metal sample is reserved with a region which is not subjected to plastic deformation; the method comprises the steps of adopting a linear cutting machining mode to remove a plastic deformation area at a broken metal sample fracture to obtain a machining unit body with a regular geometric shape, adopting a Vickers hardness detection method to detect the machining unit body to ensure that the plastic deformation area is completely removed and the material performance is not changed, measuring the actual size of the machining unit body, adopting a computer simulation arrangement algorithm to plan machining positions and machining directions of a plurality of small-size samples according to the actual size of the machining unit body, adopting a remote control machining system to machine the machining unit body into a plurality of small-size samples in a hot chamber according to the planned machining positions and the machining directions, adopting an optical measuring device to carry out non-contact detection on the sizes of the small-size samples after machining is completed to ensure that the machining precision meets the test requirement, and adopting load test equipment to carry out mechanical property test on the small-size samples to obtain mechanical property data of the machined materials. The application provides a method for processing and recycling mechanical breaking samples after irradiation, which comprises the steps of precisely removing plastic deformation areas of breaking samples by utilizing a linear cutting process through a technical route of 'remote machining in a hot chamber, precisely removing plastic deformation areas, optimizing layout by computer simulation and precisely processing by multiple processes', reserving elastic deformation areas with unchanged performances as processing unit bodies, performing three-dimensional simulation layout on the processing unit bodies through an optimization algorithm such as a genetic algorithm and the like to maximize the material utilization rate, then adopting a multi-axis linkage numerical control machine tool to remotely implement combined machining processes of turning, milling, grinding and linear cutting in the hot chamber, efficiently and precisely processing the processing unit bodies into a plurality of small-size samples meeting international standards, and finally finishing detection and mechanical performance test through a non-contact optical measurement and micro tester. The method realizes