Device and method for quickly determining recrystallization temperature of metal material

Abstract

The invention belongs to the technical field of metal material processing and heat treatment, and relates to a rapid and accurate testing device and method for recrystallization temperature of a metalmaterial. The device consists of a loading mechanism, an atmosphere protection heating furnace, a sample table and a data acquisition computer. According to the testing method, the recrystallizationtemperature of the metal material is determined by collecting the load-temperature change of the three-point bending sample in the continuous heating process. According to the invention, only one sample is needed, so the research work of a large number of samples which takes as long as 1-2 days can be completed within 1-2 h, and the invention has the advantages that the sample preparation number is small, equipment operation is convenient, the recrystallization temperature is determined rapidly, and the operation cost is low; a load-temperature curve is automatically acquired in real time, sothat manual testing required by a hardness testing method, a metallographic testing method and the like is reduced, errors and manual interference are greatly reduced, and the accuracy is high.

Description

Technical field: [0001] The invention belongs to the technical field of metal material processing and heat treatment, and relates to a method and device for quickly determining the recrystallization temperature of metal materials. Background technique: [0002] After metal materials are plastically deformed by cold working and warm working, not only the internal structure and various properties have obvious changes, but also due to the increase of defects such as vacancies, distortions and dislocations, the metal materials are in a thermodynamically unstable high free energy state. . After the plastically deformed metal material is heated to a certain temperature, new grains without distortion are regenerated in the original deformed structure, and the properties have also undergone significant changes and returned to the state before deformation. This process is called recrystallization[ Hu Gengxiang, Cai Xun, Rong Yonghua. Fundamentals of Materials Science. 3rd Edition [M...

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Problems solved by technology

At present, the testing methods for the recrystallization temperature of metal materials mainly include metallographic microstructure analysis, hardness testing, electrical resistance testing, X-ray diffraction, thermal analysis, etc. Various methods have been applied in different fields, but there are the following problems : 1) Metallographic analysis and hardness testing methods are time-consuming, laborious, inefficient, and costly, and the initial recrystallization temperature is difficult to clearly define in the metallographic analysis method; Accurate testing; 3) X-ray diffraction analysis takes a long time and is inefficient, requires proprietary equipment, and the results are not intuitive; 4) The disadvantage of thermal analysis technology is that the equipment is expensive, the operation is inconvenient, and the required test sample size is small , it is difficult to reflect the overall characteristics of the material [Mao Pingli, Liu Zheng, Wang Zhi, et al. Detection method for single crystal superalloy recrystallization [P]. Chinese invention patent, application number: 201710027990.1, application time: 2017-06-20 ; Wang Chuan, Kang Yonglin, Zhu Shuai, et al. Research on recrystallization temperature and properties of ultra-low carbon aluminum killed steel cold-rolled sheet[J]. Thermal Processing Technology, 2011,40(6):36-39; Wang Minli, Zheng Zhiwang. Determination of annealing process for cold-rolled steel sheets for hot-dip galvanized steel sheets[J].Physical and Chemical Testing (Physical Volume), 2009,45(10):595-598.]

However, the hardness test method needs to test the hardness of samples at multiple temperature points, and there are still many shortcomings such as a large number of samples, long operation time, high operating costs, or expensive equipment such as variable temperature hardness testers.

[0006] Especially for age-strengthened metal materials, the alloy undergoes age precipitation hardening while recrystallization occurs, and the hardness of the alloy includes the effects of both recrystallization softening and precipitation hardening of the alloy, resulting in inaccurate recrystallization temperature of the tested alloy.

Therefore, for a long time, the recrystallization temperature test of aging precipitation-strengthened metal materials has been a difficult problem for scientific researchers, and no suitable solution has been found yet.

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