Niobium-containing nickel-chromium alloy diffusing heat treatment process analysis method based on in-situ statistics
A diffusion heat treatment and process analysis technology, applied in the field of material analysis, can solve the problems of energy spectrum analysis, poor reliability, and inability to objectively reflect segregation characteristics and segregation degree, etc.
Inactive Publication Date: 2019-12-20
HEBEI IRON AND STEEL
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Problems solved by technology
The energy spectrum analysis based on the rough positioning of the dendrite morphology often cannot objectively reflect the segregation characteristics and segregation degree of the main segregation elements Nb and Cr
With the increase of diffusion heat treatment temperature and the extension of time, the composition segregation of the ingot will be improved, but the degree of improvement of the composition segregation has been difficult to use the characteristics of the dendrite morphology to analyze the energy spectrum.
Therefore, the traditional temperature and time combination test method often needs to combine the advantages and disadvantages of compression deformation to investigate the advantages and disadvantages of the diffusion heat treatment process, and this method requires many repeated tests, the test volume is huge, and the measured residual segregation The index results have great subjectivity, chance, and poor reliability
[0004] The simulation calculation method is to calculate the residual segregation index under different heat treatment time and temperature according to the segregation characteristics and diffusion capacity of different elements, but due to the different conditions of the heat treatment furnace, the actual diffusion thermodynamic force is often quite different from the calculated value. It can only be used as a reference for formulating the diffusion heat treatment process system
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[0025] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.
[0026] In an embodiment, the concrete steps of the present invention are as follows:
[0027] ① Take multiple block metallographic samples from the original ingot;
[0028] The sampling position is the same position relative to the core of the ingot, and the number of samples is determined according to the number of heat treatment processes; after sampling, grinding and polishing, the metallographic photo is corroded with the metallographic etchant corresponding to the niobium-nickel-chromium alloy, and the size of the block metallographic The principle is that more than 5 dendrite trunk regions can be observed in the 50× field of view of the phase microscope;
[0029] ② Place the prepared metallographic sample on a microhardness tester for observation and marking;
[0030] The position of the in-situ marking point should fall on the primary d...
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The invention relates to a niobium-containing nickel-chromium alloy diffusing heat treatment process analysis method based on in-situ statistics, and belongs to the technical field of material analysis. The technical scheme comprises the following steps of observing each sample by using a microhardness instrument, and performing multi-point in-situ marking on multiple dendritic crystal trunk regions and inter-dendritic regions according to a dendritic crystal morphology of an original casting blank, thereby enclosing an in-situ marking region; statistically calculating the change of credible average residual segregation index according to energy spectrum analysis results of the corresponding in-situ marking positionings under different diffusing heat treatment process conditions, thereby determining whether the in-situ marking region is a credible marking region or not; and combining the growth tendency of crystal grains under the corresponding heat treatment process conditions. Compared with the traditional combined test method and a simulation calculation method, the optimal diffusing heat treatment process of the niobium-containing nickel-chromium alloy can be selected more reasonably and accurately.
Description
technical field [0001] The invention relates to a process analysis method for diffusion heat treatment of niobium-containing nickel-chromium alloy based on in-situ statistics, and belongs to the technical field of material analysis. Background technique [0002] During the solidification process of niobium-containing nickel-chromium alloy ingot, solute redistribution will inevitably occur, resulting in compositional differences in different solidification zones, which is the so-called micro-segregation. Microsegregation must be reduced or eliminated by homogenizing diffusion heat treatment annealing. There are two methods for determining the homogenization diffusion process of ingots; one is the traditional temperature and time combination test method; the other is the simulation calculation method. [0003] For niobium-containing nickel-chromium alloys, the main segregation elements are Nb and Cr. Nb is a positive segregation element in this alloy system, and it is easy t...
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IPC IPC(8): G01N23/2251G01N23/2202
CPCG01N23/2202G01N23/2251
Inventor 陈文张雲飞赵英利孙中华嵇爽
Owner HEBEI IRON AND STEEL