Sintering forming method of steel sample with impurities implanted manually

Abstract

The invention provides a sintering forming method of a steel sample with impurities implanted manually, and relates to the field of rapid forming of materials. The sintering forming method comprises the steps that a graphite mold is selected according to a steel sample to be sintered, the graphite mold is filled with part of metal powder, an auxiliary positioning piece with a positioning hole is used for placing inclusions needing to be implanted manually into a preset position, then the graphite mold is filled with the remaining part of metal powder, and then pre-pressing operation is carriedout; and spark plasma sintering is carried out on the pre-pressed graphite mold, the gradually-slowed heating rate is set to finally reach the heat preservation temperature, the heat preservation temperature ranges from 950 DEG C to 1050 DEG C, the heat preservation time ranges from 15 min to 25 min, and the sintering pressure ranges from 30 Mpa to 40 Mpa. According to the sintering forming method, a spark plasma sintering technology is adopted, the inclusions with known shapes and properties are put into a certain fixed position of the metal powder and are combined with the metal powder together through a sintering method, and finally, the metal sample with the inclusions with known positions inside is obtained.

Description

technical field [0001] The invention belongs to the field of rapid prototyping of materials, and more specifically relates to a method for sintering and forming a steel sample by artificially implanting inclusions. Background technique [0002] At present, due to the strict requirements of large-scale forgings and aviation die forgings on steel materials, the research focus of my country's iron and steel industry is gradually shifting to the "cleanliness" of steel, and the inclusions in steel have a non-negligible impact on the quality of steel. , the existence of inclusions often leads to the scrapping of steel during forging, which causes economic losses. Although with the development of steelmaking technology, the current technical means have been able to remove some inclusions in the steelmaking process, but they cannot completely eliminate steel. Therefore, it is of practical significance to study the deformation mechanism of inclusions in steel during forging, and the ba...

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Problems solved by technology

[0002] At present, due to the strict requirements of large-scale forgings and aviation die forgings on steel materials, the research focus of my country's iron and steel industry is gradually shifting to the "cleanliness" of steel, and the inclusions in steel have a non-negligible impact on the quality of steel. , the existence of inclusions often leads to the scrapping of steel during forging, which causes economic losses. Although with the development of steelmaking technology, the current technical means have been able to remove some inclusions in the steelmaking process, but they cannot completely eliminate steel. Therefore, it is of practical significance to study the deformation mechanism of inclusions in steel during forging, and the basis for studying inclusions in steel is to have metal samples with artificially implanted inclusions

[0003] At present, the methods for preparing metal samples containing inclusions at home and abroad can be divided into two categories, that is, implantation in the smelting process and implantation by welding. The implantation of inclusions by welding is to destroy part of the metal matrix and artificially Adding inclusions and then welding the metal matrix, although the position of the implanted inclusions inside the metal matrix can be determined, but the continuity of the metal matrix is ​​destroyed and the inclusions cannot be well combined with the metal by welding , which affects the accuracy of subsequent experimental research results; the method of implanting inclusions in the smelting process is to add inclusions when the steel is in a molten state and finally form them together. This method does not destroy the continuity of the metal, but because The fluidity of the molten metal makes it impossible to accurately locate the implanted inclusions, which will cause difficulties and limitations to the subsequent research on inclusions in steel

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