A method for sintering and forming of steel samples with artificially implanted inclusions

Abstract

The invention provides a sintering forming method of a steel sample artificially implanted with inclusions, and relates to the field of rapid prototyping of materials. The method includes: selecting a graphite mold according to the steel sample to be sintered, filling part of the metal powder in the graphite mold, using an auxiliary positioning piece with a positioning hole to put the inclusions that need to be artificially implanted into a preset position, and then After filling the rest of the metal powder in the graphite mold, carry out pre-pressing operation; carry out discharge plasma sintering on the pre-pressed graphite mold, set a gradually slowing heating rate and finally reach the holding temperature, the holding temperature is 950-1050 ° C, and the holding temperature is 950-1050 ° C. The time is 15-25min, and the sintering pressure is 30-40Mpa. This method adopts the spark plasma sintering technology, puts the inclusions with known morphology and properties into a fixed position of the metal powder, combines them together by sintering, and finally obtains a metal sample containing inclusions with known positions inside. Sample.

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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