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Preparation method of powder high-speed steel material

A high-speed steel and powder technology, which is applied in the field of powder high-speed steel material preparation, can solve the problems of reduced mechanical properties, complex sintering process, high sintering temperature, etc., and achieve the effects of lower sintering temperature, easy process control, and expanded sintering temperature range

Inactive Publication Date: 2013-06-05
JIANGSU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of high sintering temperature in the traditional molding sintering process, the expansion of the sintering temperature range, and the decrease in mechanical properties, while the hot isostatic pressing sintering process has complex sintering processes and high costs, the present invention provides a method for preparing powdered high-speed steel materials. The method provided by the invention adopts the method of pulse activation and carbon powder activation sintering to reduce the sintering temperature, and uses the pulse to form plasma activation sintering to shorten the sintering time, so that no segregation or less segregation, fine and uniform grain can be obtained, and the mechanical properties of high-speed steel can be improved. performance

Method used

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  • Preparation method of powder high-speed steel material
  • Preparation method of powder high-speed steel material
  • Preparation method of powder high-speed steel material

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Embodiment 1

[0023] Embodiment 1: In this embodiment, powder high-speed steel is prepared according to the following steps:

[0024] (1) The master alloy powder and additives were placed in a planetary mixer and mixed for 8 hours at a speed of 120 rpm. The master alloy is M3:2 high-speed steel powder with low carbon content; the additive is carbon powder, and its content relative to the master alloy is 0.15-0.25wt% of carbon powder in terms of mass percentage.

[0025] (2) The high-speed steel powder is vacuum sintered in a spark plasma sintering furnace at a sintering temperature of 870-890°C for 10 minutes. The vacuum sintering process is divided into four stages: ① After applying a pressure of 30MPa to the powder, vacuumize the vacuum to lower than 10Pa, then raise the temperature to 500℃ at a faster heating rate (average 20℃ / min); ② use 10℃ / min The heating rate is raised to the sintering temperature; ③keep at the sintering temperature for 10 minutes (the allowable temperature change o...

Embodiment 2

[0028] Embodiment 2: The differences between this embodiment and Embodiment 1 are: no carbon powder is added, and the sintering temperature is 890-910°C. Others are the same as in Embodiment 1.

Embodiment 3 Embodiment and Embodiment 1 ：，；1，3，，550℃。 other and Embodiment 1 。 Embodiment 59～62HRC。 Embodiment 4

[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 is: the high-speed steel is directly placed in a box-type tempering furnace for tempering after sintering, and the quenching heat treatment process is omitted; the tempering time is 1 hour, the tempering times are 3 times, and air cooling , the tempering temperature is chosen to be 550°C. Others are the same as in Embodiment 1. The implementation hardness is reduced to 59-62HRC. Embodiment four: the difference between this embodiment and embodiment three is: when cooling with the furnace, nitrogen gas is charged with a pressure of 0.04 MPa to accelerate cooling. Others are the same as the third embodiment.

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Abstract

The invention provides a method for preparing a powder high-speed steel structural member by discharge plasma sintering. In the process of preparing high-speed steel, the addition of carbon powder and the activation action of plasma are utilized to lower the sintering temperature of the high-speed steel, and the activation action of the plasma is utilized to shorten the holding time. The sintering temperature is 870-890 DEG C, the sintering temperature range is 20 DEG C, the sintering time is 10 minutes, and the technique is easy to control. The invention solves the problem of segregation of high-speed steel, refines the crystal grains, and enhances the mechanical properties of the high-speed steel.

Description

technical field [0001] The invention relates to a method for preparing a powder high-speed steel material. Background technique [0002] The high-speed steel used in the machinery manufacturing industry is produced by the powder sintering process. The process is simple and easy. Compared with the traditional casting and forging plus cutting process, the material utilization rate has been greatly improved, which can be increased from 40-50% to 95%. above. Compared with ordinary high-speed steel, because the powder sintering process has the advantages of controllable carbide particles, uniform distribution, and no segregation, the powder process can produce high-speed steel products with better strength and toughness. The theory of powder-related solidification structure, sintering behavior, and fracture mechanism has not been fully established. Finding a more suitable production process for high-speed steel sintering and exploring ways to improve the mechanical properties of...

Claims

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Application Information

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IPC IPC(8): C22C33/02C22C38/24
Inventor 周瑞孙桂芳张满奎冯爱新王昆丁吉
Owner JIANGSU UNIV
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