A method to improve the yield strength of 3D printed 17-4ph stainless steel

A 3D printing, yield strength technology, applied in the field of metal materials, can solve the problem of low yield strength, and achieve the effect of increasing yield strength, reducing content, and improving hardenability

Active Publication Date: 2018-09-14
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

There have been related reports at home and abroad on the preparation of 17-4PH stainless steel materials by 3D printing technology. The printing methods used include powder bed printing and laser powder feeding and accumulation. However, from the performance of the reports, no matter which printing method is used, Its yield strength is very low, basically in the range of 540MPa-590MPa, which is far below the level of forgings and standard requirements. Therefore, how to improve the yield strength of 3D printed 17-4PH stainless steel to meet the standard requirements is the key to its application

Method used

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  • A method to improve the yield strength of 3D printed 17-4ph stainless steel

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Embodiment Construction

[0011] (1) Add 5wt% TiB by powder bed laser printing 2 The 17-4PH stainless steel first uses gas-atomized 17-4PH stainless steel powder with a particle size of less than 50 μm, and TiB with a particle size of less than 5 μm 2 Particles, the proportion of TiB2 is 5wt%, the total weight of the two is 5kg, and then ball milled. During the ball milling process, the ball-to-material ratio is 5:1, the rotational speed is 160 rpm, and the ball milling time is 60 minutes. At this time, TiB 2 Particles can be evenly attached to the surface of 17-4PH stainless steel powder, and then placed in a powder bed laser printer for printing. The printing atmosphere is a nitrogen atmosphere, the laser power is 250W, the scanning speed is 730mm / s, the laser spot diameter is 100μm, and the printing size is 50mm (length) × 50mm (width) × 30mm (height), the thickness of each layer of powder coating is 60μm, the angle between layers is 60°, and the temperature of the substrate is kept below 100°C. A...

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Abstract

The invention provides a method for improving the yield strength of 3D printing 17‑4PH stainless steel. When the powder additive technology is used to prepare 17-4PH stainless steel, the yield strength is low due to the large amount of retained austenite. The present invention adds an appropriate amount of TiB particles to the 17-4PH powder, and makes it adhere to the surface of the powder particles by ball milling. Nitrogen atmosphere is used for protection. During the printing process, TiB2 reacts with laser and melts and decomposes into Ti element and B element. Ti element reacts with nitrogen atmosphere to form TiN particles. On the one hand, the generated TiN can be used as a nucleating agent to refine the grain On the other hand, it can be used as the second phase for dispersion strengthening, and the B element produced by the decomposition can be partially dissolved into the matrix to improve the hardenability of the steel and reduce the content of retained austenite. The comprehensive effect of the three is finally The yield strength can be increased from the current 500‑600MPa to more than 1000MPa.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a method for improving the yield strength of 3D printing 17-4PH stainless steel. Background technique [0002] 17-4PH stainless steel belongs to precipitation hardening stainless steel, which has high strength and excellent corrosion resistance, and has been widely used in petroleum and petrochemical fields. Powder additive manufacturing, or 3D printing technology, is based on digital models and constructs three-dimensional entities through layer-by-layer melting and accumulation. It has great potential in the direct forming of metal parts with arbitrary complex shapes. This technology will lead to profound changes in product design, manufacturing process, manufacturing equipment, material preparation, and even the entire traditional manufacturing industry. It has attracted great attention from all countries in the world and has developed rapidly. According to different raw material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02B22F3/105B22F1/00B33Y10/00B33Y70/00
CPCB22F1/0003C22C33/02B33Y10/00B33Y70/00B22F10/00B22F10/38B22F10/36B22F10/20B22F10/32Y02P10/25
Inventor 任淑彬陈玉红曲选辉
Owner UNIV OF SCI & TECH BEIJING
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