A heat treatment method for laser additive manufacturing of 24crnimoti alloy steel
A heat treatment method and laser additive technology, applied in heat treatment equipment, manufacturing tools, additive processing, etc., can solve the problems that have not yet been applied to the preparation of high-speed train brake discs, and achieve the effect of improving yield strength and tensile strength
Active Publication Date: 2020-09-15
辽宁增材智造科技有限公司 +1
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Problems solved by technology
Laser additive manufacturing technology is widely used, but it has not been applied to the preparation of high-speed train brake discs
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Embodiment 1
[0030] A heat treatment method for preparing 24CrNiMoTi alloy steel by laser additive manufacturing,
[0031] The laser additive manufacturing 24CrNiMoTi alloy steel used in this example is prepared by using a JK1002 single-mode continuous ytterbium-doped fiber laser. The process parameters are: laser power 300W, scanning speed 5mm / s, positive defocus amount 5mm, powder feeding rate 4g / s, the overlap rate is 40%, and the deposited sample is obtained.
[0032] The size of the as-deposited sample is 40mm×15mm×10mm. After testing, the grain size of the deposited sample is 3-5 μm, the density of the deposited sample is 97%, the microhardness is 420HV, the yield strength is 610MPa, the tensile strength is 1230MPa, the elongation is 10.9%, and the microstructure is bainite.
[0033] The heat treatment step described in this embodiment is as follows: the product obtained in the laser additive manufacturing technology step is first solution treated at 880 ° C for 10 minutes, and the...
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Abstract
The invention relates to a heat treatment method for preparing 24CrNiMoTi alloy steel by laser additive manufacturing, and belongs to the technical field of heat treatment of low alloy steel by laser additive manufacturing. The method includes solution treatment, oil quenching, and tempering steps. The solution treatment step is to heat the 24CrNiMoTi alloy steel manufactured by laser additives at 800-950°C for 5-30 minutes. The oil quenching step is to solid solution After treatment, the alloy steel is directly quenched into quenching oil and cooled to room temperature. The tempering step is tempering and heat preservation at 100-300°C for 5-30 minutes, and the air is cooled to room temperature after exiting the furnace. This invention realizes the improvement of material properties after laser additive manufacturing. On the basis of laser additive manufacturing, it also improves the structure through heat treatment methods of solid solution treatment, quenching and tempering, while ensuring the elongation. Under the conditions, the properties such as yield strength, tensile strength and hardness of the material are improved.
Description
technical field [0001] The invention relates to a heat treatment method for manufacturing 24CrNiMoTi alloy steel by laser additive manufacturing, and belongs to the heat treatment field of laser additive manufacturing technology. Background technique [0002] my country's high-speed rail has developed rapidly in recent years, and train safety issues have attracted widespread attention. Brake discs are the key safety components for high-speed rail braking. The high-speed rail brake disc has a complex structure and internal heat dissipation ribs, which is not easy to cast and produce. Therefore, it is produced by laser additive manufacturing and post-heat treatment. Laser additive manufacturing technology is widely used, but it has not been applied to the preparation of high-speed train brake discs. 24CrNiMoTi is a low-carbon low-alloy steel whose content of alloying elements does not exceed 5%. Cr and Ni can improve the hardenability of steel, and the addition of Mo and Ti ...
Claims
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IPC IPC(8): C21D1/18C21D1/58B33Y70/00
CPCB33Y70/00C21D1/18C21D1/58C21D2211/008
Inventor 梁京郭洋陈岁元刘常升陈月虎
Owner 辽宁增材智造科技有限公司