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| 不同路径对电子束熔丝沉积304不锈钢组织与性能的影响 |
| Effect of Different Paths on Microstructure and Properties of Electron Beam Fusion Deposition 304 Stainless Steel |
| Received:August 07, 2023 |
| DOI：10.3969/j.issn.1674-6457.2024.01.014 |
| 中文关键词: 电子束熔丝沉积 304不锈钢 成形路径 力学性能 显微组织 伸长率 |
| 英文关键词: EBF 304 stainless steel forming path mechanical properties microstructure elongation |
| 基金项目:广西创新驱动发展专项资金项目(AA18242046) |
| Author Name | Affiliation | | HUANG Xingguang | Guangxi Key Laboratory of Advanced Manufacturing and Automation Technology, Guilin University of Technology, Guangxi Guilin 541006, China
Guilin Shida Technology Co., Ltd., Guangxi Guilin 541004, China | | SUN Baofu | Guangxi Key Laboratory of Advanced Manufacturing and Automation Technology, Guilin University of Technology, Guangxi Guilin 541006, China | | CHEN Jiaqi | Guangxi Key Laboratory of Advanced Manufacturing and Automation Technology, Guilin University of Technology, Guangxi Guilin 541006, China |
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| 中文摘要: |
| 目的 采用电子束熔丝沉积方法进行打印，以获取具有高抗拉强度与高伸长率的304不锈钢。方法 以304不锈钢丝材为材料，当加速电压为60 kV、聚焦电流为430 mA、束流强度为22 mA、成形速度为250 mm/min、送丝速度为1 400 mm/min时，在成形路径为“弓字形”和“交替弓字形”条件下打印不锈钢样品，在样品x、y、z 3个方向上截取试样，采用金相、扫描电镜、透射电镜及拉伸试验等分析手段，对试样的微观组织和力学性能进行研究。结果 在“弓字形”成形路径下，产品x方向试样的显微组织主要以等轴晶为主，而y方向试样的显微组织以相互平行的柱状晶为主;在“交替弓字形”成形路径下，产品微观组织主要是相互垂直的柱状晶，在z方向试样中出现了位错胞结构。在“交替弓字形”成形路径下，z方向试样具有最优的综合力学性能，其致密度为98.60%，抗拉强度为(1 344±14)MPa，屈服强度为(701±7)MPa，断后伸长率为(25±0.4)%。结论 在EBF打印304不锈钢样品中，选用“交替弓字形”成形路径能使不锈钢具有更高的致密度，可以提升抗拉强度和屈服强度。 |
| 英文摘要: |
| The work aims to print through the electron beam fusion deposition method to obtain 304 stainless steel with high tensile strength and elongation. With 304 stainless steel wire as the material, the stainless steel samples were printed under the conditions of “crossbow” and “alternate crossbow” forming paths, respectively when the accelerating voltage was 60 kV, the focusing current was 430 mA, the beam intensity was 22 mA, the forming speed was 250 mm/min, and the wire feeding speed was 1 400 mm/min. Samples were taken in the x, y, and z directions of the samples, and analysis methods such as metallography, scanning electron microscopy, transmission electron microscopy, and tensile testing were used to study the microstructure and mechanical properties of the samples. The microstructure of the x-direction sample in the “crossbow” forming path was mainly composed of equiaxed grains, while the microstructure of the y-direction sample was mainly composed of parallel columnar grains; The microstructure of the “alternate crossbow” forming path product was mainly composed of mutually perpendicular columnar crystals, with dislocation cell structures appearing in the z-direction sample. The z-direction specimen of the “alternate crossbow” forming path product had the best comprehensive mechanical properties, with a density of 98.60%, a tensile strength of (1 344±14) MPa, a yield strength of (701±7) MPa, and an elongation after fracture of (25±0.4)%. In EBF printing of 304 stainless steel samples, the “alternate crossbow” forming path can make the stainless steel have higher density. It can improve tensile strength and yield strength. |
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