水冷双气道激光成形侧向送粉喷嘴特性研究

张振远; 邱长军; 李胜; 张聪

doi:10.12073/j.hj.20190123002

水冷双气道激光成形侧向送粉喷嘴特性研究

南华大学, 湖南衡阳 421001

基金项目:

国家自然科学基金项目(51474130)

湖南省高校重点实验室(湘财教指[2014]85号)

湖南省重点学科建设项目(湘教发[2011]76号)

湖南省高校科技创新团队支持计划(湘教通[2012]318号)

南华大学研究生科学基金项目资助(2018KYY053)。

详细信息

作者简介:
张振远,1990年出生,硕士研究生;主要从事激光制造的工作;已发表论文1篇。

通讯作者:
邱长军,1965年出生,博士,教授

中图分类号: TG439.4
计量
- 文章访问数: 14
- HTML全文浏览量: 2
- PDF下载量: 14
出版历程
- 收稿日期: 2019-01-22

Study on characteristics of the double-side feeding nozzle with water cooling for laser forming

University of South China, Hengyang421001, Hunan, China

摘要

摘要: 采用水冷双气道激光成形侧向送粉喷嘴研究出粉口离熔池工作高度、外部雾化气流对粉末利用率和熔池中心氧含量的影响,载粉气流量与熔池中心氧含量关系及外部雾化气流对熔池中心氧含量的影响,外部雾化气流对CH化合物包覆304不锈钢激光成形试样氧化夹渣与力学性能的影响。结果表明，随出粉口离熔池中心高度的增加，粉末利用率逐渐降低，氧含量逐渐增大；仅有载粉气流量1～12 L/min时,氧含量为3.92%～5.48%;当载粉气流量1～12 L/min、外部雾化气流1～5 L/min时,氧含量为1.40%～2.68%；激光成形试样内部夹渣明显减少且表面呈金属光泽，其抗拉强度、断后伸长率比单气道送粉喷嘴制备的试样分别提高7.8%和23.1%。
- 激光成形 /
- 侧向送粉喷嘴 /
- 粉末利用率 /
- 双气道保护 /
- 氧含量
Abstract: A double-side feeding nozzle with water cooling for laser cladding was designed. Effects of the working height between the powder outlet and the molten pool,together with the external protective gas flow on powder utilization and oxygen content in the molten pool were carefully investigated. Influence of the powder-carrying gas flow on oxygen content in the molten pool was explored. Effects of the external protective gas curtain on oxidation,slag inclusion and mechanical properties of hydrocarbon-coated 304 stainless steel specimens by laser cladding were studied. The results indicate that powder utilization gradually decreased and oxygen content in the molten pool increased with the increase of the working height between the powder outlet and the molten pool. Oxygen content in the molten pool was 3. 92% ～ 5. 48% when powdercarrying gas flow was only 1 ～ 12 L/min. Oxygen content in the molten pool decreased to 1. 40% ～ 2. 68% when powder-carrying gas flow was1 ～ 12 L/min and external protective gas flow was 1 ～ 5 L/min. The slag inside the laser forming specimen was significantly reduced and the surface exhibited a metallic luster. The tensile strength and elongation of the specimens were enhanced by 7. 8% and 23. 1% in comparison to those specimens prepared using the single-side feeding nozzle.
- laser forming /
- lateral feeding nozzle /
- powder utilization /
- double airway protection /
- oxygen content

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参考文献(14)

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