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开放条件下气流对激光重熔过程中氧化行为的影响
叶正挺1,2, 方铮1,2, 杨高林1,2, 张群莉1,2, VOLODYMYR Kovalenko3, 姚建华1,2
1.浙江工业大学 激光先进制造研究院, 杭州 310014;2.浙江省高端激光制造装备协同创新中心, 杭州 310014;3.乌克兰国立科技大学 激光技术研究所, 乌克兰 基辅 03056
摘要:
在激光加工过程中,保护气和载粉气对熔池氧含量有很重要的影响,为了减少在开放条件下激光加工过程中产生的氧化,需要研究保护气和载粉气工艺参数对激光加工过程中氧化行为的影响。以激光重熔45钢为例,通过测定熔池上方气氛以及重熔后基材表层的氧含量,对比研究了不同保护气流量、载粉气流量和离焦量对激光重熔过程中氧化行为的影响。结果表明:气流量较低时,气流卷吸周围空气,载粉气流量、保护气流量以及离焦量升高会加剧激光重熔时的氧化。当载粉气流量超过84 L/min时,大量氩气对周围空气进行了稀释,熔池上方气氛中的氧含量会有所降低。但是保护气流量过高会加剧熔池飞溅。降低熔池上方气氛中氧含量的气流量工艺参数为:保护气流量8.5 L/min,载粉气流量6.5 L/min。
关键词:  激光重熔  保护气  载粉气  离焦量  氧化
DOI:10.11933/j.issn.1007-9289.20180918001
分类号:TG174.44
基金项目:浙江省自然科学基金(LY16E050014);国家重点研发计划项目(2018YFB0407300);凝固技术国家重点实验室开放课题(SKLSP201745)
Influence of Gas Flow on Oxidation of Molten Pool During Laser Remelting Under Open-air Condition
YE Zhengting1,2, FANG Zheng1,2, YANG Gaolin1,2, ZHANG Qunli1,2, VOLODYMYR Kovalenko3, YAO Jianhua1,2
1.Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China;2.Zhejiang Provincial Collaborative Innovation Center of High-End Laser Manufacturing Equipment, Hangzhou 310014, China;3.Laser Technology Research Institute, National Technical University of Ukraine, Kyiv 03056, Ukraine
Abstract:
Protective gas and carrier gas have significant effects on the oxygen content of molten pool in laser processing. To minimize the oxidation of laser processing in the air condition, the effects of protective gas and carrier gas on the oxidation of the molten pool during processing should be studied. In this research, laser remelting of 45 steel was taken as an example. The effects of protective gas flow, carrier gas flow and laser defocusing on the oxidation of the molten pool during laser remelting were investigated by measuring the oxygen content over the molten pool and laser remelted surface layer. Results show that the gas flow entrains the surrounding air when it is low. With the increase of carrier gas flow, protective gas flow and defocusing amount, surface oxidation of the substrate is aggravated during laser remelting. When carrier gas flow exceeds 84 L/min, the oxygen content over the molten pool will be reduced due to the dilution of the surrounding air by a large amount of argon. However, high flow rate aggravates the spatter of molten pool. The process parameters of reducing oxygen content in the atmosphere above the molten pool are as follows:protective gas flow is 8.5 L/min and carrier gas flow is 6.5 L/min.
Key words:  laser remelting  protective gas  carrier gas  laser defocusing  oxidation