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Study on the Effects of Helium-Argon Gas Mixture on the Laser Welding Performance of High Temperature Alloys
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作者 Xiongzi CHEN Hesi PENG +2 位作者 Chunchen YAO Yu DAI Yewen QIN 《Research and Application of Materials Science》 2023年第2期21-24,共4页
In order to solve the problem of porosity in laser deep penetration welding of GH3625 high-temperature alloy plates,five different ratios of high-purity helium gas and high-purity argon gas mixed gases were compared i... In order to solve the problem of porosity in laser deep penetration welding of GH3625 high-temperature alloy plates,five different ratios of high-purity helium gas and high-purity argon gas mixed gases were compared in welding experiments after various process parameter improvements and adjustments failed to achieve Class I welds.The experimental results show that using high-purity helium gas or a mixture of 50%high-purity helium gas and 50%high-purity argon gas can both achieve Class I welds.This indicates that using high-purity helium gas or an appropriate mixed gas instead of pure argon is one of the effective ways to solve the problem of porosity in laser deep penetration welding of high-temperature alloys.The mixture of 50%high-purity argon gas and 50%high-purity helium gas can reduce the consumption of high-purity helium gas,lower production costs,and is more suitable. 展开更多
关键词 high-temperature alloy laser welding pores shielding gas welding quality
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EVOLUTION OF MICROSTRUCTURE OF LASER SURFACE ALLOYING OF γ TiAi ALLOY WITH NITROGEN 被引量:1
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作者 D.Wen 1) , Q.K.Cai 2) ,C.S. Liu 1) , Y.J. Guo 1) and Y.H.Zhao 1) 1) School of Materials and Metallurgy, Northeastern University, Shenyang 110006,China 2) Shenyang University, Shenyang 110044, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期860-866,共7页
Laser surface alloying of γ TiAl alloy with nitrogen was studied under the constant protective nitrogen current (20l /min). The experimental results shown that the surface multi layers formed with experimental para... Laser surface alloying of γ TiAl alloy with nitrogen was studied under the constant protective nitrogen current (20l /min). The experimental results shown that the surface multi layers formed with experimental parameters could be up to 600μm depth; it consists of TiN,Ti 2AlN,α 2 and γ phases, without AlN, and the irregular coarse continuous “flow” line,dendrite,needle and granular nitrides disperse on the fine dendrite casting α 2 and γ phases substrate. The microstructure and compositions in the nitiding layer were determined and analyzed by SEM and EPMA and the mechanism for the formation of microstructure in the nitriding layer was also discussed. 展开更多
关键词 laser surface alloying gas nitiding MICROSTRUCTURE
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Effects of activating flux on CO_2 laser welding process of 6013 Al alloy 被引量:11
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作者 QIN Guo-liang WANG Guo-gang ZOU Zeng-da 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第1期23-29,共7页
In order to increase the absorption of laser energy and improve the weld appearance in laser welding of Al alloy, 1.8 mm- 6013 Al alloy plate was welded by activating flux CO2 laser welding. Activating flux includes o... In order to increase the absorption of laser energy and improve the weld appearance in laser welding of Al alloy, 1.8 mm- 6013 Al alloy plate was welded by activating flux CO2 laser welding. Activating flux includes oxide and fluoride, which was coated on the workpiece surface before welding. The experimental results show that the activating flux can effectively improve the absorption of CO2 laser energy and increase the amount of the molten base metal. The improvement on the absorption of laser energy by oxide activating flux is greater than that by fluoride activating flux or two-component activating flux, but the slag detachability made from both the single activating flux and two-activating flux is poor. The gas pore sensitivity with oxide activating flux is much higher than that with fluoride activating flux in CO2 laser welding of 6013 Al alloy. 展开更多
关键词 laser welding aluminum alloy activating flux weld appearance gas pore
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Co_(47.5)Fe_(28.·5)Ni_(19)Si_(3.3)Al_(1.7)High-entropy Skeletons Fabricated by Selective Laser Melting and Properties tuned by pressure infiltration of Al 被引量:1
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作者 Yaqi WU Yongsen CAI +2 位作者 Jinpeng HAO Guihong GENG Yong ZHANG 《Research and Application of Materials Science》 2022年第2期24-29,共6页
High saturation magnetization and low coercivity are required for soft magnetic materials.This study investigated the Co_(47.5)Fe_(28.5)Ni_(19)Si_(3.3)Al_(1.7)high-entropy soft magnetic skeleton was prepared by select... High saturation magnetization and low coercivity are required for soft magnetic materials.This study investigated the Co_(47.5)Fe_(28.5)Ni_(19)Si_(3.3)Al_(1.7)high-entropy soft magnetic skeleton was prepared by selective laser melting.Then Al wpressure infiltrated into skeletons to obtain a dense composite material.The high-entropy composite materials possessed favorable compressive ductility and moderate soft magnetic properties.The high-entropy composite materials were obtained with Ms being 97.1 emu/g,79.8 emu/g,33 emu/g and possessing 19 Oe,15.8Oe and 17Oe of Hc,respectively.However,the magnetostriction coefficient remains low level,about 5ppm.These reported properties are attributed to the special structure of the material studied in present experiment.Nevertheless,a novel strategy of structural designing was proposed in this paper. 展开更多
关键词 High entropy alloy Composite material Selective laser melting gas pressure infiltration Soft Magnetic Properties
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Ti表面脉冲激光氮化成膜温度场的数值模拟 被引量:7
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作者 高昕 宋宙模 《激光杂志》 CAS CSCD 北大核心 2000年第2期62-63,共2页
本文用有限差分法对金属钛表面脉冲激光生成氮化钛薄膜过程的温度场进行了三维数值模拟计算。模型主要考虑了入射的脉冲激光在时间与空间上的Gauss分布特性 ,以及工件的有限尺寸 ,工件材料热物理性质的温度依赖关系 ,对流辐射造成的表... 本文用有限差分法对金属钛表面脉冲激光生成氮化钛薄膜过程的温度场进行了三维数值模拟计算。模型主要考虑了入射的脉冲激光在时间与空间上的Gauss分布特性 ,以及工件的有限尺寸 ,工件材料热物理性质的温度依赖关系 ,对流辐射造成的表面热损失。此外还从理论上计算了激光脉冲在脉冲宽度加宽后的温度场变化。 展开更多
关键词 数值模拟 钛表面 脉冲激光 氮化成膜 温度场
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脉冲激光钼表面氮化处理温度场的数值模拟 被引量:1
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作者 高昕 苏增立 《量子电子学报》 CAS CSCD 北大核心 2001年第1期41-45,共5页
本文用有限差分法对金属钼表面脉冲激光生成氮化用薄膜过程的温度场进行了三维数值模拟计算.计算模型在能量平衡方程的基础上,将入射的脉冲激光在时间与空间上的分布以Gauss分布考虑,同时考虑工件尺寸、工件材料热物理性质及对... 本文用有限差分法对金属钼表面脉冲激光生成氮化用薄膜过程的温度场进行了三维数值模拟计算.计算模型在能量平衡方程的基础上,将入射的脉冲激光在时间与空间上的分布以Gauss分布考虑,同时考虑工件尺寸、工件材料热物理性质及对流辐射造成的表面热损失等对温度场的影响.此外还从理论上计算了激光脉冲在脉冲宽度加宽后的温度场变化,分析了利用长脉冲激光进行材料表面相变硬化和激光重熔的可行性. 展开更多
关键词 数值模拟 温度场 脉冲激光 表面氮化处理
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Influence of welding processes on microstructure, tensile and impact properties of Ti-6Al-4V alloy joints 被引量:12
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作者 T. S. BALASUBRAMANIAN M. BALAKRISHNAN +1 位作者 V. BALASUBRAMANIAN M. A. MUTHU MANICKAM 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第6期1253-1262,共10页
Titanium alloys have been successfully applied for aerospace, ship and chemical industries because they possess many good characteristics such as high specific strength, superior corrosion resistance and excellent hig... Titanium alloys have been successfully applied for aerospace, ship and chemical industries because they possess many good characteristics such as high specific strength, superior corrosion resistance and excellent high temperature resistance. Though these alloys show reasonable weldability characteristics, the joint properties are greatly influenced by the welding processes. Weld thermal cycle of the processes will control the weld metal solidification and subsequent phase transformation and resultant microstructure. The welded joints of Ti-6Al-4V alloy were fabricated by gas tungsten arc welding (GTAW), laser beam welding (LBW) and electron beam welding (EBW) processes. The joints fabricated by EBW process exhibit higher strength compared with the GTAW and LBW joints; but the joints by GTAW process exhibit higher impact toughness compared with the LBW and EBW joints. The resultant tensile and impact properties of the welded joints were correlated with the weld metal microstructures. 展开更多
关键词 titanium alloy gas tungsten arc welding laser beam welding electron beam welding
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Microstructure and Mechanical Properties of AlSi10Mg Alloy Manufactured by Laser Powder Bed Fusion Under Nitrogen and Argon Atmosphere 被引量:5
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作者 Yunmian Xiao Yongqiang Yang +3 位作者 Shibiao Wu Jie Chen Di Wang Changhui Song 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第3期486-500,共15页
In order to study the effect of gas atmosphere on forming performance of laser powder bed fusion(LPBF),AlSi10 Mg alloy was prepared by direct forming and in situ laser remelting under the shielding gas of argon and ni... In order to study the effect of gas atmosphere on forming performance of laser powder bed fusion(LPBF),AlSi10 Mg alloy was prepared by direct forming and in situ laser remelting under the shielding gas of argon and nitrogen in this study,and its micro structure and properties were characterized and tested,respectively.The results show that the forming performance of AlSi10 Mg under nitrogen atmosphere is better than that of argon.Moreover,in situ laser remelting method can effectively enhance the relative density and mechanical properties of AlSi10 Mg,in which the densification is increased to 99.5%.In terms of mechanical properties,after in situ remelting,ultimate tensile strength under argon protection increased from444.85±8.73 to 489.45±3.20 MPa,and that under nitrogen protection increased from 459.21±13.77 to 500.14±5.15 MPa.In addition,the elongation is nearly doubled and the micro-Vickers hardness is increased by 20%.The research results provide a new regulation control method for the customization of AlSi10 Mg properties fabricated by LPBF. 展开更多
关键词 In situ laser remelting laser powder bed fusion AlSi10Mg alloy Mechanical properties Shielding gas
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