沉积效率对激光近净成形316L不锈钢组织及性能的影响
发布时间：2018-09-17 10:15
【摘要】：利用激光近净成形技术进行了316L不锈钢单道多层结构的制备。在相同的激光功率及扫描速度条件下,通过调整送粉率及层间提升量实现了不同沉积效率的成形,并讨论了不同沉积效率下成形结构的微观组织及力学性能特征。结果表明,在一定的激光功率及扫描速度条件下,随着送粉率及层间提升量的提升,沉积效率由初始工艺参数条件下的12.14 mm~3/s提高至22.62 mm~3/s,提高了86.3%。同时成形单位有效体积消耗的激光能量由初始工艺参数条件下的98.84 J/mm~3降低至53.06 J/mm~3,能量利用效率提高了46.32%。成形结构的微观组织呈柱状枝晶形态,随着沉积效率的提高,枝晶长度呈明显的增大趋势。性能检测结果显示,不同沉积效率下的样件力学性能保持了较高的一致性,并未随沉积效率的提高而降低,成形样件抗拉强度及屈服强度分别稳定在510 MPa与290 MPa,延伸率稳定在40%左右,显微硬度也未出现明显波动,处于180 HV,均达到了锻造的同等水平。该研究表明,在一定的工艺参数范围内,可以实现沉积效率及力学性能的协同优化,达到低能耗高效制备高性能零件的效果。
[Abstract]:The single pass multilayer structure of 316L stainless steel was fabricated by laser near-net forming technique. Under the same laser power and scanning speed, the formation of different deposition efficiency is realized by adjusting the powder feeding rate and the lifting amount between layers, and the microstructure and mechanical properties of the formed structure are discussed under different deposition efficiency. The results show that under certain laser power and scanning speed, the deposition efficiency increases from 12.14 mm~3/s to 22.62 mm~3/s, with the increase of powder feeding rate and interlayer lift. At the same time, the laser energy consumed by the effective volume of the forming unit is reduced from 98.84 J/mm~3 to 53.06 J / mm3 under the initial process parameters, and the energy utilization efficiency is increased by 46.32 2%. The microstructure of the formed structure is columnar dendritic, and the dendritic length increases obviously with the increase of deposition efficiency. The results of performance test show that the mechanical properties of the samples with different deposition efficiency have high consistency and do not decrease with the increase of deposition efficiency. The tensile strength and yield strength of the formed samples are stable at 510 MPa and 290 MPa, respectively, and the elongation is about 40%, and the microhardness does not fluctuate obviously, reaching the same level as that of forging at 180 HV,. The research shows that the deposition efficiency and mechanical properties can be optimized in a certain range of process parameters, and the effect of producing high performance parts with low energy consumption and high efficiency can be achieved.
【作者单位】： 大连理工大学精密与特种加工教育部重点实验室;大连三垒机器股份有限公司;
【基金】：国家自然科学基金(51402037) 国家重点基础研究发展计划(2015CB057305)
【分类号】：TG142.71;TG665
本文编号：2245548
[Abstract]:The single pass multilayer structure of 316L stainless steel was fabricated by laser near-net forming technique. Under the same laser power and scanning speed, the formation of different deposition efficiency is realized by adjusting the powder feeding rate and the lifting amount between layers, and the microstructure and mechanical properties of the formed structure are discussed under different deposition efficiency. The results show that under certain laser power and scanning speed, the deposition efficiency increases from 12.14 mm~3/s to 22.62 mm~3/s, with the increase of powder feeding rate and interlayer lift. At the same time, the laser energy consumed by the effective volume of the forming unit is reduced from 98.84 J/mm~3 to 53.06 J / mm3 under the initial process parameters, and the energy utilization efficiency is increased by 46.32 2%. The microstructure of the formed structure is columnar dendritic, and the dendritic length increases obviously with the increase of deposition efficiency. The results of performance test show that the mechanical properties of the samples with different deposition efficiency have high consistency and do not decrease with the increase of deposition efficiency. The tensile strength and yield strength of the formed samples are stable at 510 MPa and 290 MPa, respectively, and the elongation is about 40%, and the microhardness does not fluctuate obviously, reaching the same level as that of forging at 180 HV,. The research shows that the deposition efficiency and mechanical properties can be optimized in a certain range of process parameters, and the effect of producing high performance parts with low energy consumption and high efficiency can be achieved.
【作者单位】： 大连理工大学精密与特种加工教育部重点实验室;大连三垒机器股份有限公司;
【基金】：国家自然科学基金(51402037) 国家重点基础研究发展计划(2015CB057305)
【分类号】：TG142.71;TG665
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