Porosity control of Inconel 718 in high deposition-rate laser metal deposition

ZHONG Chong-liang; FU Jin-bao; DING Ya-lin; ANDRES Gasser

doi:10.3788/OPE.20152311.3005

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Porosity control of Inconel 718 in high deposition-rate laser metal deposition

更新时间：2020-08-13

- Porosity control of Inconel 718 in high deposition-rate laser metal deposition
- Optics and Precision Engineering Vol. 23, Issue 11, Pages: 3005-3011(2015)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院大学北京,中国,100049
  3. Fraunhofer激光技术研究所, Germany Aachen,52074
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152311.3005
  CLC： TG442;TG456.7
- Received：06 March 2015，
  
  Revised：07 April 2015，
  
  Published：25 November 2015
- 稿件说明：
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仲崇亮, 付金宝, 丁亚林等. 高沉积率激光金属沉积Inconel 718的孔隙率控制[J]. 光学精密工程, 2015,23(11): 3005-3011

ZHONG Chong-liang, FU Jin-bao, DING Ya-lin etc. Porosity control of Inconel 718 in high deposition-rate laser metal deposition[J]. Editorial Office of Optics and Precision Engineering, 2015,23(11): 3005-3011
仲崇亮, 付金宝, 丁亚林等. 高沉积率激光金属沉积Inconel 718的孔隙率控制[J]. 光学精密工程, 2015,23(11): 3005-3011 DOI： 10.3788/OPE.20152311.3005.

ZHONG Chong-liang, FU Jin-bao, DING Ya-lin etc. Porosity control of Inconel 718 in high deposition-rate laser metal deposition[J]. Editorial Office of Optics and Precision Engineering, 2015,23(11): 3005-3011 DOI： 10.3788/OPE.20152311.3005.

摘要

为降低高沉积率激光金属沉积(Laser Metal Deposition

LMD)工艺中材料的孔隙率

研究了以镍基高温合金Inconel 718(IN718)为粉末沉积材料的高沉积率LMD工艺中主要工艺参数对材料孔隙率的影响

以及通过调整工艺参数降低材料孔隙率的方法。以目标沉积率为2 kg/h的LMD工艺为基础

通过参数固化和分离的手段开展了高沉积率LMD的镀层实验

研究了主要工艺参数即激光功率、扫描速度及送粉量对LMD镀层材料孔隙率的影响

分析了不同参数下各镀层的横截面孔隙率及镀层孔隙率。实验显示:当激光功率从1440 W增加到4214 W时

镀层材料的孔隙率从约1.5%降低至0.02%左右;当扫描速度为500 mm/min至5000 mm/min时

镀层材料孔隙率始终保持为0.07%至0.18%左右;当送粉量从0.64 kg/h增加至6.48 kg/h时

镀层材料孔隙率从约0.01%增加至0.84%左右。可见在高沉积率LMD工艺中

扫描速度对材料孔隙率无明显影响

而提高激光功率、限制送粉量均可有效降低LMD材料孔隙率

提高横截面孔隙率的一致性。

Abstract

To reduce the material porosity in Laser Metal Deposition(LMD) processing

the Inconel 718(IN718) was used as powder additive in this study

and the influences of main process parameters on the material porosity in a high deposition-rate LMD were investigated. Then

the methods to reduce the material porosity were researched by adjusting these process parameters. Based on the newly developed target with a high deposition rate by 2 kg/h in the LMD process

a coating experiment was performed by parameter solidification and parameter separation and the effects of laser power

scanning speed and powder mass flow on the material porosity were designed and carried out. Furthermore

the cross-sectional porosity and track porosity of tracks deposited by different process parameters were analyzed. The results show that as the laser power increases from 1440 W to 4214 W

the porosity of the longitudinal track decreases from about 1.5% to about 0.02%. When the scanning speed varies in the range of 500 mm/min to 5000 mm/min

the range of track porosity is approx. 0.07% to 0.18%. Moreover

when the powder mass flow increases from 0.64 kg/h to 6.48 kg/h

the porosity increases from approx. 0.01% to 0.84%. It is shown that in high deposition-rate LMD

the scanning speed has no obvious influence on the porosity; and increasing laser power and reducing powder mass flow rate significantly reduce material porosity and increase the consistency of cross-sectional porosity.

关键词

Keywords

references

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