Laser melting deposition of a porosity-free alloy steel by application of high oxygen-containing powders mixed with Cr particles

被引：13
作者：
Kang, Hongwei [1 ]
Dong, Zhihong [2 ]
Zhang, Wei [1 ]
Xie, Yujiang [2 ]
Peng, Xiao [3 ]
机构：
[1] Univ Sci & Technol China, Coll Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Shenyang 110016, Liaoning, Peoples R China
[3] Nanchang Hangkong Univ, Sch Mat Sci & Engn, 696 Fenghenan Ave, Nanchang 330063, Jiangxi, Peoples R China
来源：
VACUUM | 2019年 / 159卷 / 319-323期
关键词：
Laser metal deposition; Alloy steels; Porosity; Microstructure; TEM; DIRECT METAL-DEPOSITION; MECHANICAL-PROPERTIES; MICROSTRUCTURE; COMPONENTS;
D O I：
10.1016/j.vacuum.2018.10.059
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Laser melting deposition (LMD) of an alloy steel by application of commercial 12CrNi2 powder with 0 content as high as 0.53 wt% has been investigated. It shows that the LMD alloy steel contains micron-sized pores. The pore formation, which is assumed to result from gas bubbles due to the reaction of carbon and oxygen in the laser molten pool, can be prevented by mixing the alloy steel powder with an appropriate amount of Cr particles. The result is interpreted based on reaction thermodynamics in the molten pool in combination with TEM observation of the microstructure of the LMDed alloy steel.
引用
收藏
页码：319 / 323
页数：5
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