Preferential interdendritic oxidation of laser additively manufactured Inconel 718

被引：27
作者：
Luo, Guoyun [1 ]
Cheng, Manping [1 ]
Zhao, Longzhi [2 ]
Tang, Yanchuan [2 ]
Yao, Jianhua [3 ]
Cui, Hailong [4 ]
Song, Lijun [1 ,2 ]
机构：
[1] Hunan Univ, Hunan Prov Key Lab Intelligent Laser Mfg, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Peoples R China
[2] East China Jiaotong Univ, Sch Mat Sci & Engn, Nanchang 330013, Jiangxi, Peoples R China
[3] Zhejiang Univ Technol, Inst Laser Adv Mfg, Coll Mech Engn, 288 Liuhe Rd, Hangzhou 310023, Peoples R China
[4] China Acad Engn Phys, Inst Machinery Mfg Technol, Mianyang 621000, Sichuan, Peoples R China
来源：
CORROSION SCIENCE | 2021年 / 179卷
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Nickel alloys; Laser deposition; Interdendritic oxidation; Segregation; Carbides; NICKEL-BASE SUPERALLOY; HIGH-TEMPERATURES; HEAT-TREATMENT; NI; MICROSTRUCTURE; BEHAVIOR; CARBIDE; CR;
D O I：
10.1016/j.corsci.2020.109144
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Preferential interdendritic oxidation of as-built additively manufactured Inconel 718 is observed. Interdendritic depletion of Cr and enrichment of Ti are responsible for a slow formation of fine-grain Cr2O3 external scale that aids the establishment of a high-level oxygen partial pressure along the interdendrtic region. Incomplete oxidation of carbides results in a large volume expansion. Oxidation of Laves phases leads to a discontinuous NbO interlayer that facilitates countercurrent diffusion channels. Preferential interdendritic oxidation dramatically promotes oxidation kinetics of both transientand diffusion-controlled stages. Measures to homogenize the composition and to control the primary precipitates are desired to improve the oxidation performance.
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页数：6
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