Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing

被引：90
作者：
Sanviemvongsak, Tom [1 ,2 ]
Monceau, Daniel [1 ]
Desgranges, Clara [2 ]
Macquaire, Bruno [2 ]
机构：
[1] Univ Toulouse, ENSIACET, CIRIMAT, CNRS,INPT, 4 Allee Emile Monso,BP 44362, F-31030 Toulouse 4, France
[2] Safran Paris Saclay, Safran Tech, Rue Jeunes Bois,CS 80112, F-78772 Magny Les Hameaux, France
来源：
CORROSION SCIENCE | 2020年 / 170卷
关键词：
Superalloys; Laser beam melting; Electron beam melting; Grain boundaries oxidation; Thermocalc; Diffusion; HIGH-TEMPERATURE OXIDATION; GRAIN-BOUNDARY-CHARACTER; ALUMINUM ALLOYS; NICKEL; DIFFUSION; BEHAVIOR; EMBRITTLEMENT; RESISTANCE; MECHANISM; CORROSION;
D O I：
10.1016/j.corsci.2020.108684
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The intergranular oxidation in air at 850 degrees C of alloy 718 produced by laser beam melting and electron beam melting was compared to that of the wrought alloy. Quantitative analyses revealed that the amount of grain boundary oxidation was similar for these alloys. However, the additively manufactured ones presented deeper and thicker oxides at grain boundaries, due to grain size heterogeneity and to a smaller number of special boundaries. Results show that intergranular oxidation kinetics follows Wagner's theory on internal oxidation considering not only O diffusion at the intergranular oxide/metal interfaces but also Al and Ti diffusion in the bulk.
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页数：15
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