Comparative tensile behavior of freestanding γ-γ′ and β-(Ni,Pt)Al bond coats and effect on tensile properties of coated superalloy

被引：15

作者：

Alam, Md Zafir ^{[1
]}

Parlikar, C. ^{[1
]}

Chatterjee, D. ^{[1
]}

Das, Dipak K. ^{[1
]}

机构：

[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

来源：

MATERIALS & DESIGN | 2017年 / 114卷

关键词：

gamma-gamma ' Coating; Pt-aluminide coating; Superalloy; Microtensile; Tensile; Fracture; THERMAL BARRIER COATINGS; NICKEL-BASE SUPERALLOYS; NI-BASED SUPERALLOY; OXIDATION BEHAVIOR; ALUMINIDE COATINGS; CYCLIC OXIDATION; HIGH-TEMPERATURE; DEGREES-C; MECHANISMS; CM-247LC;

D O I：

10.1016/j.matdes.2016.10.069

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The tensile behavior of freestanding 40 mu m thick gamma-gamma' and 50 mu m thick beta-(Ni,Pt)Al coatings was evaluated at room temperature (RT) and 870 degrees C by microtensile testing method. Simultaneously, the effect of coatings on the tensile properties of the directionally solidified (DS) CM-247LC superalloy was also examined. Both the freestanding coatings had lower strength than that of the superalloy and the yield as well as the ultimate tensile strength (YS and UTS) of the superalloy substrate was lowered by the application of either coating. At RT, the freestanding gamma-gamma' coating was significantly stronger (YS = 660 MPa) and ductile than that of the brittle beta-(Ni,Pt)Al coating which fractured at similar to 300 MPa with negligible ductility. Comparatively, the beta-(Ni,Pt)Al coating caused more deterioration in substrate tensile properties (especially ductility) than that of the gamma-gamma' coating at RT. On the contrary, at 870 degrees C, albeit their similar YS, the gamma-gamma' coating exhibited brittle intergranular fracture and limited ductility whereas the beta-(Ni,Pt)Al coating showed ductile failure. Numerous sharp cracks formed by the de-cohesion of the gamma and gamma' phase boundaries within the gamma-gamma' coating and their penetration into the substrate aggravated degradation in the substrate ductility than in case of the ductile beta-(Ni,Pt)Al coating. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：505 / 514

页数：10

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