Microsegregation and Secondary Phase Formation During Directional Solidification of the Single-Crystal Ni-Based Superalloy LEK94

被引：13

作者：

Lopez-Galilea, Inmaculada ^{[1
,2
]}

Huth, Stephan ^{[1
]}

Fries, Suzana G. ^{[3
]}

Warnken, Nils ^{[4
]}

Steinbach, Ingo ^{[3
]}

Theisen, Werner ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Lehrstuhl Werkstofftech, D-44780 Bochum, Germany

[2] Ruhr Univ Bochum, Res Dept HTM IS3, D-44780 Bochum, Germany

[3] Ruhr Univ Bochum, STKS, D-44780 Bochum, Germany

[4] Univ Birmingham, Birmingham B15 2TT, W Midlands, England

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2012年 / 43A卷 / 13期

关键词：

Differential thermal analysis - Nickel alloys - Segregation (metallography) - Single crystals - Superalloys;

D O I：

10.1007/s11661-012-1327-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A multicomponent phase-field method coupled to thermodynamic calculations according to the CALPHAD method was used to simulate microstructural evolution during directional solidification of the LEK94 commercial single-crystal Ni-based superalloy using a two-dimensional unit cell approximation. We demonstrate quantitative agreement of calculated microsegregation profiles and profiles determined from casting experiments as well as calculated fraction solid curves with those determined in differential thermal analysis (DTA) measurements. Finally, the role of solidification rate on dendrite morphology and precipitation of the secondary phases is investigated and a new measure of the dendrite morphology is presented to quantify the effect of back diffusion on the amount of secondary phases.

引用

页码：5153 / 5164

页数：12