Effect of Wall Thickness and Surface Conditions on Creep Behavior of a Single-Crystal Ni-Based Superalloy

被引：6
|
作者：
Korber, Selina [1 ]
Wolff-Goodrich, Silas [2 ]
Voelkl, Rainer [1 ]
Glatzel, Uwe [1 ]
机构：
[1] Univ Bayreuth, Met & Alloys, Prof Rudiger Bormann Str 1, D-95447 Bayreuth, Germany
[2] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany
来源：
METALS | 2022年 / 12卷 / 07期
关键词：
creep; thin-walled; casting surface; single crystal; MAR M247LC; HIGH-TEMPERATURE CREEP; THIN-SECTION SIZE;
D O I：
10.3390/met12071081
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of wall thickness and specimen surface on the creep behavior of the single-crystal nickel-based superalloy MAR M247LC is studied. Specimens with wall thicknesses of 0.4, 0.8, 1 and 2 mm, with and without casting surface, are compared to specimens of the same wall thickness prepared from bulk material. Creep behavior turned out to be independent from surface conditions even for the thinnest specimens. The thickness debit effect is not pronounced for short creep rupture times (<= 100 h at 980 degrees C), whereas it is significant for creep rupture times longer than similar to 200 h at 980 degrees C. The thickness debit effect is time-dependent and caused by oxidation and diffusion-controlled mechanisms.
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页数：11
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