Influence of dwell times on the thermomechanical fatigue behavior of a directionally solidified Ni-base superalloy

被引：32

作者：

Guth, Stefan ^{[1
]}

Petras, Roman ^{[2
]}

Skorik, Viktor ^{[2
]}

Kruml, Tomas ^{[2
]}

Man, Jiri ^{[2
]}

Lang, Karl-Heinz ^{[1
]}

Polak, Jaroslav ^{[2
]}

机构：

[1] Karlsruhe Inst Technol, Inst Appl Mat, D-76131 Karlsruhe, Germany

[2] Inst Phys Mat ASCR, Brno 61662, Czech Republic

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2015年 / 80卷

关键词：

Nickel base superalloy; Thermomechanical fatigue; Dwell time; Lifetime behavior; Damage mechanisms; LOW-CYCLE FATIGUE; THERMAL-MECHANICAL FATIGUE; CRACK-GROWTH-BEHAVIOR; TEMPERATURE-DEPENDENCE; YIELD-STRESS; PHASE-SHIFT; HOLD-TIME; ORIENTATION; STRAIN; CREEP;

D O I：

10.1016/j.ijfatigue.2015.07.005

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In-phase (IP) and out-of-phase (OP) thermomechanical fatigue tests with T = 100-750 degrees C and optional dwells of 20 min at 750 degrees C were carried out on directionally solidified Ni-base Alloy 247 LC DS. Introducing dwells reduced the lifetime for both phase angles to about one sixth. Specific damage mechanisms were internal carbide and carbide-matrix interface cracks in IP tests and crack propagation along {111}-microtwin planes in OP tests. Introducing dwells intensified both effects, thus contributing to the lifetime reduction. During dwells, the gauge length may exhibit transversal creep because of extensometer forces distorting the strain measurement. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：426 / 433

页数：8

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