High-cycle fatigue behavior of IN 738LC superalloy at high temperatures

被引：1

作者：

Hornik, Vit ^{[1
,2
]}

Baca, Adrian ^{[1
]}

Smid, Miroslav ^{[1
]}

Hrbacek, Karel ^{[3
]}

Hutar, Pavel ^{[1
,2
]}

机构：

[1] AS CR, Inst Phys Mat, Zizkova 22, Brno 61662, Czech Republic

[2] CEITEC IPM, Zizkova 22, Brno 61662, Czech Republic

[3] PBS Velka Bites AS, Vlkovska 279, Velka Bites 59512, Czech Republic

来源：

10TH INTERNATIONAL CONFERENCE ON MATERIALS STRUCTURE AND MICROMECHANICS OF FRACTURE, MSMF | 2023年 / 43卷

关键词：

high-cycle fatigue; superalloy; high-temperatures; IN; 738LC; fractography;

D O I：

10.1016/j.prostr.2022.12.248

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The presented study is focused on experimental results of high-cycle fatigue life of a cast polycrystalline nickel-based superalloy IN 738LC at temperatures of 800, 900, and 950 degrees C. The absence of hot isostatic pressing (HIP) led to the occurrence of casting defects in the microstructure. The fatigue tests were performed in symmetrical loading in laboratory air. The fracture surfaces of specimens were studied by scanning electron microscopy to describe the influence of temperature on the fatigue damage mechanism and fatigue crack initiation. Change in the primary crack propagation mechanism from crystalline (stage I regime) to non-crystalline (stage II regime) mechanism was observed with increasing temperature. However, the effect of changing mechanism caused by temperature dependence was unfavorably influenced by casting defects. (c) 2023 The Authors. Published by Elsevier B.V.

引用

页码：136 / 141

页数：6

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