Temperature Dependence on Cracking Behavior in Thermomechanical Fatigue of Nickel-Based Single-Crystal Superalloy

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-02-15 DOI:10.1007/s12540-024-01887-3

Van Hung Dao, Hee Soo Yun, Sang Koo Jeon, Jaeyeong Park, Seung Hoon Nahm

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Abstract

The fatigue behavior of a second-generation single-crystal nickel-based superalloy was examined under thermomechanical fatigue (TMF) at temperatures ranging from 450 to 850 °C, using strain-controlled conditions. The study aimed to analyze cyclic deformation behavior, investigate dominant damage mechanisms, and assess cracking behavior in both in-phase (IP) and out-of-phase (OP) tests. Under IP TMF conditions, the primary damage manifestation was primarily attributed to creep-fatigue interactions, collectively leading to a reduced lifetime. Conversely, in the OP tests, the damage predominantly stemmed from the oxidation-fatigue mechanisms occurring at high mechanical strains. Creep-induced damage emerges as an additional factor at lower mechanical strains, rendering the material more susceptible to crack propagation. Consequently, the fatigue life exhibited considerable reduction and tended to reverse compared to the IP case. Further tests were conducted across various maximum temperature cycling ranges of 950 and 1038 °C to explore the effect of temperature on IP TMF lifespans. Increased mobility of dislocations and oxidation penetration were found to further reduce the fatigue life of ruptured specimens, with this effect believed to be proportional to the temperature variation in the IP TMF test. The microstructures and damage evolution were examined to provide insights into the changes in fatigue life.

Graphic Abstract

Abstract Image

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镍基单晶高温合金热疲劳开裂行为的温度依赖性

在应变控制条件下，研究了第二代镍基单晶高温合金在450 ~ 850℃的热机械疲劳（TMF）条件下的疲劳行为。该研究旨在分析循环变形行为，研究主要损伤机制，并评估相内（IP）和相外（OP）试验中的开裂行为。在IP TMF条件下，主要的损伤表现主要归因于蠕变-疲劳相互作用，共同导致寿命缩短。相反，在OP试验中，损伤主要源于在高机械应变下发生的氧化疲劳机制。在较低的机械应变下，蠕变引起的损伤作为一个附加因素出现，使材料更容易受到裂纹扩展的影响。因此，与IP情况相比，疲劳寿命表现出相当大的降低，并且趋于逆转。进一步的测试在950°C和1038°C的不同最高温度循环范围内进行，以探索温度对IP TMF寿命的影响。位错迁移率和氧化渗透的增加进一步降低了断裂试样的疲劳寿命，这种影响被认为与IP TMF测试中的温度变化成正比。研究了合金的显微组织和损伤演变，为研究疲劳寿命的变化提供了新的思路。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.