{"title":"Effects of Temperature and Microstructure on Short Crack Growth of Laser Powder Bed Fusion Ni-Based Superalloy","authors":"Feng Zhang, Yonghua Li, Tao Shi, Zibiao Wang, Wenqi Liu, Qiang Fu, Changbo Wu, Guian Qian","doi":"10.1111/ffe.14582","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>This paper utilized an in-situ electron microscopy technique along with high-temperature fatigue tests conducted at 298, 573, and 923 K to observe the initiation and propagation of short fatigue cracks (SFC) in the nickel-based superalloy GH4169 and to examine changes in grain boundaries. The study examined how temperature and local microstructure affect the growth behavior of SFC in GH4169, which was fabricated using laser powder bed fusion (LPBF). The growth rate of SFC increased with higher temperature and stress amplitude, while the GH4169 alloy exhibited a combination of intergranular and transgranular fractures. Using the modified Paris model, the SFC growth model with Young's modulus (<i>E</i>) as an independent variable successfully predicted the crack propagation rate under various temperature loading conditions.</p>\n </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"48 4","pages":"1866-1878"},"PeriodicalIF":3.1000,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fatigue & Fracture of Engineering Materials & Structures","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/ffe.14582","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
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Abstract
This paper utilized an in-situ electron microscopy technique along with high-temperature fatigue tests conducted at 298, 573, and 923 K to observe the initiation and propagation of short fatigue cracks (SFC) in the nickel-based superalloy GH4169 and to examine changes in grain boundaries. The study examined how temperature and local microstructure affect the growth behavior of SFC in GH4169, which was fabricated using laser powder bed fusion (LPBF). The growth rate of SFC increased with higher temperature and stress amplitude, while the GH4169 alloy exhibited a combination of intergranular and transgranular fractures. Using the modified Paris model, the SFC growth model with Young's modulus (E) as an independent variable successfully predicted the crack propagation rate under various temperature loading conditions.
期刊介绍：
Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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