In-situ SEM investigation of fatigue crack propagation through cross-weld area in WAAM low-carbon steel and the role of microstructures in propagation behavior

IF 5.7 2区 材料科学 Q1 ENGINEERING, MECHANICAL
Jingjing He, Mengyu Cao, Xiaoyi Li, Xinyan Wang, Xiaoming Wang, Xuefei Guan
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引用次数: 0

Abstract

In-situ SEM fatigue testing is performed to investigate crack propagation through the heat affected zone as well as in the base material and deposited material in a wire and arc additive manufacturing (WAAM) low-carbon steel part. The slip band formation and development prior to crack initiation and the crack growth rate are monitored in-situ and compared using fatigue testing specimens sampled from the base material, heat affected zone, WAAM zone, and cross-weld zone. Results show that the cross-weld zone specimen has the lowest crack growth rate, followed by the heat affected zone specimen and the two base material specimens. The effect of banded pearlite, acicular ferrite, and grain boundary and orientation is discussed with the aid of optical metallographic images, SEM, and EBSD maps. The mechanisms of the lowest rate observed in the cross-weld zone specimen are the pearlite bands preventing slip transfer, the high angle grain boundary of ultra-fine acicular ferrite hindering the crack propagation, as well as the basketweave structure promoting a zigzag growth path.
原位扫描电子显微镜研究 WAAM 低碳钢疲劳裂纹在横焊区的扩展以及微观结构在扩展行为中的作用
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来源期刊
International Journal of Fatigue
International Journal of Fatigue 工程技术-材料科学:综合
CiteScore
10.70
自引率
21.70%
发文量
619
审稿时长
58 days
期刊介绍: Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.
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