Fatigue crack growth behavior in a harmonic structure designed austenitic stainless steel

Zhou, Gaobin; Ma, Hantuo; Zhu, Zhe; Sun, Jing; Wang, Xiaobin; Zeng, Peng; Zheng, Ruixiao; Chen, Xu; Ameyama, Kei

doi:10.1016/j.msea.2019.05.008

Cited by 23 publications

(9 citation statements)

References 53 publications

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“…Based on our prior work [39,40,41,42,43,44,45], a disk-shaped compact (DC(T)) sample type was employed in this work, similar to the specimen type referred to in the E399-17 ASTM standard. The composite was machined to produce specimens of this type having the sizes presented in Figure 1, after which the surfaces were polished to a mirror finish using emery papers (#80–#4000) followed by a suspension of SiO 2 .…”

Section: Methodsmentioning

confidence: 99%

Effect of TiB Orientation on Near-Threshold Fatigue Crack Propagation in TiB-Reinforced Ti-3Al-2.5V Matrix Composites Treated with Heat Extrusion

et al. 2019

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TiB-reinforced Ti-3Al-2.5V matrix composites, in which TiB whiskers are oriented parallel to the direction of heat extrusion, were fabricated via mechanical alloying and hot isostatic pressing (HIP). To investigate the near-threshold fatigue crack propagation in TiB-reinforced Ti-3Al-2.5V matrix composites, stress intensity factor K-decreasing tests were conducted for disk-shaped compact specimens having two different orientations of TiB whiskers at force ratios from 0.1 to 0.8 under ambient conditions. The crack growth rates, da/dN, for the composites incorporating TiB whiskers oriented perpendicular to the direction of crack growth were constantly lower than those obtained in the case where the orientation was parallel at the same stress intensity range ΔK, while the threshold stress intensity range, ΔKth, was higher. This effect can be explained by the increase in the degree of roughness-induced crack closure resulting from the perpendicular TiB, because fatigue cracks preferentially propagated across the boundaries between the matrix and the TiB in certain regions. In contrast, the effective threshold stress intensity range, ΔKeff,th, for composites was unaffected by the TiB orientation at low force ratios.

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Section: Methodsmentioning

confidence: 99%

Effect of TiB Orientation on Near-Threshold Fatigue Crack Propagation in TiB-Reinforced Ti-3Al-2.5V Matrix Composites Treated with Heat Extrusion

et al. 2019

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“…They studied various materials, like copper [4], Co-Cr-Mo [5,6], Ni [7], stainless steel [8,9] and titanium and its alloys [2,10,11], with successful obtaining of the harmonic structure in bulk (sintered) materials. Some papers were devoted to fatigue behavior of HS [12,13], influence of thermomechanical treatment [14] or possibility of obtaining HS in high entropy alloys [15]. In the present work the attempt has been made to create harmonic structure in the powders and compacts of austenitic AISI 308L steel.…”

Section: Introductionmentioning

confidence: 98%

Evaluation of Harmonic Structure Obtained in Mechanically Milled Powders and Pulse Plasma Sintered Compacts of Austenitic Steel

Oleszak

Sadurska

Cieślak

2021

Metals

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The paper describes an attempt to obtain harmonic structure (HS) in AISI308L steel. Harmonic structure is the term related to the microstructure fabricated by mechanical milling of metallic powders under soft milling conditions, resulting in the formation of plastically deformed, grain-refined shell and unchanged core. This microstructure can be preserved after successful powder compaction. The powders of AISI308L steel were milled under soft condition up to 50 h and then compacted by pulse plasma sintering at 900–1100 °C. For powders and compacts XRD, SEM and hardness measurements were applied as characterization techniques. The milling process resulted in austenite transformation into nanocrystalline ferrite and formation of grain refined outer layer. The applied pulse plasma sintering parameters allowed preservation of this microstructure and manufacturing of compacts with homogeneous distribution of elements, relative density above 95% and hardness in the range 167–185 HV, depending on sintering temperature. Simultaneously, the starting phase composition was restored, i.e., austenite with 12% contribution of ferrite. The crystallite size of austenite was about 20 nm and was significantly smaller then in starting powders.

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“…Therefore, the harmonic-structured 316L steels had higher fatigue-crack growth rates and a lower threshold stress intensity factor range for crack growth (∆K th ) compared to the homogeneous CG SUS316L steels. Fatigue cracks tended to propagate along UFG network structure in harmonic-structured SUS316L steels [25,26].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the steels with hierarchical and laminated grains and twins also induced a friction stress that acted on the crack surface and decelerated fatigue-crack opening and growth [15]. The high-cycle fatigue properties and fatigue-crack growth behavior of harmonic-structured SUS316L steels have been investigated [24,25]. Fatigue limits of the harmonic-structure SUS316L steels were higher than that of the CG SUS316L steels, which was related to the enhanced tensile strength [24].…”

Section: Introductionmentioning

confidence: 99%

Ratcheting-Fatigue Behavior of Harmonic-Structure-Designed SUS316L Stainless Steel

Yang

Zhang

et al. 2021

Metals

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Stainless steels with harmonic-structure design have a great balance of high strength and high ductility. Therefore, it is imperative to investigate their fatigue properties for engineering applications. In the present work, the harmonic-structured SUS316L stainless steels were fabricated by mechanical milling (MM) and subsequent hot isostatic pressing (HIP) process. A series of ratcheting-fatigue tests were performed on the harmonic-structured SUS316L steels under stress-control mode at room temperature. Effects of grain structure and stress-loading conditions on ratcheting behavior and fatigue life were investigated. Results showed that grain size and applied mean stress had a significant influence on ratcheting-strain accumulation and fatigue life. Owing to the ultrafine grained structure, tensile strength of the harmonic-structured SUS316L steels could be enhanced, which restrained the ratcheting-strain accumulation, resulting in a prolonged fatigue life. A higher mean stress caused a faster ratcheting-strain accumulation, which led to the deterioration of fatigue life. Moreover, a modified model based on Smith–Watson–Topper (SWT) criterion predicted the ratcheting-fatigue life of the harmonic-structured SUS316L steels well. Most of the fatigue-life points were located in the 5 times error band.

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Fatigue crack growth behavior in a harmonic structure designed austenitic stainless steel

Cited by 23 publications

References 53 publications

Effect of TiB Orientation on Near-Threshold Fatigue Crack Propagation in TiB-Reinforced Ti-3Al-2.5V Matrix Composites Treated with Heat Extrusion

Effect of TiB Orientation on Near-Threshold Fatigue Crack Propagation in TiB-Reinforced Ti-3Al-2.5V Matrix Composites Treated with Heat Extrusion

Evaluation of Harmonic Structure Obtained in Mechanically Milled Powders and Pulse Plasma Sintered Compacts of Austenitic Steel

Ratcheting-Fatigue Behavior of Harmonic-Structure-Designed SUS316L Stainless Steel

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