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Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3, Pages 369-376 doi: 10.1007/s11465-018-0489-7

Abstract: This study aims to examine the crack growth behavior of turbine disc GH4169 superalloy under creep-fatigueThe crack growth rate of GH4169 superalloy significantly increased with dwell time.

Keywords： crack growth rate creep-fatigue GH4169 superalloy CT specimen dwell time

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Effects of parenteral nutrition with and without GH on the GH/IGF-1 axis after hepatectomy in hepatocellular

CAO Jie, LUO Shimin, LIANG Lijian, LAI Jiaming, CHEN Shanming

Frontiers of Medicine 2007, Volume 1, Issue 3, Pages 287-293 doi: 10.1007/s11684-007-0055-x

Abstract: Complex alterations in the GH/IGF-1 axis are thought to play an important role in the protein catabolismthis study was to explore the effects of parenteral nutrition (PN) with and without growth hormone (GH) on the GH/IGF-1 axis after hepatectomy for hepatocellular carcinoma (HCC) with cirrhosis and evaluatethe potential roles of recombinant human GH (rhGH) therapy.These data indicate that rhGH+PN could ameliorate the changes in the GH/IGF-1 axis after hepatectomy

Keywords： control function production surgical Complex

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LCF behavior and life prediction method of a single crystal nickel-based superalloy at high temperature

Zhihua ZHANG,Huichen YU,Chengli DONG

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4, Pages 418-423 doi: 10.1007/s11465-015-0362-x

Abstract:

Low cycle fatigue tests were conducted on the single crystal nickel-based superalloy, DD6, with different

Keywords： life prediction single crystal superalloy low cycle fatigue (LCF) crystallographic orientation strain

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Recent Advances in Physical Optics Research

Huang Zhixun

Strategic Study of CAE 2006, Volume 8, Issue 2, Pages 18-29

Abstract:

This paper focuses on a series of theoretical and experimental studies of the physical optics, such as the Goos-Hänchen shift, the FTIR phenomena, the negative refraction index, the superluminal experiments of THz rays, and the measurement of photon rest mass. It indicates that the evanescent waves phenomena are becoming more important in physical optics research recently. For example, superluminal propagation is a result of the evanescent waves, i. e. the evanescent fields. The possibility of a finite photon rest mass remains one of the most important issues in physical optics, as it has a bearing on a series of fundamental questions. A discussion on the present situation in this area is given. Finally, the history and advances of optical frequency standard and optical frequency measurements are given in the article.

Keywords： physical optics negative wave velocity negative refraction index GH shift evanescent waves photon rest

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Grindability of high-temperature alloy with ceramic alumina wheels

ZHANG Hongxia, CHEN Wuyi, CHEN Zhitong

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 2, Pages 139-145 doi: 10.1007/s11465-008-0040-3

Abstract: velocity of the wheel is 18–22 m/s and the depth of grinding should not exceed 0.02 mm in grinding GH2132than that of the base material, which deteriorates the mechanical properties and heat resistance of GH2132

Keywords： metallographic topography grinding GH2132 resistance decrease

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Novel casting processes for single-crystal turbine blades of superalloys

Dexin MA

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1, Pages 3-16 doi: 10.1007/s11465-018-0475-0

Abstract: the establishment of a high temperature gradient for SC growth and the freckle-free solidification of superalloy

Keywords： superalloy investment casting Bridgman process directional solidification single crystal turbine blade

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A New Method for Strengthening Wrought Superalloys: micro-alloying with Phosphorus and Boron

Hu Zhuangqi,Sun Wenru,Song Hongwei

Strategic Study of CAE 2005, Volume 7, Issue 3, Pages 17-26

Abstract:

The strengthening effect of phosphorus and boron on wrought superalloys is reviewed and discussed. The addition of phosphorus and boron can prolong the rupture life of some wrought superalloys over 3 times, and lowers the constant creep rate by an order of magnitude. By micro-alloying with phosphorus and boron, alloys with extended rupture life are developed, the service temperature of IN718 alloy is enhanced, and the alloys which can be used for a long time at 700℃ with higher combined properties can be developed.

Keywords： wrought superalloy phosphorus boron micro-alloying

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Original position statistic distribution analysis characterization of niobium on the vertical section of casting of superalloypneumatic plate wheel

Wang Haizhou,Li Meiling,Zhuang Jingyun

Strategic Study of CAE 2011, Volume 13, Issue 10, Pages 19-27

Abstract:

The distribution of niobium on the vertical section of casting of GH169superalloy pneumatic plate wheel was studied by original position statistic distribution analysis techniquedetermine the homogeneity and statistic fitting degree of niobium in the vertical section of casting of GH169superalloy pneumatic plate wheel accurately for quality control.

Keywords： original position statistic distribution analysis superalloy pneumatic plate wheel niobium statistic

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Introduction of a New Method for Regulating Laves Phases in Inconel 718 Superalloy during a Laser-Repairing Article

Shang Sui,Haosheng Li,Zuo Li,Xuan Zhao,Liang Ma,Jing Chen

Engineering 2022, Volume 16, Issue 9, Pages 239-246 doi: 10.1016/j.eng.2021.08.030

Abstract: phases have important influences on the mechanical properties of laser-repaired Inconel 718 (IN718) superalloyto the deterioration of the substrate zone, the Laves phase in the laser cladding zone of IN718 superalloyproposed to regulate the morphology and size of the Laves phase in the laser cladding zone of IN718 superalloy

Keywords： Laser repair In situ laser heat treatment Inconel 718 alloy Laves phase

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Data-Driven Microstructure and Microhardness Design in Additive Manufacturing Using a Self-Organizing Map Article

Zhengtao Gan, Hengyang Li, Sarah J. Wolff, Jennifer L. Bennett, Gregory Hyatt, Gregory J. Wagner, Jian Cao, Wing Kam Liu

Engineering 2019, Volume 5, Issue 4, Pages 730-735 doi: 10.1016/j.eng.2019.03.014

Abstract:

To design microstructure and microhardness in the additive manufacturing (AM) of nickel (Ni)-based superalloys, the present work develops a novel data-driven approach that combines physics-based models, experimental measurements, and a data-mining method. The simulation is based on a computational thermal-fluid dynamics (CtFD) model, which can obtain thermal behavior, solidification parameters such as cooling rate, and the dilution of solidified clad. Based on the computed thermal information, dendrite arm spacing and microhardness are estimated using well-tested mechanistic models. Experimental microstructure and microhardness are determined and compared with the simulated values for validation. To visualize process–structure–properties (PSP) linkages, the simulation and experimental datasets are input to a data-mining model—a self-organizing map (SOM). The design windows of the process parameters under multiple objectives can be obtained from the visualized maps. The proposed approaches can be utilized in AM and other data-intensive processes. Data-driven linkages between process, structure, and properties have the potential to benefit online process monitoring control in order to derive an ideal microstructure and mechanical properties.

Keywords： Data science Multiphysics modeling Self-organizing map Microstructure Microhardness Ni-based superalloy