Characterization of Pearlite Morphology and Associated Micro-Cracks in EN9 Grade Carbon Steel by Atomic Force Microscopy

2012 ◽  
Vol 585 ◽  
pp. 67-71 ◽  
Author(s):  
K. Chandra Sekhar ◽  
B.P. Kashyap ◽  
Sandeep Sangal
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Tensile Strength ◽  
Microstructural Characterization ◽  
Microstructural Properties ◽  
Force Microscopy ◽  
Atomic Force ◽  
Micro Cracks ◽  
Matrix Properties

Micro and Nano Features of Microstructural Properties along with Micro-Cracks and Voids, which Severely Affect the Strength and Toughness of the Material, Were Studied in Commercial EN9 Steel Round Product by Using Atomic Force Microscopy (AFM). this Has Overcome the Limitations of Optical and Scanning Microscopy. the Aim of the Present Work Is to Characterize the Pearlite Matrix Properties for Nanoscale Results as Pearlitic Morphology and Lamellae Play a Significant Role in Influencing the Mechanical Properties. it Is Also Shown that the Atomic Force Microscope Is a 3D Characterizing Tool which Can Facilitate Visualizing the Adjacent Corners in Alternate Layers of Ferrite-Cementite Lamellae. it Is Also Noted that the Micro-Sized Cracks Exist at the Weak Interfaces between the Ferrite and Cementite Lamellae, which Would Limit the Work Hardening Property of Pearlite and Thus Reduce the Ultimate Tensile Strength Significantly. in Addition, Phase Transformation from γ-Phase to Pearlite Was Schematically Predicted and Discussed as Evident from Microstructural Characterization.

scholarly journals Influence of hematite nanorods on the mechanical properties of epoxy resin

2017 ◽  
Vol 82 (4) ◽  
pp. 437-447 ◽  
Author(s):  
Gordana Bogdanovic ◽  
Tijana Kovac ◽  
Enis Dzunuzovic ◽  
Milena Spírková ◽  
Phillip Ahrenkiel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Microstructural Characterization ◽  
Uniform Size ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Uniform Size Distribution ◽  
Tensile Toughness

The mechanical properties of nanocomposites obtained by incorporation of fairly uniform hematite nanorods (?-Fe2O3 NRs) into epoxy resin were studied as a function of the content of the inorganic phase. A thorough microstructural characterization of the ?-Fe2O3 NRs and the nanocomposites was performed using transmission electron microscopy (TEM) and atomic force microscopy (AFM). The TEM measurements revealed rod-like morphology of the nanofiller with a uniform size distribution (8.5 nm?170 nm, diameter?length). High-magnification TEM and AFM measurements indicated agglomeration of ?-Fe2O3 NRs embedded in the epoxy resin. Stress at break, strain at break, elastic modulus and tensile toughness of the nanocomposites were compared with the data obtained for pure epoxy resin. Significant influence of nanofiller on the mechanical properties of epoxy resin, as well as on the glass transition temperature, could be noticed for samples with low contents of the inorganic phase (up to 1 wt. %).

Microstructure and Mechanical Properties of Oxide Eutectic Fibers

1999 ◽  
Vol 581 ◽  
Author(s):  
S. D. Durbin ◽  
A. Yoshikawa ◽  
K. Hasegawa ◽  
J.-H. Lee ◽  
B. M. Epelbaum ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Tensile Strength ◽  
Surface Characteristics ◽  
Characteristic Size ◽  
Chinese Script ◽  
Force Microscopy ◽  
Atomic Force ◽  
Uniform Microstructure ◽  
Eutectic Materials

ABSTRACTSome oxide eutectic materials, such as sapphire/YAG, display an intricate “Chinese script” microstructure which strongly influences properties such as mechanical strength. We used the micro pulling-down technique to grow fibers of a series of such materials at rates over 20 mm/min, giving a uniform microstructure with a characteristic size as low as 150 nm. Bulk and surface characteristics of this microstructure were investigated by electron and atomic force microscopy. Smaller microstructure size gave higher tensile strength at 1500°C. Annealing of the fibers produced some coarsening of the microstructure, but increased the strength at lower temperatures.

Visco-hyperelastic characterization of the mechanical properties of human fallopian tube tissue using atomic force microscopy

Materialia ◽  
2021 ◽  
Vol 16 ◽  
pp. 101074
Author(s):  
Fereshteh Jafarbeglou ◽  
Mohammad Ali Nazari ◽  
Fatemeh Keikha ◽  
Saeid Amanpour ◽  
Mojtaba Azadi
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Fallopian Tube ◽  
Force Microscopy ◽  
Human Fallopian Tube ◽  
Atomic Force

Investigating the Mechanical Properties of Biological Brain Cells With Atomic Force Microscopy

2018 ◽  
Vol 12 (4) ◽  
Author(s):  
Tariq Mohana Bahwini ◽  
Yongmin Zhong ◽  
Chengfan Gu ◽  
Zeyad Nasa ◽  
Denny Oetomo
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Cancer Cells ◽  
Force Microscopy ◽  
Indentation Force ◽  
Young’S Moduli ◽  
Atomic Force ◽  
Fitting Algorithm ◽  
Cell Mechanical Properties

Characterization of cell mechanical properties plays an important role in disease diagnoses and treatments. This paper uses advanced atomic force microscopy (AFM) to measure the geometrical and mechanical properties of two different human brain normal HNC-2 and cancer U87 MG cells. Based on experimental measurement, it measures the cell deformation and indentation force to characterize cell mechanical properties. A fitting algorithm is developed to generate the force-loading curves from experimental data. An inverse Hertzian method is also established to identify Young's moduli for HNC-2 and U87 MG cells. The results demonstrate that Young's modulus of cancer cells is different from that of normal cells, which can help us to differentiate normal and cancer cells from the biomechanical viewpoint.

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