scholarly journals Transmission Electron Microscopy of RSP Fe/Cr/Mn/Mo/C Alloy

1981 ◽  
Vol 8 ◽  
Author(s):  
J. J. Rayment ◽  
G. Thomas
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Rapid Solidification Processing ◽  
Duplex Microstructure ◽  
Solidification Processing ◽  
Transmission Electron ◽  
Martensitic Microstructure ◽  
Ferrite Grain Size

ABSTRACTRapid solidification processing (RSP) has been carried out on an Fe/Cr/Mn/Mo/C alloy using both electron-beam melting and piston-and-anvil techniques. Preliminary TEM results show RSP produces a refined duplex microstructure of ferrite and martensite, with a typical ferrite grain size of 0.50–3.0 microns. This RSP microstructure is significantly different from that observed in the conventionally austenitized and quenched alloys—a lath martensitic microstructure with thin films of retained interlath austenite. The morphological change produced by RSP is accompanied by an increase in hardness from 48Rc to 61Rc (^ 480 to 720 VHN). It is intended to use electron-beam specimens to examine the potential beneficial effect of RSP upon sliding wear resistance and, by careful TEM studies, it will be possible to characterize the microstructure and its role in the hardness and wear behavior of the RSP alloy.

Sliding Wear of WC-Ni-Based Self-Lubricating Composites With the Addition of Fullerene-Like WS2 Nanoparticles Against WC-Ni Cermet

2019 ◽  
Vol 142 (4) ◽  
Author(s):  
Bin Wu ◽  
Jin-hua Wang ◽  
Liang Zhong ◽  
Xin-yang Huang
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Friction Reduction ◽  
Low Temperature Sintering ◽  
Elemental Mapping ◽  
Cross Sectional ◽  
X Ray ◽  
Transmission Electron ◽  
Pulsed Electric Current ◽  
Self Lubricating Composites

Abstract In this work, WC-Ni-based composites with fullerene-like WS2 nanoparticles were fabricated by pulsed electric current sintering. High pressure could assist in low-temperature sintering of the composite. The sliding wear behavior of the composites against WC-Ni counterbodies was also studied in reciprocating ball-on-plate mode. The friction coefficient of the composite was reduced by the incorporated lubricant. Cross-sectional transmission electron microscopy and energy dispersive X-ray elemental mapping further suggest that the friction reduction is attributed to the formation of a mixed tribofilm on the wear tracks supported by the underlying densified matrix. Wear mechanisms are also discussed here.

The structure of rapidly solidified Fe-Ni-Mo-Co-B ribbons

1989 ◽  
Vol 47 ◽  
pp. 290-291
Author(s):  
D. M. Vanderwalker
Keyword(s):  
Electron Microscopy ◽  
Cell Walls ◽  
Lattice Parameter ◽  
Rapid Solidification Processing ◽  
Solidification Processing ◽  
Casting Technique ◽  
Transmission Electron ◽  
Structural Applications ◽  
Melt Spun ◽  
Rapidly Solidified

Fundamental aspects of solidification can be examined by experimentation in rapid solidification processing. The structure produced depends on parameters such as cooling rate, degree of undercooling, heat flow, and growth rate. Rapidly solidified iron base alloys are being developed for structural applications.RSR I Fe-19.7Mo-14.4Ni-7.3Co-1.9Bwt % and RSR II Fe-15.0Ni-11.1Mo-7.4Co-0.84B wt% ribbons were melt spun by a jet casting technique. RSR I ribbons were annealed for one hour at 816°C.Specimens were prepared for transmission electron microscopy by punching 3 mm discs from ribbons and electropolishing in a methanol 5% perchloric acid solution.The TEM was performed on the JEM 200CX electron microscope.As solidified RSR I was found to be canposed of fine (7nm) polycrystalline α-Fe. There is evidence for the presence of Ni Mo and FeB (Fig.1). On annealing, the α-Fe transforms to γ-Fe and FeB2Mo2, with significant grain growth (Fig.2). The as-solidified RSR II contains cellular γ-Fe with fcc-Fe2 3B6 of lattice parameter a=l.067nm at the cell walls (Fig. 3).

Rapidly Solidified Long Range Ordered Alloys

1981 ◽  
Vol 8 ◽  
Author(s):  
E. H. Lee ◽  
C. C. Koch ◽  
C. T. Liu
Keyword(s):  
Long Range ◽  
Cell Structure ◽  
Rapid Solidification Processing ◽  
Microstructural Feature ◽  
Solidification Processing ◽  
Transmission Electron ◽  
Ordered Alloys ◽  
Before And After ◽  
Rapidly Solidified ◽  
Carbide Particles

ABSTRACTThe influence of rapid solidification processing on the microstructure of long-range-ordered alloys in the (Fe,Co,Ni)3 V system has been studied by transmission electron microscopy. The main microstructural feature of the asquenched alloys was a fine cell structure (∼300 nm diameter) decorated with carbide particles. This structure was maintained after annealing treatments which develop the ordered crystal structure. Other features of the microstructures both before and after annealing are presented and discussed.

Sliding wear behavior of electron beam surface-melted 0–2 tool steel

Wear ◽  
1982 ◽  
Vol 75 (2) ◽  
pp. 285-301 ◽  
Author(s):  
A.W. Ruff ◽  
L.K. Ives
Keyword(s):  
Electron Beam ◽  
Tool Steel ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Beam Surface

An Overview of Dry Sliding Wear of Two-Phase FeNiMnAl Alloys

2012 ◽  
Vol 1516 ◽  
pp. 103-108 ◽  
Author(s):  
Xiaolan Wu ◽  
Fanling Meng ◽  
Ian Baker ◽  
Hong Wu ◽  
Paul R. Munroe
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Energy Dispersive Spectrometer ◽  
Scanning Transmission Electron Microscope ◽  
Dry Sliding Wear ◽  
Two Phase ◽  
Test Environment ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Pin On Disc

ABSTRACTThe pin-on-disc wear behavior of nanostructured two-phase Fe30Ni20Mn20Al30 and eutectic lamellar-structured Fe30Ni20Mn35Al15 is compared emphasizing the influence of the microstructure and mechanical properties of alloys as well as the effect of test environment. Although the wear of both alloys was greater in oxygen-containing environments, eutectic Fe30Ni20Mn35Al15 is less sensitive to oxygen than nanostructured Fe30Ni20Mn20Al30. Abrasive wear dominated during the wear in all cases, while plastic deformation also occurred during the wear of eutectic Fe30Ni20Mn35Al15. A tribolayer of zirconia, which was embedded in the surface of the wear pin, was characterized using a scanning transmission electron microscope equipped with an energy dispersive spectrometer.

Segregation and domain structure in rapidly solidified Ni3Al

1983 ◽  
Vol 41 ◽  
pp. 248-249
Author(s):  
J. A. Horton ◽  
C. C. Koch ◽  
C. T. Liu
Keyword(s):  
Solidification Rate ◽  
Domain Size ◽  
Microstructural Characterization ◽  
Rapid Solidification Processing ◽  
Solidification Processing ◽  
Antiphase Boundaries ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
Rapidly Solidified ◽  
Average Domain

Rapid solidification processing (RSP) in conjunction with microalloying is being used to enhance the ductility of Ni3Al. Boron which strengthens grain boundaries was added for significant improvement in ductility of Ni3Al. Specimens of Ni3Al (24 at. % Al) with additions of 0, 500, and 1000 wt ppm boron were splat-cooled in an arc-hammer apparatus. The specimens without boron were brittle while specimens with boron were ductile for all but the fastest quench rates. Microstructural characterization was performed with a Philips EM400T/FEG and JEM 120CX transmission electron microscopes.Antiphase boundaries (APB) are not observed in Ni3A1 alloys fabricated from cast ingots, but are present following RSP. The average domain sizes were 50 and 80 nm for specimens with and without boron, respectively, but were independent of solidification rate. Near the surface of the splats the domain size was approximately the same as in the center even though the grain size was much smaller. Regions of small domains which were always in the center of the grains were surrounded by larger domains.

scholarly journals Transmission Electron Microscopy of a CMSX-4 Ni-Base Superalloy Produced by Selective Electron Beam Melting

Metals ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 258 ◽  
Author(s):  
Alireza Parsa ◽  
Markus Ramsperger ◽  
Aleksander Kostka ◽  
Christoph Somsen ◽  
Carolin Körner ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Beam ◽  
Electron Beam Melting ◽  
Transmission Electron ◽  
Selective Electron Beam Melting ◽  
Base Superalloy

Comparison of wear behavior of GCr15 bearing steels prepared by laser selective melting (SLM) and electron beam melting (EBM)

2021 ◽  
pp. 130726
Author(s):  
Yunzhe Li ◽  
Shifeng Liu ◽  
Tong Xue ◽  
Yingkang Wei ◽  
Xin Yang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Wear Behavior ◽  
Bearing Steels

Techniques for Transmission Electron Microscopy of Fiber-Matrix Interfaces in Aluminum Alloy-Boron Composites by Ion Erosio

1971 ◽  
Vol 29 ◽  
pp. 204-205
Author(s):  
G. G. Shaw
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Aluminum Alloy ◽  
Electron Beam ◽  
Pure Aluminum ◽  
Ion Milling ◽  
Transmission Electron ◽  
Fiber Matrix ◽  
Ion Erosion ◽  
Row Of Fibers

The morphology and composition of the fiber-matrix interface can best be studied by transmission electron microscopy and electron diffraction. For some composites satisfactory samples can be prepared by electropolishing. For others such as aluminum alloy-boron composites ion erosion is necessary.When one wishes to examine a specimen with the electron beam perpendicular to the fiber, preparation is as follows: A 1/8 in. disk is cut from the sample with a cylindrical tool by spark machining. Thin slices, 5 mils thick, containing one row of fibers, are then, spark-machined from the disk. After spark machining, the slice is carefully polished with diamond paste until the row of fibers is exposed on each side, as shown in Figure 1.In the case where examination is desired with the electron beam parallel to the fiber, preparation is as follows: Experimental composites are usually 50 mils or less in thickness so an auxiliary holder is necessary during ion milling and for easy transfer to the electron microscope. This holder is pure aluminum sheet, 3 mils thick.

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