The influence of primary carbides and test parameters on abrasive and erosive wear of selected PM high speed steels

1997 ◽  
Vol 30 (3) ◽  
pp. 183-191 ◽  
Author(s):  
F. Bergman ◽  
P. Hedenqvist ◽  
S. Hogmark
Keyword(s):  
High Speed ◽  
Erosive Wear ◽  
Test Parameters ◽  
Primary Carbides

Explosively Driven Expansion and Fragmentation Behavior for Cylinders, Spheres and Rings of 304 Stainless Steel

2010 ◽  
Vol 638-642 ◽  
pp. 1035-1040 ◽  
Author(s):  
Tetsuyuki Hiroe ◽  
Kazuhito Fujiwara ◽  
Hidehiro Hata ◽  
Mitsuru Yamauchi ◽  
Kiyotaka Tsutsumi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Speed ◽  
Fracture Behavior ◽  
Copper Wire ◽  
304 Stainless Steel ◽  
Fragmentation Model ◽  
Fragmentation Behavior ◽  
Deformation And Fracture ◽  
Test Parameters ◽  
Fine Copper

Explosive loading techniques are applied to expand tubular cylinders, spherical shells and rings of 304 stainless steel to fragmentation, and the effects of wall thicknesses, explosive driver diameters and the constant proportionality of the in-plane biaxial stretching rates are investigated on the deformation and fracture behavior of three basic structures experimentally and numerically. In the cylinder tests, the driver is a column of high explosive PETN, inserted coaxially into the bore of a cylinder and initiated by exploding a fine wire bundle at the column axis using a discharge current from a high-voltage capacitor bank. In case of the ring tests, ring specimens are placed onto a single cylinder filled with the PETN as a expansion driver, and for sphere tests, specimens filled with the PETN are also initiated by exploding a fine copper wire line with small length located at the central point. Two types of experiments are conducted for every specimen and test condition. The first type uses high speed cameras to observe the deformation and crack generation of expanding specimens showing the final maximum in-plane stretching rate of above , and the second uses soft capturing system recovering typically most fragments successfully. The fragments are measured and investigated using a fragmentation model. The effects of test parameters on the deformation and fracture behavior for three types of structures are discussed in need of modified fragmentation model for shell structural elements.

Infrared optical properties of pulsed laser deposited carbon films with the bonding and properties of diamond

1995 ◽  
Vol 10 (10) ◽  
pp. 2548-2554 ◽  
Author(s):  
F. Davanloo ◽  
J.H. You ◽  
C.B. Collins
Keyword(s):  
Optical Properties ◽  
High Speed ◽  
Erosive Wear ◽  
High Energy ◽  
Carbon Films ◽  
Optical Parameters ◽  
Free Carrier Absorption ◽  
Transmission Spectra ◽  
Carbon Ions ◽  
Optical Applications

Composed of packed nanophase nodules in which the carbon atoms are linked with the tetrahedral bonding of diamond, laser plasma films are deposited in vacuum onto almost any substrate by condensing carbon ions carrying keV energies. These multiply charged ions are obtained from the laser ablation of graphite at intensities in excess of 1011 W cm−2. The high energy of condensation provides both for the chemical bonding of such films to a wide variety of substrates and for low values of residual compressive stress. Coatings of 2–5 μm thicknesses have extended lifetimes of important optical materials against the erosive wear from high-speed particles and droplets by factors of tens to thousands. In this work, the optical properties of these films at infrared (IR) wavelengths were studied. Transmission spectra of several freestanding films on silicon frames were measured. Using a model considering rough surface scattering and free carrier absorption, satisfactory fits to these transmission spectra were obtained and from them the optical parameters were extracted. The characterization studies performed in this work indicated a great potential for the laser-deposited nanophase diamond films in optical applications.

The Computational Analysis of Hanging-Weight Method Used in High Speed Rail

2011 ◽  
Vol 291-294 ◽  
pp. 1773-1778
Author(s):  
Hao Yu Wang ◽  
Hong Xiao ◽  
Bo Wen Hou
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
Computational Analysis ◽  
Component Part ◽  
High Speed Rail ◽  
Deflection Measurement ◽  
Test Parameters ◽  
Weight Method ◽  
Deflection Test

This paper focuses on the feasibility of the hanging-weight method in bridge deflection test of high speed rail. Firstly, it explains principles and component part. And then it proposes steps to determine test parameters. Lastly, it demonstrates the feasibility and reliability of this method by numerical simulation. The result shows the hanging-weight method satisfies the precision of bridge deflection measurement in high speed rail.

Gigacycle Fatigue Response of PM versus Ingot Metallurgy Tool Steels

2011 ◽  
Vol 672 ◽  
pp. 23-30 ◽  
Author(s):  
Herbert Danninger ◽  
Christian Sohar ◽  
Christian Gierl Mayer ◽  
Agnieszka Betzwar-Kotas ◽  
Brigitte Weiss
Keyword(s):  
Tool Steel ◽  
High Speed ◽  
Cold Work ◽  
Ingot Metallurgy ◽  
Tool Steels ◽  
Endurance Strength ◽  
Steel Grades ◽  
Primary Carbides ◽  
Effect Of The Composition ◽  
Large Primary

In this work, the gigacycle fatigue response of several tool steel grades has been studied using an ultrasonic resonance testing device. It showed that both with ingot metallurgy (IM) and powder metallurgy (PM) tool steels, a true fatigue limit does not exist up to 10E10 cycles. PM steels resulted in significantly higher endurance strength levels than IM grades. However, there was virtually no effect of the composition and hardness of the materials, both for PM and IM grades cold work tool steels and high speed steels exhibiting virtually the same S-N curves. In the IM tool steel grades, crack initiation started at large primary carbides or carbide clusters, while in the PM grades, nonmetallic inclusions were the critical sites. In any case it is very important to avoid introducing residual stresses into the specimen surfaces during preparation, which would markedly shift the endurance strength levels.

scholarly journals Phase transformation refinement of coarse primary carbides in M2 high speed steel

2011 ◽  
Vol 21 (2) ◽  
pp. 180-186 ◽  
Author(s):  
Fu-sheng PAN ◽  
Wei-qing WANG ◽  
Ai-tao TANG ◽  
Li-zhi WU ◽  
Ting-ting LIU ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Speed ◽  
High Speed Steel ◽  
M2 High Speed Steel ◽  
Primary Carbides

The role of primary carbides in the wear of high speed steels

Wear ◽  
1986 ◽  
Vol 112 (3-4) ◽  
pp. 327-340 ◽  
Author(s):  
A.M. El-Rakayby ◽  
B. Mills
Keyword(s):  
High Speed ◽  
Primary Carbides

High-Speed Characterization of a Prototype Leaf Seal on an Advanced Seal Test Facility

2016 ◽  
Vol 138 (8) ◽  
Author(s):  
Michael J. Pekris ◽  
Adele Nasti ◽  
Ingo H. J. Jahn ◽  
Gervas Franceschini
Keyword(s):  
High Speed ◽  
Dynamic Control ◽  
Test Method ◽  
Test Facility ◽  
Operating Pressure ◽  
Labyrinth Seals ◽  
Engine Operation ◽  
Test Parameters ◽  
And Performance

Advanced contacting seals, such as leaf seals or brush seals, can offer reduced leakage during engine operation when compared to conventional labyrinth seals. The flexible elements of these seals provide better compliance with the rotor during flight maneuvers. The functionality and performance retention attributes of an engine-scale prototype leaf seal have been investigated on a seal test facility at Rolls-Royce that achieves engine-representative pressures and speeds and allows dynamic control of the seal position relative to the rotor, both concentric and eccentric. In this paper, the experimental setup and the test method are described in detail, including the quantification of the measurement uncertainty developed to ASME standard PTC 19.1. Experimental data are presented that show the variations in leakage and torque over typical variations of the test parameters. Insight is gained into the interactions between the operating pressure and speed and the concentric and eccentric movements imposed on the seal.

A New Low Alloy High Speed Power Hack Saw Blades

2005 ◽  
Vol 475-479 ◽  
pp. 3939-3942
Author(s):  
Yuan Gao ◽  
Jin Yong Xu ◽  
Yan Ping Liu ◽  
Zhi Yong He ◽  
Zhong Xu
Keyword(s):  
High Speed ◽  
Bulk Material ◽  
Low Cost ◽  
High Speed Steel ◽  
Low Alloy Steel ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Solid Diffusion ◽  
Primary Carbides ◽  
Plasma Surface Alloying

Plasma surface alloying for low alloy high speed power hack saw blades was introduced.The bulk material of the blade is made of low alloy steel, while the teeth of which possess a composition of high speed steel like as a result of surface modification by a plasma surface alloying process.It is a solid diffusion process eliminating method avoids the formation of coarse primary carbides which is a major problem encountered in the production of smelting high speed steel. As a result the carbides in the layer of high speed steel are fine and well-distributed.Therefore,it has not only well wear-resistance but also toughness. Besides, the blade also has the advantages of ease manufacturing and low cost.

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