Analysis of mechanochemical reaction in dual shot peening

2021 ◽  
pp. 1-19
Author(s):  
Ye Qi ◽  
Vinh Nguyen ◽  
Shreyes Melkote ◽  
Michael Varenberg
Keyword(s):  
Shot Peening ◽  
High Speed ◽  
Solid Mechanics ◽  
Iron Sulfide ◽  
Orthogonal Cutting ◽  
High Speed Steel ◽  
Local Maximum ◽  
Impact Angle ◽  
Mechanochemical Reaction ◽  
The Impact

Abstract Using a combination of solid mechanics and reaction kinetics models, this work simulates a mechanochemical reaction in dual shot peening with a mixture of Al2O3 and Cu2S particles used to form a tribologically beneficial iron sulfide layer on treated surfaces. The model predicts that the dissociation of the Fe-Fe and Cu-S bonds needed for the formation of Fe-S bonds accelerates monotonically with increase in the shot peening particle speed, whereas its rate reaches a local maximum at the impact angle of about 75 deg. The latter finding is validated by treating the rake faces of high-speed steel cutting tools and performing orthogonal cutting experiments in which the tools peened at the impact angle of 75 deg exhibit lower cutting and thrust forces than those peened at 40 deg. Additional peening parameters, namely, the particle volume ratio and the stage speed are found to be much less statistically significant under the conditions tested. The developed approach may be instrumental in guiding process optimization to improve the tribological performance of mechanochemically treated surfaces.

Effect of Spark Plasma Sintering on the Microstructure Evolution and Properties of M3:2 High-Speed Steel

2014 ◽  
Vol 788 ◽  
pp. 329-333
Author(s):  
Rui Zhou ◽  
Xiao Gang Diao ◽  
Jun Chen ◽  
Xiao Nan Du ◽  
Guo Ding Yuan ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
High Speed ◽  
Bending Strength ◽  
Sintering Temperature ◽  
High Speed Steel ◽  
Continuous Heating ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
The Impact

Effects of sintering temperatures on the microstructure and mechanical performance of SPS M3:2 high speed steel prepared by spark plasma sintering was studied. High speed steel sintering curve of continuous heating from ambient temperature to 1200°C was estimated to analyze the sintering processes and sintering temperature range. The sintering temperature within this range was divided into groups to investigate hardness, relative density and microstructure of M3:2 high-speed steel. Strip and quadrate carbides were observed inside the equiaxed grains. SPS sintering temperature at 900°C can lead to nearly full densification with grain size smaller than 20μm. The hardness and bending strength are higher than that of the conventionally powder metallurgy fabricated ones sintered at 1270°C. However, fracture toughness of the high speed steel is lower than that of the conventional powder metallurgy steels. This can be attributed to the shape and distribution of M6C carbides which reduce the impact toughness of high speed steels.

Tribological Characteristic of Tool Steel Surface Layer Alloyed Using Laser

2020 ◽  
Vol 308 ◽  
pp. 110-118
Author(s):  
Mirosław Bonek ◽  
Eva Tillová
Keyword(s):  
Surface Layer ◽  
High Speed ◽  
Structural Changes ◽  
Dendritic Structure ◽  
High Speed Steel ◽  
Beam Power ◽  
Ceramic Phase ◽  
Structural Mechanism ◽  
Conventional Heat Treatment ◽  
The Impact

The article presents the results of research on the impact of laser surface treatment on selected steel properties. The laser treatment consisted of remelting and alloying high speed steel using hard ceramic phase powders. A high-power diode laser was used in the experiment to examine the effect of parameters such as beam power and powder type on the structure and properties of the surface layer. A structural mechanism was observed consisting in obtaining, after laser processing, a super fine crystalline structure and a dendritic structure at the remelting zone. Structural changes have been found to be associated with improved properties such as hardness, microhardness and wear resistance. Steel treated with conventional heat treatment was used as a comparative material.

PROPERTIES AND CUTTING PERFORMANCE OF TiAlSiN COATING PREPARED BY CATHODE ARC ION PLATING

2016 ◽  
Vol 23 (06) ◽  
pp. 1650055 ◽  
Author(s):  
ER-GENG ZHANG ◽  
QIANG CHEN ◽  
QIN-XUE WANG ◽  
BIAO HUANG
Keyword(s):  
Coating Thickness ◽  
High Speed ◽  
Energy Dispersive Spectrometer ◽  
Orthogonal Cutting ◽  
High Speed Steel ◽  
Cutting Performance ◽  
Preparation Procedure ◽  
Fluorescence Measurement ◽  
Cutting Experiment ◽  
Tialsin Coating

TiAlSiN coating was deposited on high-speed steel (HSS) samples and cemented carbide tool inserts, respectively, by a new coating preparation procedure, and its properties and cutting performance were characterized. The coating thickness, chemical composition, microstructure morphology and mechanical properties were investigated by X-ray fluorescence measurement system, energy dispersive spectrometer (EDS), scanning electron microscope (SEM), nanoindentation, Rockwell hardness tester and ball-on-disc tribometer. A 3D orthogonal cutting experiment model was established by DEFORM-3D to study the influences of different coating thicknesses on cutting force and temperature, and the field cutting experiment was carried out. The results show that the thickness of TiAlSiN coating is 3.14[Formula: see text][Formula: see text]m prepared by the 3[Formula: see text][Formula: see text]m preparation procedure, microhardness is 36.727[Formula: see text]GPa with the Si content of about 5.22[Formula: see text]at.% as well as good fracture toughness and adhesion strength. The TC4 and AISI 1045 cutting tool inserts with 4[Formula: see text][Formula: see text]m coating thickness have the minimum cutting forces of about 734.7[Formula: see text]N and 450.7[Formula: see text]N, respectively. Besides, tool inserts with a thickness of 3[Formula: see text][Formula: see text]m have the minimum cutting temperatures of about 510.2[Formula: see text]C and 230.6[Formula: see text]C, respectively.

Research on Vibration Tapping of Hardened Steel

2006 ◽  
Vol 315-316 ◽  
pp. 51-55
Author(s):  
R.D. Han ◽  
B.L. Yin
Keyword(s):  
High Speed ◽  
Torsional Rigidity ◽  
Influencing Factor ◽  
High Speed Steel ◽  
Hardened Steel ◽  
Small Hole ◽  
Theoretic Analysis ◽  
Practical Solution ◽  
Micro Cracks ◽  
The Impact

As high-speed steel tap is incapable of small-hole tapping (M3) in hardened steel, vibration tapping is introduced in this paper to solve this problem. Theoretic analysis with fracture mechanics indicates that the impact effect of the tap on the workpiece results in extended micro cracks and a much lower tapping torque. And the torsional rigidity of the tap is enforced in vibration tapping as proved by dynamic analysis. The experimental results show that with well chosen amplitudes, tapping torque decreases as vibration frequency increases and increases with the increase of net cutting time ratio, with the latter being the more significant influencing factor. In vibration tapping of hardened steel, 24 threads can be machined with a single tap. Vibration tapping is then proved to be a practical solution to the problem of small-hole tapping in hardened steel.

scholarly journals Impact and Ricochet of a High Speed Projectile from a Plate

2021 ◽  
Vol 71 (6) ◽  
pp. 737-747
Author(s):  
Hussein Bassindowa ◽  
Bakhtier Farouk ◽  
Steven B. Segletes
Keyword(s):  
Titanium Alloy ◽  
High Speed ◽  
Computational Study ◽  
Incident Angle ◽  
Finite Thickness ◽  
Impact Angle ◽  
Projectile Velocity ◽  
Alloy Plate ◽  
Impact Angles ◽  
The Impact

A computational study of a projectile (either 2024 aluminum or TiAl6V4 titanium alloy) impacting a plate (either titanium alloy or aluminum) is presented in this paper. Projectile velocity (ranging from 250 m/s to 1500 m/s) with varying impact angles are considered. The presence of ricochet (if any) is identified over the ranges of the projectile velocity and impact angle considered. For the cases where ricochet is identified, the ricochet angle and velocity are predicted as functions of the incident angle and the incident velocity. The numerical results are compared with an analytical solution of the ricochet problem. The analytical solutions are from a model developed to predict the ballistic ricochet of a projectile (projectile) penetrator. The dynamics and the deformation of an aluminum (or a titanium alloy) projectile impacting on a finite thickness titanium alloy (or aluminum) plate are simulated. The current work is interesting in that it looks in the field of ballistics of different material combinations than are traditionally studied. The present simulations based on detailed material models for the aluminum and the titanium alloy and the impact physics modelling features in the LS-DYNA code provide interesting details regarding the projectile/plate deformations and post-impact projectile shape and geometry. The present results indicate that for no cases (for specified incoming velocities and impact angles considered) can an aluminum projectile penetrate a titanium alloy plate. The ricochet ‘mode predictions ‘obtained from the present simulations agree well with the ricochet ‘mode predictions’ given in an analytical model.

An Investigation into the Dependency of Cutting Forces on the Volume Fraction and Fibre Orientation during Machining Composite Materials

2017 ◽  
Vol 882 ◽  
pp. 61-65
Author(s):  
Fadi Kahwash ◽  
Islam Shyha ◽  
Alireza Maheri
Keyword(s):  
Cutting Forces ◽  
High Speed ◽  
Volume Fraction ◽  
Fibre Orientation ◽  
Orthogonal Cutting ◽  
Fibre Volume Fraction ◽  
High Speed Steel ◽  
Fibre Volume ◽  
Force Model ◽  
High Dependency

This paper presents an empirical force model quantifying the effect of fibre volume fraction and fibre orientation on the cutting forces during orthogonal cutting of unidirectional composites. Glass fibre plates and high speed steel cutting tools are used to perform orthogonal cutting on shaping machine whereas cutting forces are measured using platform force dynamometer. The analysis of forces shows almost linear dependency of cutting forces on the fibre content for both cutting and thrust forces. High dependency of cutting forces is also observed on fibre orientation with high percentage contribution ratio (up to 95.31%). Lowest forces corresponded to 30o and highest to 90o fibre orientation. Multivariate regression technique is used to construct the empirical model.

The effect of coatings on the cutting process, friction, forces and predictive cutting models in machining operations

2002 ◽  
Vol 216 (3) ◽  
pp. 347-356 ◽  
Author(s):  
E J A Armarego ◽  
S Verezub ◽  
P Samaranayake
Keyword(s):  
High Speed ◽  
Thrust Force ◽  
Orthogonal Cutting ◽  
High Speed Steel ◽  
Cutting Process ◽  
Force Component ◽  
Friction Forces ◽  
Technological Performance ◽  
The Many ◽  
Machining Operations

The effects of the popular TiN and TiCN coatings on the cutting process, friction and predictive mechanics of cutting models for forces and power in machining operations are investigated. Extensive orthogonal cutting and turning tests on steel work materials have shown that the cutting process and predictive force models are not qualitatively affected by these coatings. Quantitatively, both coatings are equally effective in reducing the friction, forces and power in orthogonal cutting when applied to high-speed steel (HSS) tools and equally ineffective when applied to carbide tools. Both TiN and TiCN coatings applied to HSS tools resulted in modest reductions in the power force component and power of 12–30 per cent ‘on average’ with larger reductions in the thrust force component of about 50 per cent ‘on average’. Considerably more research seems necessary to understand better and to predict quantitatively the effects of the many coating-substrate combinations on the technological performance of machining operations, essential for optimizing the economic performance of these operations.

Study of Fracture Resistance of Nanolaminate Coatings Using Indentation and Impact Tests

2016 ◽  
Vol 258 ◽  
pp. 318-321 ◽  
Author(s):  
Vilma Buršíková ◽  
Jaroslav Sobota ◽  
Jan Grossman ◽  
Tomáš Fořt ◽  
Libor Dupák ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnetron Sputtering ◽  
Fracture Resistance ◽  
High Speed ◽  
High Speed Steel ◽  
Dynamic Impact ◽  
Impact Tests ◽  
Load Limit ◽  
Steel Substrates ◽  
The Impact

The aim of the present work was to study the mechanical properties of thin nanocomposite Mo-B-C coatings consisting of nanocrystalline Mo2BC embedded in amorphous Mo-B-C matrix. Magnetron sputtering of three targets, B4C, C and Mo, was used for coatings preparation. The Mo-B-C coatings were deposited on high speed steel substrates. The fracture resistance of Mo-B-C coatings was studied by both indentation and dynamic impact tests. The impact tests enabled us to predict the load limit causing the coating destruction.

Microstructure and Mechanical Properties of Spray Deposited W9Mo3Cr4V High Speed Steel

2011 ◽  
Vol 391-392 ◽  
pp. 714-718
Author(s):  
Rui Zhou ◽  
Jian Fei Sun ◽  
Ying Jun Yang
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
High Speed ◽  
Bending Strength ◽  
Spray Deposition ◽  
High Speed Steel ◽  
Solidification Shrinkage ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
The Impact

Microstructure and mechanical properties of W9Mo3Cr4V high speed steel fabricated by spray deposition have been studied. Spray deposited W9Mo3Cr4V high speed steel has a typical equiaxed structure which is finer and more homogeneous with a grain size of 20-30 micrometer compared with conventional casted counterparts. There are pores in the matrix of the deposited steel, which involve gas porosity, filling porosity and solidification shrinkage. As-deposited high speed steel is mainly composed of martensite, austenite and carbides which comprise MC carbide and M6C carbide. Mechanical properties show that the hardness and bending strength of the as-deposited steel are higher than that of the conventionally casted ones. However, impact toughness of the high speed steel is lower than that of the conventionally casted steel, which can be attributed to the existence of porosities and M6C carbides which reduce the impact toughness of high speed steels.

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