Diffusion and Structural Changes in High-Speed Steels Alloyed with Boron

2009 ◽  
Vol 283-286 ◽  
pp. 279-284 ◽  
Author(s):  
Alexander S. Chaus
Keyword(s):  
High Speed ◽  
Structural Changes ◽  
Diffusion Processes ◽  
Final Heat Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Eutectic Carbides ◽  
Structure And Phase Transformations ◽  
Kinetics Of ◽  
Quenching And Tempering

The structure and phase composition of high-speed steels of different grades additionally alloyed with boron after casting, annealing, and subsequent final heat treatment (quenching and tempering) have been studied focusing on diffusion processes. In order to investigate kinetics of both the structure and phase transformations in eutectic carbides upon heat treatments, different techniques of optical microscopy, electron microscopy (both scanning and transmission ones), X-ray diffraction, and energy dispersive X-ray analysis have been used.

Diffusion and Transformation of Eutectic Carbides in High-Speed Steels during Heat Treatment

2009 ◽  
Vol 283-286 ◽  
pp. 273-278 ◽  
Author(s):  
Alexander S. Chaus ◽  
Matej Beznák
Keyword(s):  
Heat Treatment ◽  
High Speed ◽  
Diffusion Processes ◽  
Final Heat Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Eutectic Carbides ◽  
Structure And Phase Transformations ◽  
Kinetics Of ◽  
Quenching And Tempering

The structure and phase composition of high-speed steels of different grades after casting, annealing, and subsequent final heat treatment (quenching and tempering) have been studied focusing on diffusion processes. In order to investigate kinetics of both the structure and phase transformations in eutectic carbides upon heat treatments, different techniques of optical microscopy, electron microscopy (both scanning and transmission ones), X-ray diffraction, and energy dispersive X-ray analysis have been used.

Effect of Austenitising Temperature on Structural Changes in Modified High-Speed Steel of AISI M2 Type

2012 ◽  
Vol 326-328 ◽  
pp. 348-353 ◽  
Author(s):  
Alexander S. Chaus ◽  
Matej Beznák ◽  
M. Bohačík ◽  
Ján Porubský ◽  
P. Úradník
Keyword(s):  
High Speed ◽  
Structural Changes ◽  
Diffusion Processes ◽  
High Speed Steel ◽  
Phase Changes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Eutectic Carbides ◽  
Electron Scanning Microscopy ◽  
Powder Addition

The transformation of the solidification microstructure and the phase changes in AISI M2 grade high-speed steel modified with powder addition of TiB2have been studied focusing on the effect of austenitising temperatures. In order to investigate kinetics of both the microstructure and phase transformations in eutectic carbides, primarily M2C carbide decomposition, upon heat treatments with respect to diffusion processes, different techniques of electron scanning microscopy, X-ray diffraction analysis and energy dispersive X-ray spectrometry have been used.

Effect of Austenitising Temperature on Microstructural Changes in High-Speed Steel of M2 Type Inoculated with Addition of WC Powder

2013 ◽  
Vol 333 ◽  
pp. 27-32 ◽  
Author(s):  
Alexander S. Chaus ◽  
Matej Beznák ◽  
Ján Porubský ◽  
J. Sojka
Keyword(s):  
Phase Transformations ◽  
High Speed ◽  
Diffusion Processes ◽  
High Speed Steel ◽  
Xrd Analysis ◽  
Solidification Microstructure ◽  
Eutectic Carbides ◽  
Electron Scanning Microscopy ◽  
Powder Addition ◽  
Kinetics Of

The transformation of the solidification microstructure in AISI M2 grade high-speed steel inoculated with powder addition of WC have been studied focusing on the effect of austenitisation. In order to investigate the kinetics of both the microstructure and phase transformations in eutectic carbides, primarily M2C carbide decomposition, upon heat treatments with respect to diffusion processes, electron scanning microscopy, XRD analysis and EDS have been used.

Study on Surface Metallurgy High Speed Steel Using Double Glow Plasma Technique

2007 ◽  
Vol 353-358 ◽  
pp. 1708-1711
Author(s):  
Jin Yong Xu ◽  
Yuan Gao ◽  
Mei Fa Huang ◽  
Jun Cheng ◽  
Zhong Xu
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Carbon Steels ◽  
Alloyed Layer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Treated Sample ◽  
Surface Carbide ◽  
Glow Plasma ◽  
Quenching And Tempering

Mo-Cr diffusion layer on carbon steels are prepared by double glow plasma surface metallurgy and then treated by ultra-saturated carbonization, quenching and tempering. The content of component is roughly that of high-speed steels (HSS). The results showed that the depth of coating is over 100μm and the content of Mo, Cr alloyed layer is about 20% and 10% respectively. Surface carbon content is over 2.0% after ultra-saturated carbonization. The carbides of the alloyed layer are fine and dispersed, without coarse eutectic ledeburite. X-ray diffraction showed that the carbides are M6C, M2C, M23C6 etc. SEM analyse indicated that the dimension of surface carbide is less 1μm. The abrasion experimental results showed that the relative wear resistance of the treated sample was 2.38 times as that of quenched GCr15.

scholarly journals High-speed time resolved X-ray diffraction studies on the thin filament structural changes during muscle force development

2003 ◽  
Vol 43 (supplement) ◽  
pp. S124
Author(s):  
T. Tamura ◽  
J. Wakayama ◽  
K. Inoue ◽  
T. Oka ◽  
N. Yagi ◽  
...  
Keyword(s):  
High Speed ◽  
Thin Filament ◽  
Structural Changes ◽  
Muscle Force ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Force Development

scholarly journals Dilatometric and Microstructural Study of Martensite Tempering in 4% Mn Steel

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4442 ◽  
Author(s):  
Adam Grajcar ◽  
Mateusz Morawiec ◽  
Jose Antonio Jimenez ◽  
Carlos Garcia-Mateo
Keyword(s):  
Precipitation Kinetics ◽  
X Ray Diffraction ◽  
High Tempering ◽  
X Ray ◽  
Relative Change ◽  
Mn Steel ◽  
Kinetics Of ◽  
Quenching And Tempering ◽  
Tempering Time ◽  
Tempering Resistance

This paper presents the results of martensite tempering resistance in 4% Mn steel. The material was quenched and tempered at 350 °C for 15, 30, and 60 min. The analysis of the quenching and tempering was carried out using dilatometric and microstructural approaches. The phase composition was assessed using X-ray diffraction. The Ms temperature and tempering progress were simulated using JMatPro software. The dilatometric analysis revealed a small decrease in the relative change in length (RCL) during tempering. This decrease was connected to the precipitation kinetics of cementite within the martensite laths. The microstructure investigation using a scanning electron microscope showed a very small amount of carbides, even for the longest tempering time. This showed the high tempering resistance of the martensite in medium-Mn steels. The hardness results showed an insignificant decrease in the hardness depending on the tempering time, which confirmed the high tempering resistance of martensite.

Diffusion in MC Carbides in High-Speed Steels during High-Temperature Treatments

2010 ◽  
Vol 297-301 ◽  
pp. 1065-1070 ◽  
Author(s):  
Alexander S. Chaus ◽  
Matej Beznák
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Chemical Composition ◽  
High Speed ◽  
Diffusion Processes ◽  
Volume Fraction ◽  
High Speed Steel ◽  
Final Heat Treatment ◽  
Quenching And Tempering ◽  
Strong Diffusion

The microstructure and chemical composition of MC carbides in the modified variants of AISI M2 type high-speed steel after casting, annealing, carburising and subsequent final heat treatment (quenching and tempering) have been studied by focusing on diffusion processes in these carbides and their stability during high-temperature treatments. Significant changes in both the microstructure and chemical composition of the MC carbides as well as in their volume fraction shown to occur in the high-speed steels studied were attributed to decomposition, coagulation and dissolution of these carbides during heat treatments caused by strong diffusion of alloying elements and carbon. It was also shown that boron, in general, strongly suppressed the diffusion of carbon during carburising.

scholarly journals Structure and Properties of Surface Layers: X-ray Diffraction Studies

1988 ◽  
Vol 41 (2) ◽  
pp. 261 ◽  
Author(s):  
R Delhez ◽  
ThH de Keijser ◽  
EJ Mittemeijer ◽  
BJ Thijsse ◽  
MA Hollanders ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
Structural Changes ◽  
Diffusion Processes ◽  
Bulk Material ◽  
Effective Diffusion ◽  
Solid Material ◽  
X Rays ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
X Ray

Because X-rays are strongly absorbed on propagation through solid material, X-ray diffraction analysis can be fruitfully applied in the study of surface layers. After a brief discussion of some aspects of X-ray diffraction analysis of surface layers, attention is focussed on investigations of stress development and interdiffusion in surface layers. The behaviour of surface layers depends largely on their state of (residual) macro- and microstress. The development and possible relaxation of macrostress in surface layers can originate from the thermally imposed difference in shrink or expansion between layer and substrate, from developing concentration profiles and from structural changes, in particular phase transformations. Diffusion processes in multilayers, composed of alternately stacked sublayers of elements A and B, are highly affected by the multitude of interfaces and therefore differ from those in bulk material. The effective diffusion coefficients can be determined from the decrease of the intensity of the reflections corresponding to the composition-modulation period [so-called (000) satellites], and the change of the integrated intensities of reflections from produced or retained crystalline components. Examples of interdiffusion in an amorphous multilayer (in conjunction with structural relaxation) and in a crystalline multilayer (leading to amorphisation) are presented.

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