Features of Creation of the Nanostructured Surface Layers on Die Steels at Influence of Intensive Electron Streams in Vacuum

Author(s):  
Milonov A. S. ◽  
◽  
Danzheev B. A. ◽  
Smirnyagina N. N. ◽  
◽  
...  
2015 ◽  
Vol 756 ◽  
pp. 236-242 ◽  
Author(s):  
Yuriy F. Ivanov ◽  
Anton D. Teresov ◽  
Olga V. Ivanova ◽  
Victor E. Gromov ◽  
Evgeniy A. Budovskikh ◽  
...  

The data of the study of the elemental and phase composition, the condition of the defect substructure, mechanical and tribological characteristics of titanium alloy VT6 subjected to electroexplosive carburization with a sample of titanium diboride powder and the subsequent treatment by high-intensity pulsed electron beam is presented. It has been established that the main mechanisms responsible for an increase in the mechanical and tribological properties of the material are solid, dispersion, and grain boundary.


2012 ◽  
Vol 05 ◽  
pp. 335-341
Author(s):  
KAMRAN DEHGHANI

In preset work, the bake hardening behavior of 6056 aluminum alloy with nanostructured layer, produced by surface severe plastic deformation (SSPD), was compared with that of AA6056 with conventional coarse grain structure. Wire brushing process was employed in order to produce surface layers with nanograins. After formation of nanostructured surface layer, the structure was characterized using X-ray Diffraction (XRD) and scanning electron microscopy (SEM) techniques. According to the microhardness measurements, the depth of nanostructured layer, with the grains of 50-110 nm, was about 40-50 μm on each side of specimens. The bake hardenability of the produced nanostructured AA6056 was then studied. The results indicate an increase of about 40% in the bake hardening of nanograin AA6056 comparing to the bake hardening of coarse-grain AA6956. The maximum microhardness of nanograin layer was about 250 HV, whereas it was 65 HV for coarse-grain AA6056.


2014 ◽  
Vol 621 ◽  
pp. 7-12 ◽  
Author(s):  
Zh.M. Blednova ◽  
Peter Olegovich Rusinov ◽  
Anna Pavlovna Jurkova

The results of experimental studies on the formation of the surface layers of a material with shape memory effect (SME) based on TiNi deposition of Pb-Bi melt at a temperature gradient of 600-1100 °C in an argon atmosphere. It is shown that this method allows to obtain uniform surface layers in nanostructured state and almost any thickness can be used for the formation of coatings on the interior surfaces of products of any shape with the stress concentrators. Structure, chemical and phase composition of the surface layers provide a manifestation of TiNi shape memory. The average grain size of TiNi coatings ranges between 60 ÷ 160 nm.


2001 ◽  
Vol 697 ◽  
Author(s):  
X. Wu ◽  
Y. Hong ◽  
J. Lu ◽  
K. Lu

AbstractNanograins were introduced into the surface layers of an Al-alloy during surface vibrational mechanical attrition. Transmission electron microscopy revealed that microstructures developed with an increase in strain, in the following sequence, i.e., lamellar microbands of elongated subgrains, equiaxed submicro-, and nano-grains respectively. The grain subdivision into the subgrains was found to be the main mechanism responsible for grain refinement. The simultaneous evolution of high boundary misorientations was ascribed to the boundary rotation for accommodating further strains. Results showed that the grains could refine remarkably into the nanometer regime (<100 nm) within the outer surface of the layer. The depth of the nanocrystal layers increased and the grain size decreased with the extension of processing time. The nanocrystal layers evidenced an increase in hardness.


2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Gang Ma ◽  
Xiang Ling

Ultrasonic impact treatment (UIT) can be used to create a thin nanostructured surface layer that plays a significant role in enhancing the overall strength, fatigue life, and corrosion resistance of the treated material. The hardness and elastic modulus of surface nanostructured 304 stainless steel treated by UIT have been investigated by nanoindentation and microhardness measurements. The hardness of the top nanostructured surface layer and its elastic modulus are about 38% and 30% higher, respectively, than those of the bulk material in the nanohardness testing. Also, the hardness is increased by about 23% in the Vickers microhardness testing. The nanohardness of the nanostructured surface layers decreases with depth and then trends to stable values. A hardened layer is found in the impact zone and the thickness is approximately 450–500 μm. All results demonstrated that the surface nanocrystallization can effectively enhance the mechanical properties of the 304 stainless steel.


2021 ◽  
Vol 43 (7) ◽  
pp. 853-886
Author(s):  
V. V. Tykhonovych ◽  
◽  
O. M. Grуpachevskуi ◽  
V. G. Novytskyi ◽  
◽  
...  

2007 ◽  
Vol 468-470 ◽  
pp. 164-170 ◽  
Author(s):  
J.W. Tian ◽  
J.C. Villegas ◽  
W. Yuan ◽  
D. Fielden ◽  
L. Shaw ◽  
...  

2018 ◽  
Vol 911 ◽  
pp. 34-38
Author(s):  
Peter Olegovich Rusinov ◽  
Zhesfina Michailovna Blednova

The paper studies the technology of producing composite materials and coatings by means of high-velocity oxygen-fuel spraying (HVOF) in a protective atmosphere. We have developed technologies for the formation of nanostructured surface layers made of multicomponent materials in the conditions of high-velocity oxygen-fuel spraying in order to improve operational properties and expand functional capabilities of engineering products. We optimized technological parameters and constructed nomograph of the process. We described a modernized GLC-720 unit which implements the resource-saving technology for the formation of nanostructured surface layers on cylindrical details, and makes it possible to produce HVOF in a protective atmosphere and thermomechanical processing in a single technological cycle.


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