scholarly journals Influence of molybdenum on corrosion and mechanical properties of carbon steel joint welds

2019 ◽  
Vol 1 (52) ◽  
pp. 226-231
Author(s):  
Valerii Makarenko ◽  
Yuriy Vynnykov ◽  
Andrii Manhura
Keyword(s):  
Mechanical Properties ◽  
Experimental Studies ◽  
Structural Components ◽  
Electrode Coating ◽  
Fine Grained ◽  
Metal Joint ◽  
Sulfide Corrosion ◽  
Fine Grained Structure ◽  
Steel Joints ◽  
Metallic Impurities

The results of experimental studies of the molybdenum impurity influence on corrosion and mechanical properties of carbonsteel (Grade 20) joint welds are presented in the article. In particular, it has been found that the highest and stable values ofthe impact strength and resistance properties of cracks (К1s and δs), as well as the resistance to sulfide corrosion cracking ofthe metal of tubular steel joints, are achieved at a concentration of molybdenum in it from 0,2 to 0,4%, which is realized byputting a molybdenum powder in the electrode coating in the amount of 0,5-1,0%. On the basis of the obtained results an optimalchemical composition of the weld metal was determined which is characterized by a fine-grained structure with a smallamount of non-metallic impurities of globular shape. Optimal content of the doping micro-additive - molybdenum should beselected, based on both the influence of molybdenum on the size of structural components, but, most importantly, on its effecton the corrosion and mechanical properties of metal joint weld.

scholarly journals STRUCTURE AND PROPERTIES OF AZ31 MAGNESIUM ALLOY AFTER COMBINATION OF HOT EXTRUSION AND ECAP

2017 ◽  
Vol 23 (3) ◽  
pp. 222 ◽  
Author(s):  
Ondřej Hilšer ◽  
Stanislav Rusz ◽  
Wojciech Maziarz ◽  
Jan Dutkiewicz ◽  
Tomasz Tański ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Hot Extrusion ◽  
Az31 Magnesium Alloy ◽  
Initial State ◽  
Fine Grained ◽  
Angular Pressing ◽  
Ecap Process ◽  
Average Grain Size ◽  
Fine Grained Structure

<p>Equal channel angular pressing (ECAP) method was used for achieving very fine-grained structure and increased mechanical properties of AZ31 magnesium alloy. The experiments were focused on the, in the initial state, hot extruded alloy. ECAP process was realized at the temperature 250°C and following route Bc. It was found that combination of hot extrusion and ECAP leads to producing of material with significantly fine-grained structure and improves mechanical properties. Alloy structure after the fourth pass of ECAP tool with helix matrix 30° shows a fine-grained structure with average grain size of 2 µm to 3 µm and high disorientation between the grains. More experimental results are discussed in this article.</p>

scholarly journals Microstructural and Mechanical Characterization of Multilayered Iron Electrodeposits

2011 ◽  
Vol 409 ◽  
pp. 474-479 ◽  
Author(s):  
C. Chan ◽  
J.L. McCrea ◽  
G. Palumbo ◽  
Uwe Erb
Keyword(s):  
Mechanical Properties ◽  
Columnar Structure ◽  
Multilayered Structure ◽  
Structure Design ◽  
Coarse Grained ◽  
Fine Grained ◽  
Microstructure And Mechanical Properties ◽  
Fine Grained Structure ◽  
Iron Coatings

Monolithic and multilayered iron electrodeposits were successfully synthesized by the pulse plating electrodeposition method. Electron microscopy and Vickers microhardness measurements were used to investigate the microstructure and mechanical properties of the iron electrodeposits produced. Two types of monolithic iron coatings were produced, one with a coarse grained, columnar structure and the other with an ultra-fine grained structure. Hall-Petch type grain size strengthening was observed in these monolithic coatings. Multilayered iron coatings composed of alternating layers of coarse grained and fine grained structures were also produced. The hardness value of the multilayered coatings falls between the hardness values for the two types of monolithic coatings produced. This study has demonstrated the possibility of applying a multilayered structure design to tailor the microstructure and mechanical properties of electrodeposited iron coatings.

scholarly journals Fine grained concrete structures reliability assessment: theory and investigational studies

2018 ◽  
Vol 251 ◽  
pp. 02002 ◽  
Author(s):  
Sergey Parfenov ◽  
Anatoly Alekseytsev ◽  
Yuriy Vinokurov
Keyword(s):  
Mechanical Properties ◽  
Modulus Of Elasticity ◽  
Experimental Studies ◽  
Reliability Assessment ◽  
Concrete Structures ◽  
Fine Grained ◽  
Different Ages ◽  
Emergency Actions ◽  
General Safety

Describes the theoretical preconditions of using mechanical properties of fine-grained concrete in the design of concrete structures subject to risks and the general safety. A technique for experimental studies and data on the fine-grained concrete deformative properties at different ages and different loading levels are presented. The regularities of the modulus of elasticity change from strength, type and age of concrete are revealed. Full diagrams of deformation of concrete are constructed. The results obtained can be used in the design of the fine-grained concrete structures in buildings having risks occurrence socioeconomic losses and able to resist of emergency actions.

Magnetic Pulse Compaction of Oxide Powders of the (ZrO2 – Y2O3) – Al2O3 System

2014 ◽  
Vol 1040 ◽  
pp. 819-823 ◽  
Author(s):  
Aleksander S. Ivashutenko ◽  
Nikita Martyushev ◽  
Igor G. Vidayev
Keyword(s):  
Mechanical Properties ◽  
Sintering Temperature ◽  
Physical And Mechanical Properties ◽  
Operating Principle ◽  
Magnetic Pulse ◽  
Fine Grained ◽  
Oxide Powders ◽  
Fine Grained Structure ◽  
Ampere’S Law ◽  
Ampère’S Law

Technology for manufacturing products by magnetic pulse compaction from oxide powders of the (ZrO2 – Y2O3) – Al2O3 system is presented in the paper. Diagram of the magnetic-pulse press with its operating principle being based on Ampere's law is given. Physical and mechanical properties of the obtained compacts are determined. The main feature of the designed technology is the reduced sintering temperature (200 °С) and the acquired fine-grained structure of the products. Another significant advantage achieved by applying the technology is the possibility for manufacturing fine-grained structure ceramic products with high mechanical properties.

Carbon seal materials with superior mechanical properties and fine-grained structure fabricated by a new process

2007 ◽  
Vol 61 (8-9) ◽  
pp. 1816-1819 ◽  
Author(s):  
Zhanjun Liu ◽  
Quangui Guo ◽  
Yan Song ◽  
Jingli Shi ◽  
Jinren Song ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fine Grained ◽  
New Process ◽  
Fine Grained Structure ◽  
Superior Mechanical Properties

The Application of Nano-Structured Silica Based Admixture in Gypsum Binders

2014 ◽  
Vol 1611 ◽  
pp. 165-170 ◽  
Author(s):  
E.V. Voitovich ◽  
A.V. Cherevatova ◽  
I.V. Zhernovsky ◽  
H.-B. Fisher ◽  
K. Sobolev
Keyword(s):  
Quartz Sand ◽  
Mechanical Performance ◽  
Experimental Studies ◽  
Experimental Program ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Fine Grained ◽  
Fine Grained Structure ◽  
Size And Morphology ◽  
Nanostructured Silica

ABSTRACTThis article reports on a new composite gypsum binder (CGB) with nanostructured silica-based admixture (NSS). NSS is obtained by a wet ultrafine milling of quartz sand resulting in the formation of an inorganic polydisperse binding system, which has a high concentration of active nanoscale phase (about 10%). Developed CGB contains hemihydrate gypsum and nano-component based on quartz sand. It is observed that the addition of 15–20 % of NSS improves the rheological properties of gypsum systems through the formation of solvate shells hindering the access of water to gypsum particles; this process also retards the setting of binder.The experimental program used infrared IR spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM) to reveal the contribution of NSS. The porosity of CGB is analyzed by the kinetics of water adsorption and BET. The XRD and IR investigations determined the formation of a new sulfosilicate phase, hydroxyellestadite during the hydration of CGB. With the addition of NSS an overall reduction in pore volume, as well as the shifts in macro-, meso- and nano- porosity values are observed.Analysis of CGB microstructure reveals that in the presence of the NSS the size and morphology of crystals are changed contributing to the formation of dense fine-grained structure. Experimental studies have demonstrated that the composite gypsum binders with NSS are characterized by reduced water absorption and increased density, as well as improved mechanical performance especially, higher compressive strength.

scholarly journals Effect of ion nitriding by glow discharge on the physical and mechanical properties of the plastically deformed tool steel R6M5

2021 ◽  
Vol 2064 (1) ◽  
pp. 012052
Author(s):  
R K Vafin ◽  
A V Asylbaev ◽  
D V Mamontov ◽  
I D Sklizkov ◽  
G I Raab ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Glow Discharge ◽  
Tool Steel ◽  
Physical And Mechanical Properties ◽  
Coarse Grained ◽  
Steel R6m5 ◽  
Ion Nitriding ◽  
Fine Grained ◽  
Fine Grained Structure

Abstract This work is devoted to the study of the effect of the duration of ion nitriding by glow discharge on the physical and mechanical properties of tool steel with different initial structure. We used specimens of R6M5 tool steel with a coarse-grained structure obtained after annealing at a temperature of 850°C and with a fine-grained structure obtained after severe plastic deformation by torsion discharge. With an increase in the duration of ion nitriding, the thickness of the hardened layer and wear resistance increase. The combination of plastic deformation with ion nitriding by glow discharge increases the adsorption and diffusion rate of the saturating element due to the creation of a highly fragmented and disoriented fine-grained structure and contributed to reduction in processing time.

scholarly journals Mechanical properties of a new high entropy alloy with a duplex ultra-fine grained structure

2018 ◽  
Vol 728 ◽  
pp. 54-62 ◽  
Author(s):  
N.D. Stepanov ◽  
D.G. Shaysultanov ◽  
R.S. Chernichenko ◽  
D.M. Ikornikov ◽  
V.N. Sanin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Fine Grained ◽  
Fine Grained Structure

Research on the Capability of Basal Layer Stabilized Gravel by Cement and Fly-Ash

2012 ◽  
Vol 204-208 ◽  
pp. 3765-3770 ◽  
Author(s):  
Yu Min Han ◽  
Xiao Xing Shi ◽  
Li Wang ◽  
Dao Ming Zhang
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Experimental Studies ◽  
Basal Layer ◽  
Pavement Performance ◽  
Structural Components ◽  
Mix Proportion ◽  
Road Performance ◽  
The Right

Aiming at the basal layer demand on pavement performance in Tu – Wu Highway of Baicheng diversion road, based on the theory of gradution in mixture, experimental studies have been done in grade of gravel and road performance of stabilized gravel by cement and fly-ash. The right amount of cement and fly-ash in mixture can improve spatial structural components of mixture and its mechanical properties. Base on these measured datas, the mixture of cement and fly-ash mixed in the gravel is reasonable and feasible，and the results show its mechanical properties rely on mix proportion of the basal layer.

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