A Relationship between the Crystalization Rate and the Structure and Strength Characteristics or the Fe-C-Cr, Fe-C-Cr-Ti and Fe-C-Cr-Ce Alloys Subjected to Directional Solidification

1984 ◽  
Vol 34 ◽  
Author(s):  
Edward Fras ◽  
Edward Guzik ◽  
Antoni Karamara
Keyword(s):  
Growth Rate ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Directional Solidification ◽  
Strength Characteristics ◽  
A Value ◽  
Coupled Growth

ABSTRACTThe paper present the results of investigation into the directional solidification of Fe-C-Cr alloys containing about 30% Cr and various contents of carbon. The main types of the structure of these alloys were given and the zone of a coupled growth of the eutectic was determined as well as an effect of the growth rate on the interfacial distance λ and on the tensile strengthof these alloys. It was proved that the additions of titanium and cerium considerably reduce the distance λ and increase the tensile strength, which in the case of an Fe-Cr-C-Ce alloy can reach a value of about 3250 MPa. The alloys solidified in the form of bars and plates which also enabled the determination of an effect of angle between the axis of the carbide fibres and the direction of loading on the ultimate tensile strength. of these alloys.

Dependence of Microstructures and Mechanical Properties on the Growth Rate and Composition in Directionally Solidified Mg-Gd Alloys

2022 ◽  
Vol 327 ◽  
pp. 82-97
Author(s):  
He Qin ◽  
Guang Yu Yang ◽  
Shi Feng Luo ◽  
Tong Bai ◽  
Wan Qi Jie
Keyword(s):  
Mechanical Properties ◽  
Growth Rate ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Dendritic Structure ◽  
Directionally Solidified ◽  
Dendrite Morphology ◽  
Microstructural Parameters ◽  
Wide Range ◽  
Microstructures And Mechanical Properties

Microstructures and mechanical properties of directionally solidified Mg-xGd (5.21, 7.96 and 9.58 wt.%) alloys were investigated at a wide range of growth rates (V = 10-200 μm/s) under the constant temperature gradient (G = 30 K/mm). The results showed that when the growth rate was 10 μm/s, different interface morphologies were observed in three tested alloys: cellular morphology for Mg-5.21Gd alloy, a mixed morphology of cellular structure and dendritic structure for Mg-7.96Gd alloy and dendrite morphology for Mg-9.58Gd alloy, respectively. Upon further increasing the growth rate, only dendrite morphology was exhibited in all experimental alloys. The microstructural parameters (λ1, λ2) decreased with increasing the growth rate for all the experimental alloy, and the measured λ1 and λ2 values were in good agreement with Trivedi model and Kattamis-Flemings model, respectively. Vickers hardness and the ultimate tensile strength increased with the increase of the growth rate and Gd content, while the elongation decreased gradually. Furthermore, the relationships between the hardness, ultimate tensile strength, the growth rate and the microstructural parameters were discussed and compared with the previous experimental results.

The dependence of the strength characteristics of the type of wood glue

2015 ◽  
Vol 8 (2) ◽  
pp. 53-55
Author(s):  
Струцкая ◽  
M. Strutskaya ◽  
Гусев ◽  
V. Gusev ◽  
Стородубцева ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Electromagnetic Field ◽  
Strength Characteristics

Determination of tensile strength of laminated wood, depending on the adhesive used, the type of wood and its electromagnetic field treatment.

Transition from Grey to White and White to Grey in Fe-C-X Eutectic Alloys

1984 ◽  
Vol 34 ◽  
Author(s):  
P. Magnin ◽  
W. Kurz
Keyword(s):  
Growth Rate ◽  
Directional Solidification ◽  
Growth Rates ◽  
Opposite Effect ◽  
Eutectic Temperature ◽  
Alloying Elements ◽  
Qualitative Model ◽  
Eutectic Alloys ◽  
Temperature Growth

ABSTRACTThe effect of small additions of Si, P, Cr, Mn and Ti on transition velocities from grey to white and white to grey of pure Fe-C eutectics has been measured by varying growth rates in directional solidification experiments. Growth undercoolings were measured as a function of growth rate, while white and grey eutectic temperatures were obtained from DTA experiments. As a result of these experiments, alloying elements can be classified into three categories : graphitizing (Si, P), carburizing (Cr) and “opposite effect” (Mn, Ti). Each category is characterized by a given influence on eutectic temperature, growth undercooling, and nucleation of cementite. A qualitative model which permits determination of the influence of alloying elements on these latter three parameters is proposed.

Determination of the ultimate tensile strength of ceramics up to 2500 K in the environment of combustion gases

Refractories ◽  
1990 ◽  
Vol 31 (3-4) ◽  
pp. 153-155
Author(s):  
O. V. Bakunov ◽  
E. P. Pakhomov ◽  
Yu. I. Chubarov
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Combustion Gases

scholarly journals Optimization of Friction Stir Processing Parameters for Aluminum Alloy (AA6061-T6) Using Taguchi Method

2019 ◽  
Vol 12 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Muna K. Abbassa ◽  
Noor Alhuda B. Sharhan
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Ultimate Tensile Strength ◽  
Taguchi Method ◽  
Friction Stir Processing ◽  
Thick Plate ◽  
Processing Parameters ◽  
Friction Stir ◽  
Tool Tilt Angle

This work is devoted toward optimization of the parameters of the friction stir processing (FSP) which effect on tensile strength of aluminium alloy AA6061-T6 of 6mm thick plate by applying a certain number of tests utilizing the Taguchi method. Design of experiment (DOE) has been applied for the determination of the most important parameters influencing ultimate tensile strength. FSP was achieved under three different rotation speeds (800,1000 and 1250) rpm, different transverse speeds (16,25 and 32) mm\min, and number passes(1,2 and 3)  in the same direction and tool tilt angle was 2°  with using threaded cylindrical pin profile.  The best FSP parameters were 1250 rpm and 32 mm\min and two passes. It was found that the higher hardness value was 75HV in stir zone center and then decreases toward the TMAZ, HAZ and the base metal

scholarly journals Full-annealing and its effect on the Mechanical Properties of Alloy 304H Stainless Steel

2021 ◽  
pp. 28-44
Author(s):  
Anthony Edozie Onwudili ◽  
Sunday Chukwuka Iweka
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Service Life ◽  
Ultimate Tensile Strength ◽  
Annealed Sample ◽  
Muffle Furnace ◽  
A Value ◽  
Short Service Life ◽  
Full Annealing

Stainless steel is an alloy of steel which contains at least 10.5% chromium, less than 1.2% carbon, and other alloying elements and it is widely used in many industries globally and their properties are highly influenced by their microstructure, heat treatment or by plastic deformation. But due to hardness, poor wear, and corrosion resistance, leading to short service life, there is need to investigate the effect of annealing on the mechanical properties of alloy 304H stainless steel and how the mechanical properties can be improved with a view of improving its service life and optimizing engineering usage. Sixteen (16) samples of the alloy were used. Twelve (12) samples were annealed at three different temperatures of 950oC, 1000oC and 1050oC inside a muffle furnace. At each temperature four samples were heat-treated inside the muffle furnace for 30 minutes. The result showed that the yield strength decreased from un-annealed sample to annealed samples at 950oC with a value of 504.8MPa and increased at 1000oC with a value of 610MPa and a decrease of 323.8 MPa was obtained at 1050oC. Also, the ultimate tensile strength showed an increase from   950oC with a value of 826.3MPa to 1000oC with a value of 930MPa but there was a slight decrease at 1050oC for all samples. The ultimate tensile strength at 1000oC with a value of 930MPa was the highest in all the samples. The annealed samples at 1000oC had the highest percentage elongation of 13.57% which shows an increase in the ductility of the material. The hardness of the material decreased from 157.25 BHN at 950oC to 134.00BHN at 1000oC. An increase to 169.50BHN was however obtained at 1050oC. Thus, full-annealing of alloy 304H stainless steel at 1000oC increases in ductility as hardness decreases.

scholarly journals Modification of Aluminium-Silicon Near-Eutectic Alloy with Use of Electrolysis of Sodium Salt

2017 ◽  
Vol 62 (4) ◽  
pp. 2371-2374 ◽  
Author(s):  
A. Białobrzeski ◽  
J. Pezda ◽  
A. Jarco
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Liquid Alloy ◽  
Eutectic Alloy ◽  
Sodium Salt ◽  
Sodium Salts ◽  
Physical Chemical ◽  
Metallic Bath ◽  
Metallurgical Processes

AbstractThe present work discusses results of preliminary tests concerning the technology of continuous dosage of sodium to a metallic bath from the aspect of modification of EN AC-44200 alloy, through the use of a multiple compound (salt) of sodium. The technology consists in continuous electrolysis of sodium salts occurring directly in a crucible with liquid alloy. As a measure of the degree of alloy modification over the course of testing, the ultimate tensile strength (UTS or Rm) and analysis of microstructure are taken, which confirm the obtained effects of the modification on the investigated alloy. Assurance of stable parameters during the process of continuous modification with sodium, taking into consideration the fact of complex physical-chemical phenomena, requires additional tests aimed at their optimization and determination of a possibility of implementation of such technology in metallurgical processes.

Determination of the ultimate tensile strength of rocks by the unaixial compression test data

2009 ◽  
Vol 45 (3) ◽  
pp. 235-239 ◽  
Author(s):  
B. A. Rychkov ◽  
Zh. Y. Mamatov ◽  
E. I. Kondrat’eva
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Test Data ◽  
Compression Test
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