scholarly journals Influence of hard cold working on microstructure and properties of annealing copper tubes

2002 ◽  
Vol 38 (3-4) ◽  
pp. 163-170 ◽  
Author(s):  
S. Ivanov ◽  
Desimir Markovic
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Mechanical Characteristics ◽  
Annealing Temperature ◽  
Cold Deformation ◽  
Deformation Degree ◽  
Chemical Content ◽  
Lower Annealing Temperature ◽  
Strength And Plasticity ◽  
Strength And Plasticity Characteristics

This work gives results of influence of temperature and deformation degree on changes in the metal grain growth of drawn copper tubes, because this mutual dependence was observed. Copper tubes samples, chemical content of 99,97 % Cu and 0,024 % P, were exposed to recrystallized annealing after drawing. The annealing was carried out at temperatures of 573, 623, 673, 723, 773, 823 and 873 K, for 60 minutes, in laboratory conditions. Investigation results show that after drawing with high cold deformation degree (96 - 99 %), the annealing leads to the changes in the continuous grain growth with increased temperature. The smaller grain size appears at 823 K in comparison with the lower annealing temperature. Annealing has influence on mechanical characteristics of tested samples and during drawing of copper tubes these characteristics are adequately changed: with regard to the annealing at the 773 K, the characteristics of strength and plasticity increase as a result of decreased grain size. The increase of annealing temperature to 873 K leads to the increased grain size and decreased values of strength and plasticity characteristics.

Mathematic Model of Recrystallization of Cu-20Ni-5Sn Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 2252-2256
Author(s):  
Rui Qing Liu ◽  
Li Jun Peng ◽  
Jian Sheng Yang
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Annealing Temperature ◽  
Research Result ◽  
Cold Deformation ◽  
Mathematic Model ◽  
Kinetic Mechanism ◽  
Recrystallization Temperature ◽  
Total Deformation ◽  
Average Grain Size

Research the kinetic mechanism of grain growth of recrystallization of Cu-20Ni-5Sn alloy. The research result shows that the recrystallization temperature declines with the increase of cold-deformation. The recrystallization temperature is at about 500°C ~650°C respectively for 50% and 60% total cold deformation, and is about 470°C ~620°C respectively for 70% and 85% total deformation. The grains grow up with the increase of annealing temperature and holding time. The mathematic model of average grain size can be described as that Cu-20Ni-5Sn alloy annealed at 620°C ~680°C holding 2~10hours.

scholarly journals The impact of cold deformation, annealing temperatures and chemical assays on the mechanical properties of platinum

2010 ◽  
Vol 46 (1) ◽  
pp. 51-57 ◽  
Author(s):  
B. Trumic ◽  
D. Stankovic ◽  
A. Ivanovic
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Annealing Temperature ◽  
Cold Deformation ◽  
Platinum Metals ◽  
Deformation Degree ◽  
Annealing Temperatures ◽  
Flow Limit ◽  
The Impact ◽  
Constant Deformation

In order to form the necessary data base on platinum and platinum metals, certain tests were carried out on platinum samples of different purity of 99.5%, 99.9% and 99.99%. The degree of cold deformation, annealing temperature and chemical assays were tested as well as their impact on the mechanical properties of platinum. The Vickers hardness (HV) values were determined with different deformation degree, starting from annealing temperatures for platinum of different purity and tensile strength (Rm), flow limit (Rp0,2) and elongation (A) in the function of annealing temperatures and annealing time at a constant deformation degree.

scholarly journals Research of structural entropy of sheet aluminium alloys depending on annealing temperature

2018 ◽  
Vol 224 ◽  
pp. 03005
Author(s):  
Ekaterina Nosova ◽  
Fedor Grechnikov ◽  
Natalia Lukonina
Keyword(s):  
Grain Size ◽  
Aluminium Alloys ◽  
Annealing Temperature ◽  
Cold Deformation ◽  
Grain Structure ◽  
Sheet Stamping ◽  
Structural Entropy ◽  
Size Uniformity

Sheet blanks’ structure uniformity determines their ability to sheet stamping. Level of entropy may represent the characteristic of structural uniformity. Structural entropy was received from strain curves recalculation for sheet blanks from aluminium alloys Al-2Mg and Al-6Mg are presented in the work. Stain curves were provided for blanks after cold deformation and annealing at temperatures 250, 350 И 450˚C. Estimation of grain size uniformity was made. Effect of annealing temperature on structural entropy and grain structure uniformity was found. It was shown that annealing temperature increasing leads to structural entropy decreasing. Ununiformity of grain size achieves the minimal values after annealing at temperature 350˚C for both alloys, and then ununiformity grows after annealing at temperature 450˚C.

Getting Oil Pipes High Strength Quenched and Tempered Condition

2018 ◽  
Vol 69 (7) ◽  
pp. 1866-1870
Author(s):  
Carmen Otilia Rusanescu ◽  
Gheorghe Voicu ◽  
Marin Rusanescu ◽  
Sorin Stefan Biris
Keyword(s):  
Heat Treatment ◽  
Laboratory Experiments ◽  
Mechanical Characteristics ◽  
High Strength ◽  
Low Carbon ◽  
Fine Grain ◽  
Strength And Plasticity ◽  
Strength And Plasticity Characteristics

The use of the steel with low carbon and fine grain Cr-Mo type is asked by the necessity to fit high strength and plasticity characteristics. The paper emphasizes the quenched and tempered high strength pipes from groups II, III and IV � API 5 CT obtaining. The laboratory experiments followed the establishment of optimum values of the heat treatment parameters. Saying all these to ensure the obtaining of the mechanical characteristics specific to eachs grade that was to be obtained. Were used microalloyied steels with vanadium and columbium, that refined the structure of improved the materials toughness. The paper is determined hardenability and finishing elements influence the use of grain (V, Nb) on hardenability.

The Effect of Final Annealing Heating Rate on Abnormal Grain Growth in a Fe-3.5%Si Steel

2016 ◽  
Vol 879 ◽  
pp. 350-355
Author(s):  
Fatayalkadri Citrawati ◽  
Md Zakaria Quadir ◽  
Paul Munroe
Keyword(s):  
Grain Size ◽  
Heating Rate ◽  
Grain Growth ◽  
Growth Kinetics ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Rapid Heating ◽  
Secondary Recrystallization ◽  
Recrystallization Annealing ◽  
Final Annealing

In this study the effects of heating rate on the sharpness and size of Goss oriented ({110}<001>) grains during secondary recrystallization annealing at 900 °C was observed. The results show that, at the same annealing temperature, rapid heating of the samples to this temperature generates a higher drag force compared to a slower heating rate (5°C/min). The two groups of samples show different growth kinetics for Goss grains, in which at the longest annealing time, the rapid heating sample exhibits larger maximum Goss grain size compared to the slower heated samples.

Development of Grain Structure and Texture during Annealing in Asymmetrically Rolled AA5754

2004 ◽  
Vol 467-470 ◽  
pp. 381-386 ◽  
Author(s):  
Hai Ou Jin ◽  
David J. Lloyd
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Annealing Temperature ◽  
Rolling Texture ◽  
Deformation Texture ◽  
Grain Structure ◽  
Asymmetric Rolling ◽  
Fine Grain ◽  
Continuous Recrystallization ◽  
Cold Rolling Texture

AA5754 sheet has been processed by asymmetric rolling and the development of grain structure and texture in subsequent annealing studied at 240-500°C. It has been found that asymmetric rolling facilitates the formation of ultra-fine grain structure (1-2µm grain size) by shear strain promoted continuous recrystallization, which is a process of extended recovery and subgrain/grain growth. The ultra-fine grain structure is not thermally stable, and when the annealing temperature or time increases, the grain size eventually grows to its Zener limit. The deformation texture is similar to the typical f.c.c. cold rolling texture but rotated about the transverse direction. Along with the formation of an ultra-fine grain structure and subsequent grain growth, the deformation texture is retained.

Recrystallization and Grain Growth Phenomena in Stainless Steels for Different Thermo-Mechanical Processes

2018 ◽  
Vol 941 ◽  
pp. 135-140 ◽  
Author(s):  
Giuseppe Napoli ◽  
Stefano Grimozzi ◽  
Claudia Rocchi ◽  
Andrea di Schino
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Growth ◽  
Stainless Steels ◽  
Mechanical Characteristics ◽  
Volume Fraction ◽  
Primary Recrystallization ◽  
Drag Effect ◽  
Zener Drag ◽  
Steel Grades

The mechanical properties of steels are strictly connected to chemical composition as well as to microstructural features obtained after thermo-mechanical processing. As a consequence, recrystallization and grain growth are relevant to the mechanical properties of steels, thus suggesting the necessity of mathematical models able to predict the microstructural evolution after thermo-mechanical cycles. In particular, in stainless steel grades, mechanical characteristics, and a proper microstructure with an adequate grain size distribution, are very important in order to achieve the required formability and deep drawing properties for many applications. This paper deals with the study of microstructural changes, such as grain size variations and recrystallized volume fraction in stainless steels during isothermal treatments through the application of a mathematical model, able in general to describe the primary recrystallization and grain growth in metals. The developed model takes into account the recrystallization phenomenon and Zener drag effect. A general continuity equation is proposed describing in continuous way recrystallization and grain growth phenomena without taking into account textures effect. The influence of input parameters is analyzed.

Study on Evolution of Partial Texture of Different Grains during Grain Growth in IF Steels

2010 ◽  
Vol 638-642 ◽  
pp. 2799-2804 ◽  
Author(s):  
W.P. Tong ◽  
W.Y. Chen ◽  
Francis Wagner ◽  
L. Zuo ◽  
J.C. He
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Steel Sample ◽  
Temperature Dependent ◽  
Experiment Data ◽  
Texture Characteristic ◽  
Mean Grain Size ◽  
Cold Rolled

An IF steel sample was cold rolled to a reduction of 80% and subsequently submitted to annealing treatment at 650°C, 710°C and 770°C for various durations, respectively. The grain size and evolution of partial texture of small, medium and large grains were investigated during grain growth. It was found that the growth rate and partial texture characteristic were absolutely distinct at different annealing temperature, both were temperature dependent. At same annealing temperature, partial texture for various annealing time was similar, but its intensity increases with an increment of duration. And the relation between partial texture of different grains assembly and its mean grain size can be expressed by an empirical formula from experiment data.

scholarly journals Effects of recrystallization annealing on mechanical properties of cold-rolled PdNi5 wires

10.30544/136 ◽  
2016 ◽  
Vol 22 (1) ◽  
pp. 17-24
Author(s):  
Aleksandra Ivanović ◽  
Biserka Trumić ◽  
Svetlana Ivanov ◽  
Saša Marjanović ◽  
Silvana Dimitrijević ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Cold Deformation ◽  
Testing Machine ◽  
Recrystallization Temperature ◽  
Time Range ◽  
Recrystallization Annealing ◽  
Deformation Degree ◽  
Cold Rolled

The aim of this investigation was to determine the influence of the recrystallization temperature and recrystallization time on the microstructure and mechanical properties of the PdNi5 alloy subjected to cold deformation in the process of rolling at a constant deformation degree. The samples of PdNi5 alloy were recrystallization annealed within the temperature range of 200-1000ºC and annealing time range of 20-45 min after cold rolling with deformation degree of 97%. The tensile test was carried out using universal material testing machine. The hardness was also measured on the combined device for measuring Vickers and Brinell hardness. Metallographic observations were performed on an optical microscope. The analysis of the results of investigations regarding the microstructural changes and corresponding mechanical properties of cold-rolled PdNi5 strips shows that annealing temperature of 500ºC was sufficient to activate the energy for various recrystallization processes causing a change in the mechanical properties of cold-rolled PdNi5 strips. The annealing time, at constant annealing temperature, almost did not affect a recrystallization temperature and the mechanical properties of the cold-rolled PdNi5 strips.

Effect of Tensile Deformation on the Grain Size of Annealed Grain Non-Oriented Electrical Steel

2009 ◽  
Vol 1243 ◽  
Author(s):  
J. Salinas B. ◽  
A. Salinas
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Annealing Temperature ◽  
Electrical Steel ◽  
Tensile Deformation ◽  
Strain Range ◽  
Final Annealing ◽  
Steel Sheets ◽  
Recrystallized Grain Size ◽  
Type Of Behavior

ABSTRACTAn experimental study on the effect of tensile deformation on recrystallized grain size has been carried out in order to establishing the optimal deformation needed to accelerate grain growth during final annealing of semi-processed non-oriented Si-Al, low C electrical steel sheets. The material is deformed in tension to strains from 3 to 20% and then air-annealed at temperatures between 700 and 900 °C. The results show that the critical deformation for recrystallization (8%) is independent of annealing temperature. However, the critical recrystallized grain size increases with annealing temperature from 160 to 240 μm. After that, the grain size decreases exponentially with increasing deformation. Abnormal grain growth is observed in samples annealed at 700 °C after strains in the range from 7 to 12%. This type of behavior is also observed in specimens annealed at 800 and 900 °C, however, in this case the pre-strain range is expanded to 3–12%. Normal grain growth is observed in samples pre-deformed to strains larger than 12%. In this case, the final grain size after 2 hour anneal is about 55 μm, also independent of annealing temperature. The possible implications of these results on the magnetic properties of these materials are discussed.

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