The Effect of Intermediate Annealing Condition on Recrystallization Behavior in Continuous Cast Al-Mn Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 1251-1256
Author(s):  
Kenta Suzuki ◽  
Tomohiro Sasaki ◽  
Toshiya Anami
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Tensile Strength ◽  
Rapid Heating ◽  
Salt Bath ◽  
Grain Structure ◽  
Annealing Condition ◽  
Recrystallization Behavior ◽  
Intermediate Annealing ◽  
Continuous Cast

Favorable features such as finer particles and supersaturated solid solution are characterized in continuous casting. In this study, difference of recrystallization behavior was mainly evaluated on two intermediate annealing conditions in continuous cast Al-Mn alloy. One annealing condition was air furnace annealing which corresponds to batch type annealing and is conventionally used to anneal aluminum alloys. Another one was salt bath annealing which simulates CAL type annealing, which is characterized by shorter holding time with rapid heating and cooling. With consideration for application to fin stock in heat exchanger, heat treatment simulating brazing at 600°C was carried out on cold rolled sheets after respective intermediate annealing. After the brazing heat treatment, superior tensile strength and coarser grain structure were attractively obtained with the salt bath intermediate annealed fin. This tensile strength was correlated with much finer particles and more solid solution confirmed after the salt bath intermediate annealing. The coarser grain structure would be brought by changing in recovery and recrystallization behavior during brazing heat treatment.

The Effects of Ni Content and Intermediate Annealing Condition on Recrystallization of Al-Fe-Ni-Si Alloy Fin Stocks

2016 ◽  
Vol 877 ◽  
pp. 166-171
Author(s):  
Kenta Suzuki ◽  
Daisuke Shimosaka ◽  
Tomohiro Sasaki ◽  
Yasuyuki Owada ◽  
Shuhei Kuroiwa ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Heat Exchangers ◽  
Microstructural Analysis ◽  
Salt Bath ◽  
Grain Structure ◽  
Recrystallization Behavior ◽  
Intermediate Annealing ◽  
Annealing Conditions ◽  
Ni Content ◽  
Low Density Area

The effects of Ni content and intermediate annealing conditions on recrystallization behavior during brazing heat treatment of Al–Fe–Ni–Si alloys fin stocks of automotive heat exchangers were studied by means of microstructural analysis. Following brazing heat treatment, coarsening of recrystallized grain structure was observed in both 0.5% Ni and 1.0% Ni fin stocks, which were intermediately annealed in a salt bath. This coarsening was particularly marked in 1.0% Ni fin stocks. The results of the microstructural observations indicated that fine dispersoids were heterogeneously dispersed in 1.0% Ni fin stocks that were annealed at 550°C for 10 s in a salt bath. It was proposed that the preferential recovery and recrystallization during the brazing heat treatment in the low density area of the fine dispersoids contributed to the larger recrystallized gain structure. The coarse recrystallized grains obtained by controlling the salt bath annealing conditions are expected to contribute in improving the properties of Al–Fe–Ni–Si alloy fin stocks of automotive heat exchangers.

scholarly journals Effects of Si and Zr addition on strength and recrystallization behavior of Al-Mn alloy fin stocks for automotive heat exchanger

2020 ◽  
Vol 326 ◽  
pp. 05006
Author(s):  
Daisuke Shimosaka ◽  
Mamoru Ueno
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Heat Exchanger ◽  
The Other ◽  
Grain Structure ◽  
Recrystallization Behavior ◽  
Intermediate Annealing ◽  
Zr Addition ◽  
Grain Structures ◽  
Alloy Heat

For an Al-Mn alloy heat exchanger fin stocks which continuous casting was simulated in, the effects of Si and Zr addition on strength and recrystallized grain structures after brazing heat treatment were investigated. As a result of tensile test, pre-brazed tensile strength was increased with increasing Si and Zr contents in the Al-Mn alloy. On the other hands, Zr addition have a small effect on post-brazed tensile strength regardless of Si contents. This was attributed the dissolution of Al3Zr or (Al,Si)3Zr precipitates during brazing heat treatment. Post-brazed grain structure were refined with increasing Si contents. Meanwhile, Zr addition led to larger post-brazed grain structures. It was found that Al3Zr or (Al,Si)3Zr precipitated during intermediate annealing played to major role in retarding recrystallization during brazing heat treatment.

scholarly journals Effects of Different Solid Solution Temperatures on Microstructure and Mechanical Properties of the AA7075 Alloy After T6 Heat Treatment

2019 ◽  
Vol 38 (2019) ◽  
pp. 892-896 ◽  
Author(s):  
Süleyman Tekeli ◽  
Ijlal Simsek ◽  
Dogan Simsek ◽  
Dursun Ozyurek
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Tensile Strength ◽  
Tensile Tests ◽  
Solution Temperature ◽  
T6 Heat Treatment ◽  
Microstructure And Mechanical Properties ◽  
Different Temperatures

AbstractIn this study, the effect of solid solution temperature on microstructure and mechanical properties of the AA7075 alloy after T6 heat treatment was investigated. Following solid solution at five different temperatures for 2 hours, the AA7075 alloy was quenched and then artificially aged at 120∘C for 24 hours. Hardness measurements, microstructure examinations (SEM+EDS, XRD) and tensile tests were carried out for the alloys. The results showed that the increased solid solution temperature led to formation of precipitates in the microstructures and thus caused higher hardness and tensile strength.

Effect of Heat Treatment on the Structure and Properties of EW75 Magnesium Alloy Plate

2013 ◽  
Vol 747-748 ◽  
pp. 158-165
Author(s):  
Juan Qu ◽  
Kui Zhang ◽  
Ming Long Ma ◽  
Yong Jun Li ◽  
Xing Gang Li
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Tensile Strength ◽  
Solution Process ◽  
Solution Time ◽  
Solution Temperature ◽  
Second Phase ◽  
Alloy Plate ◽  
T6 Heat Treatment ◽  
The Matrix

In this study, Mg-7Gd-5Y-1Nd-0.5Zr alloy (EW75) was produced by melting method and then press-forged into large size plate. The properties of the Mg-7Gd-5Y-1.2Nd-0.5Zr alloy were optimized through T6 heat treatment. The microstructures of alloy were observed by means of optical microscopy (OM), scanning electron microscopy (SEM). Its mechanical properties under different heat treatment conditions were determined by tensile tests. The results indicated that increasing the solid solution temperature and prolonging the solid solution time can both lead to the dissolution of second phase in the alloy back into the matrix. The solid solution temperature affects the dissolution process more than the solid solution time. Grain growth occurred during the solid solution process. The grain size of the matrix enlarges with the increase of solid solution temperature. The tensile test result showed that the tensile strength of the alloy was significantly improved after T6 heat treatment. Its tensile strength in the same direction was nearly 40% up after T6 heat treatment. The analysis shows that T6 heat treatment can effectively eliminate the larger deformed precipitates and beneficial to the formation of hard precipitates, which leads to an improvement in the alloys tensile strength.

Recrystallization Behaviour in Twin-Roll Continuous Cast Al-Fe-Ni Alloy

2006 ◽  
Vol 519-521 ◽  
pp. 1635-1640 ◽  
Author(s):  
Akio Niikura ◽  
Akira Kawahara ◽  
Go Kimura ◽  
Takeyoshi Doko
Keyword(s):  
Strain Level ◽  
Grain Structure ◽  
Subgrain Structure ◽  
Intermediate Annealing ◽  
Continuous Cast ◽  
Rolled Sample ◽  
Fine Dispersion ◽  
Ni Alloy ◽  
Continuous Recrystallization ◽  
Twin Roll

Factors controlling the recrystallization of a continuous cast Al-Fe-Ni alloy were investigated by analyzing microstructure, grain structure, texture, and electron backscattering patterns. The texture of an as-rolled sample heated at 400°C was similar to that of a sample at the reduction ratio of 50% after intermediate annealing at 550°C. The as-rolled samples had a strong (213)[36-4] (S-type) orientation that was changed to a strong (130)[3-12] (QQ-type) orientation by heating at 400°C. This recrystallization looks like continuous recrystallization. Discontinuous recrystallization due to particle-stimulated nucleation is suppressed by the fine dispersion of Al-Fe-Ni-Si particles that form during casing and intermediate annealing, and stabilize the grain and subgrain structure. We think that a course initial grain structure and moderate level of strain level are the important factors promoting continuous recrystallization in this alloy.

scholarly journals Microstructure and Mechanical Characterization of Austempered AISI 1018 Steel

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Muideen Bodude ◽  
Oluwole D Adigun ◽  
Ahmed Ibrahim
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Impact Energy ◽  
Microstructural Analysis ◽  
Salt Bath ◽  
Isothermal Transformation ◽  
Critical Conditions ◽  
Average Value ◽  
Extreme Load ◽  
Bainite Microstructure

AISI 1018 mild steels are widely used for engineering applications in machine components and for structural purposes. These materials suffer mechanical damages especially when used under critical conditions of extreme load. In this study, the effect of austempering heat-treatment on the hardness, tensile strength, impact energy and the microstructure of AISI 1018 steels were evaluated. The steel specimens were subjected to austempering heat-treatment by austenitizing at a temperature of 830°C, maintained at this temperature for a period of 1 hour 30 minutes, before rapidly cooled down in a NaNO3 salt bath maintained at 300°C for isothermal transformation for a further 50 minutes before finally cooled down to room temperature. Microstructural analysis using Scanning Electron Microscope (SEM) shows transformation from ferrite/pearlite to bainite microstructure. The tensile strengths of the specimen increased from 400 MPa to 500 Mpa; hardness increased from an average value of 140Rc to 162Rc; while impact energy increased from 15.6 Joule to 30.6 Joule by the austempering heat-treatment. Keywords—Austempering, hardness, tensile strength, impact energy, microstructure

scholarly journals Effects of cold tandem rolling on microstructures and mechanical properties of TC16 titanium alloy wire for fastener use

2020 ◽  
Vol 321 ◽  
pp. 11086
Author(s):  
SUN Xiaoping ◽  
HOU Fengqi ◽  
YANG Hui ◽  
Wang Kaixuan ◽  
LIU Xianghong
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Tensile Strength ◽  
Titanium Alloy ◽  
Special Requirement ◽  
Technology Application ◽  
Alloy Wire ◽  
Solution Strengthening ◽  
Rolling Technology

High-precision dimension controlling and special requirement of microstructures and mechanical for TC16 Alloy wire was obtained by cold rolling. In this paper, the effects of cold tandem rolling on M and STA mechanical of TC16 Alloy wire were investigated through Comparative study TC16 Alloy wire by cold tandem rolling and hot-draw. The results show that the M state tensile and yield strength of TC16 Alloy wire obtained by cold tandem was lower, while the ductility was higher. And this benefits the subsequent Cold Heading formability. The result of solid solution for TC16 Alloy wire by cold tandem rolling was evidenced, the tensile strength has been increased and the ductility has been reduced more drastically. To break down elongated α of Vertical microstructure ability and drastic machining deformation have significant contributions to the annealed ductility and solution strengthening. It is very positive to TC16 titanium alloy use for fastener of heat treatment strength with the cold tandem rolling technology application.

Tensile Strength Properties of Niobium Alloyed Austempered Ductile Iron on Different Austempering Time

2012 ◽  
Vol 457-458 ◽  
pp. 1155-1158 ◽  
Author(s):  
Bulan Abdullah ◽  
Siti Khadijah Alias ◽  
A. Jaffar ◽  
Abd Amirul Rashid ◽  
M. Haskil ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Ductile Iron ◽  
Salt Bath ◽  
Strength Properties ◽  
Austempered Ductile Iron ◽  
Bath Furnace

This study focused on tensile strength properties inclusive of ultimate tensile strength and elongation values of niobium alloyed ductile iron in as cast and austempered conditions. The tensile specimens were machined according to TS 138 EN 10002-1 standard. Austempering heat treatment was conducted by first undergoing austenitizing process at 900°C before rapidly quenched in salt bath furnace and held at 350°C for 1 hour, 2 hours and 3 hours subsequently. The findings indicated that austempering the samples for 1 hour had resulted in improvement of almost twice of the tensile strength in niobium alloyed ductile iron. Improvement of elongations values were also noted after 1 hour austempering times. Increasing the austempering holding times to 2 hour and 3 hours had resulted in decrement in both tensile strength and elongations values.

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