Continuous Strip Casting, Microstructure and Performance of Ag-Cu Brazing Alloy

2006 ◽  
Vol 116-117 ◽  
pp. 750-753 ◽  
Author(s):  
Kee Ahn Lee ◽  
Sung Jun Kim ◽  
Young Mo Kim ◽  
Moon Chul Kim
Keyword(s):  
Mechanical Properties ◽  
Hardness Test ◽  
Casting Process ◽  
Strip Casting ◽  
Thin Strip ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
And Performance ◽  
Twin Roll ◽  
Continuous Strip

This study sought to examine the suitability of the continuous strip casting process as a new fabrication method for the Ag-Cu brazing alloy. Several continuous strip casting processes such as planar flow casting, melt dragging, and twin roll strip casting were applied to the manufacture of the Ag-32%Cu strip. In particular, twin roll strip casting was found to realize the best strip shaping ability and microstructural homogeneity. The effect of aging heat treatment on the microstructure and mechanical properties of a Ag-Cu strip was also investigated through tensile test, hardness test, X-ray diffraction (XRD), scanning electron microscopic (SEM) observations, and electron probe microanalysis (EPMA). Tensile results showed gradually decreasing strengths and simultaneously increasing elongation with longer aging time. An appropriate TS strength of 283 MPa and a significantly enhanced plasticity of 41% were realized with aging condition of 670oC/2hrs. Finally, twin-rolled strips 1 mm thick could be cold-rolled to a very thin strip (80~100 μm thickness). The microstructural evolution and crystalline morphologies of Ag-Cu metastable strips were also investigated and related to the mechanical properties.

405 Continuous strip casting of copper alloy by vertical twin roll casting process

2015 ◽  
Vol 2015.23 (0) ◽  
pp. 137-138
Author(s):  
Tomohisa TAKADA ◽  
Fumiya YAMANO ◽  
Yuki AKAIKE ◽  
Yoshitaka SATO ◽  
Masaru FUJITA ◽  
...  
Keyword(s):  
Copper Alloy ◽  
Casting Process ◽  
Strip Casting ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll ◽  
Continuous Strip

Development of Strip Casting Process for Electrolytic Tough Pitch Copper

2005 ◽  
Vol 486-487 ◽  
pp. 456-459 ◽  
Author(s):  
Shae K. Kim ◽  
Hoon Cho ◽  
Jin Kyu Lee ◽  
Won Yong Kim ◽  
Hyung Ho Jo
Keyword(s):  
Mechanical Properties ◽  
Oxygen Content ◽  
Process Parameters ◽  
Microstructure Evolution ◽  
High Purity ◽  
Casting Process ◽  
Strip Casting ◽  
Controlled Atmosphere ◽  
Reactive Metal ◽  
Twin Roll

The aim of this study is to report results of initial trials involving the strip casting process for ETPC (Electrolytic Tough Pitch Copper) and to investigate the effect of process parameters on the chemistry, microstructure evolution and mechanical properties of ETPC. A vertical twin roll strip caster used in this research was designed for manufacturing high-purity and/or reactive metal strips with a system for controlled atmosphere ranging from 103 to 10-3torr. It is expected that oxygen content can be reduced as low as 0.001wt% in as-cast strip.

Analysis of Casting Roll Temperature Field during Twin-Roll Thin Strip Casting

2008 ◽  
Vol 32 ◽  
pp. 169-172 ◽  
Author(s):  
Xiao Ming Zhang ◽  
Zheng Yi Jiang ◽  
Hei Jie Li ◽  
Z. Fan ◽  
Xiang Hua Liu ◽  
...  
Keyword(s):  
Temperature Field ◽  
Thermal Deformation ◽  
Casting Process ◽  
Processing Parameters ◽  
Strip Casting ◽  
Thin Strip ◽  
Surface Cracks ◽  
Roll Temperature ◽  
Roll Casting ◽  
Twin Roll

In twin-roll strip casting process, the temperature variation of casting roll can result in roll thermal stress and fatigue. It not only affects the thermal deformation of casting roll and the generation of the roll surface cracks significantly, but also influences the surface quality, shape and profile of the produced strip, and the service life of the casting roll. In this paper, a 3D coupling thermal-flow finite element modelling has been conducted. For twin-roll casting of stainless steel, the influences of the casting speed and liquid level in molten pool on the temperature field of casting roll have been simulated and discussed. The developed model is very helpful in optimising the processing parameters and the design of casting roll during twin-roll thin strip casting.

New Processing Technology of Twin Roll Strip Casting of AZ31B Magnesium Strip

2005 ◽  
Vol 488-489 ◽  
pp. 615-618 ◽  
Author(s):  
Hong Shuang Di ◽  
Yong Lin Li ◽  
Zhong-liang Ning ◽  
Zheng Li ◽  
Xiang Hua Liu ◽  
...  
Keyword(s):  
Solidification Process ◽  
Casting Process ◽  
Thin Strip ◽  
X Ray Diffraction ◽  
Cast State ◽  
Mg17al12 Phase ◽  
New Processing ◽  
Az31b Alloy ◽  
Cast Magnesium ◽  
Twin Roll

In order to improve the poor workability and solve the problem of difficult roughing rolling of magnesium billet, the twin roll strip castor (TRSC) was used for the manufacture of magnesium thin strip directly from its molten metal. Since the cooling rates achieved by TRSC casting process are in the range of five hundred to several thousands of degrees per second and the strip is formed under the pressure, therefore, this near- rapid solidification process can leads to homogeneity of microstructures, refined grain size and increased solid solubility. The experiments were carried out on the existing equipments at State Key Laboratory of Rolling and Automation (RAL), Northeastern University. Strip samples 200~350 mm wide and 1.5~3.5 mm thick have been successfully cast in standard AZ31B alloy. The surface of the as cast magnesium strip was smooth and the edge was tidy. The microstructure analysis of the as cast magnesium strip showed that the gain size was much refined compared to that of ingot samples, and there was no segregation in the strip. The tensile strength of the strip in the cast state was about 220 MPa. The as cast magnesium strips were cold rolled directly on a two-high rolling mill, the total reduction up to 40% can be reached. X- ray diffraction result showed that the main phase in the as cast state AZ31B magnesium strip was a (Mg), the g (Mg17Al12) phase existing in the conventional wrought magnesium AZ31B sheet was vanished, therefore, the ductility of the strip increased.

Experimental Study on the Distribution of Heat Flux along Contact Arc in Twin-Roll Continuous Strip Casting

2016 ◽  
Vol 693 ◽  
pp. 761-766 ◽  
Author(s):  
Guang Ming Zhu ◽  
C. Zhang ◽  
P.G. Xu ◽  
G.C. Bai
Keyword(s):  
Heat Flux ◽  
Molten Metal ◽  
Casting Process ◽  
Strip Casting ◽  
Pouring Temperature ◽  
Interfacial Heat Flux ◽  
Twin Roll ◽  
Contact Arc ◽  
Continuous Strip

Heat flux between molten metal and casting rolls plays a key role in improving the quality of the strip, studying on the interfacial heat flux has very important theoretical significance and practical value. According to the contact form and the heat flux characteristics of molten metal and casting rolls in twin-roll strip casting process, a set of measuring equipments has been developed, which are used to measure the heat flow of the interface between the molten metal and solid, and a relevant software system has been exploited to acquire and analyze the experiment data. Using the method of combining experimental and numerical computation, we analyze the influence of pouring temperature on the contact interface heat flux. The experimental results show that the higher the pouring temperature , the greater the summit of heat flux density and the shorter time to the summit heat flux are, but when the pouring temperature reaches a certain critical value, the summit of heat flux will decrease with the increase of pouring temperature.

Micro-Hardness and Morphology of LDPE Influenced by Beta Radiation

2014 ◽  
Vol 606 ◽  
pp. 253-256 ◽  
Author(s):  
Martin Ovsik ◽  
Petr Kratky ◽  
David Manas ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hardness Test ◽  
Polymer Materials ◽  
Beta Radiation ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Depth Sensing ◽  
Surface Layers ◽  
Hardness Values ◽  
Different Doses

This article deals with the influence of different doses of Beta radiation to the structure and mico-mechanical properties of Low-density polyethylene (LDPE). Hard surface layers of polymer materials, especially LDPE, can be formed by radiation cross-linking by β radiation with doses of 33, 66 and 99 kGy. Material properties created by β radiation are measured by micro-hardness test using the DSI method (Depth Sensing Indentation). Individual radiation doses caused structural and micro-mechanical changes which have a significant effect on the final properties of the LDPE tested. The highest values of micro-mechanical properties were reached at radiation dose of 66 and 99 kGy, when the micro-hardness values increased by about 21%. The changes were examined and confirmed by X-ray diffraction.

scholarly journals Effect of Oscillation Parameters to Flow Field in the Pool during the Oscillating Twin-Roll Strip Casting Process

2018 ◽  
Vol 31 (1) ◽  
Author(s):  
Zhi-Qiang Xu ◽  
Zhe-Ru Meng ◽  
Shun-Hui Xue ◽  
De-Quan Zhang ◽  
Feng-Shan Du
Keyword(s):  
Flow Field ◽  
Casting Process ◽  
Strip Casting ◽  
Twin Roll
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