A hot tearing criterion based on solidification microstructure in cast alloys

2021 ◽  
Author(s):  
Bo Hu ◽  
Zixin Li ◽  
Dejiang Li ◽  
Tao Ying ◽  
Xiaoqin Zeng ◽  
...  
Keyword(s):  
Hot Tearing ◽  
Solidification Microstructure ◽  
Cast Alloys

scholarly journals Residual Stresses of the As-Cast Mg-xCa Alloys with Hot Sprues by Neutron Diffraction

2014 ◽  
Vol 996 ◽  
pp. 592-597
Author(s):  
Jiang Feng Song ◽  
Yuan Ding Huang ◽  
Karl Ulrich Kainer ◽  
Wei Min Gan ◽  
Norbert Hort
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Hot Tearing ◽  
Cast Alloys ◽  
Hot Tearing Susceptibility

Residual stresses in Mg-xCa (0.5 wt. % and 1.0 wt. %) cast alloys were investigated by neutron diffraction using a mould with two preheating temperatures of 250 °C and 450 °C. Results show that the increase of Ca content decreases the residual stress in the hot sprue region. These results are quite in agreement with those obtained by the measurement of hot tearing susceptibility, which shows the increment in Ca content improves the castability of Mg-Ca alloys.

Characterisation of hot tearing in Al cast alloys: methodology and procedures

2011 ◽  
Vol 24 (2) ◽  
pp. 88-95 ◽  
Author(s):  
S Li ◽  
K Sadayappan ◽  
D Apelian
Keyword(s):  
Hot Tearing ◽  
Cast Alloys

The Formation of the Solidification Microstructure from Liquid Metal in Industrial Processes

2017 ◽  
Vol 884 ◽  
pp. 115-131 ◽  
Author(s):  
Maria Rita Ridolfi
Keyword(s):  
Fluid Dynamics ◽  
Liquid Metal ◽  
Mass Transport ◽  
Solidification Process ◽  
Volume Averaging ◽  
Hot Tearing ◽  
Solidification Microstructure ◽  
Interface Evolution ◽  
Solidification Processes ◽  
Complex Phenomena

This paper focuses on the role played by the liquid metal management on the solidification microstructure in industrial solidification processes. In particular attention is paid to the elimination of solidification defects by governing the microstructure evolution through fluid-dynamics and heat and mass transport in the liquid. The formation of hot tearing and gas porosities as well as columnar and equiaxed microstructures and micro and macro segregation are analyzed to explain how the liquid management is used to avoid defects. Examples on continuous casting and welding are also included.A very powerful tool for dealing with the complex phenomena associated with the solidification process is numerical modeling. Its increasingly growing use contemplates fluid-dynamics of the liquid phase, mass transport of solutes and solid-liquid interface evolution. Models using phase field and volume-averaging techniques, as well as models integrating multi-physics and multi-scale phenomena, are described as their use is taking on increasing importance in the design of solidification processes.

Microstructure and Phase Composition of Al-Ce-Cu Alloys in the Al-Rich Corner

2006 ◽  
Vol 519-521 ◽  
pp. 395-400 ◽  
Author(s):  
Nikolay A. Belov ◽  
A.V. Khvan ◽  
A.N. Alabin
Keyword(s):  
Cross Sections ◽  
Eutectic Reaction ◽  
Ternary Eutectic ◽  
Hot Tearing ◽  
X Ray Diffraction ◽  
Radial Cross Section ◽  
Casting Alloys ◽  
Fine Microstructure ◽  
Binary Eutectic ◽  
Cast Alloys

Al–Cu–Ce alloys have been studied in the Al-rich corner using the microstructural (LM and SEM), thermal (direct and DSC), X-ray diffraction and electron probe microanalysis techniques. Three cross-sections were of particular interest: (a) at 20%Cu (up to 12.5%Ce), (b) at 14%Cu (up to 10%Cu) and (c) at a ratio Cu:Ce=2:1 (up to 10%Ce and 20%Cu). As-cast alloys and those after annealing at 540 and 590°C were studied. Boundaries of appearance of the Al8CeCu4 primary crystals and ternary eutectic involving the phase Al2Cu were determined. The radial cross section (Cu:Ce=2:1) is supposed to be of quasibinary type as ternary eutectic does not form. The temperature and concentrations of the eutectic reaction L–(Al)+CeCu4Al8 were found to be 610°C, 14%Cu and 7%Ce. This binary eutectic has fine microstructure and is capable to fragmentation and spheroidization during heating. The paper considers possibility of using the Al–Cu–Ce system for developing novel Al casting alloys with significantly improved casting properties (hot tearing and fluidity) in comparison with 2xx commercial alloys.

A New Criterion for Prediction of Hot Tearing Susceptibility of Cast Alloys

2014 ◽  
Vol 45 (9) ◽  
pp. 3699-3702 ◽  
Author(s):  
Mohamad Reza Nasresfahani ◽  
Behzad Niroumand
Keyword(s):  
Hot Tearing ◽  
Cast Alloys ◽  
New Criterion ◽  
Hot Tearing Susceptibility

scholarly journals Microstructure and Tensile Properties of the Mg-6Zn-4Al-xSn Die Cast Magnesium Alloy

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 113
Author(s):  
Jin Zhou ◽  
Hamid Jafari Nodooshan ◽  
Dejiang Li ◽  
Xiaoqin Zeng ◽  
Wenjiang Ding
Keyword(s):  
Tensile Properties ◽  
Hot Tearing ◽  
Age Hardening ◽  
Peak Hardness ◽  
Dendrite Structure ◽  
Die Cast ◽  
Cast Alloys ◽  
Peak Aged ◽  
Cast Magnesium ◽  
Hot Tearing Susceptibility

The effect of various Sn contents (1–2 wt. %) on the microstructure, age hardening response, and tensile and casting properties of the high-pressure die cast Mg-6Zn-4Al alloy were studied. All as-cast alloys consisted of α-Mg and icosahedral quasi-crystalline phase; and the addition of 2% Sn caused the formation of Mg2Sn phases. Dendrite structure and eutectic phases were observably refined by Sn addition. The hot tearing susceptibility of the die cast Mg-6Zn-4Al alloy prominently decreased with increasing Sn addition. During T6 heat treatment, Sn addition did not obviously affect the time to reach peak hardness, but significantly enhanced the age hardening response and improved the strength of alloys under peak-aged conditions. Compared to single aging, double aging resulted in the higher density of finer β1′ and β2′ precipitates. The double aged Mg-6Zn-4Al-1Sn alloy offered the optimum tensile properties among all conditions. The yield strength, ultimate tensile strength, and elongation were 209 MPa, 305 MPa, and 4.3%, respectively.

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