Affiliation:
1. Central Research Institute of Baoshan Iron & Steel Co., Ltd. Shanghai 201900 China
2. School of Mechanical and Mining Engineering The University of Queensland St Lucia QLD 4072 Australia
3. Advanced Mechanics and Materials Pacific Engineering Systems International 20D Grose St Glebe NSW 2037 Australia
Abstract
The hot tearing susceptibility of Al–Zn binary alloys with solute contents of Al–0.5%Zn, Al–1%Zn, Al–2%Zn, and Al–4%Zn, with all compositions being in wt%, is investigated through physical experiments and numerical simulation. The temperature at the hot spot, the designed critical point for hot tearing, and the load at the end of the test bar are measured and compared with the simulation results. The test samples with 0.5 and 1.0% Zn show hot tears while those with 2.0 and 4.0% Zn have no sign of such tearing. The correlation between solid fraction, strain, stress, and hot tearing indicator is revealed using the simulation results of the Al–1%Zn and Al–4%Zn alloys. Just before solidification, the Al–1%Zn alloy is found to have not only a much higher strain rate at the hot spot of the test bar than that of the Al–4%Zn alloy, but also a higher strain gradient along the longitudinal direction. It is believed that both the high strain rate and high strain gradient are attributable to the formation of hot tears in the Al–1%Zn alloy.
Subject
Condensed Matter Physics,General Materials Science