High Temperature Strength of Cast Heat Resisting Aluminum Alloy for Combustion Engine Piston
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概要
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Heat resisting cast metal AC8A has been widely used as the material of piston of reciprocating internal combustion engine. Recently, since internal combustion engine with high effciency has a tendency to be operated at a higher temperature, the heat resisting properties of its materials have become very important problems. In this work, the tensile behavior of AC8A at elevated temperature was studied experimentally to elucidate the elemental process of the occurrence and the propagation of thermal crack. The tensile tests were performed at temperatures from room temperature to liquidus and at different strain rates varied from 10^-4 to 10^-1 per sec. The results obtained are as follows : (1) The change of tensile strength at high temperature can be described by four ranges of temperature. Range I is the high strength range from room temperature to about 300℃. Range II is the sharply drop strength range from 300℃ to 450℃. Range III is the low strength range from 450℃ to 535℃. Range IV is the liquid and solid coexisting range from 535℃ to liquidus. (2) The stress and strain relations are shown as follows. At range I, the stress rises steeply with strain and the failure occurs as the stress in rising. At range II, the plastic deformation range starts to increase with temperature. The peak stress appears just at the middle point within the homogeneous plastic deformation range. And the strain hardening decreases with temperature. At range III, the recovery action starts to counter against strain hardening, so mechanically the structure becomes homogeneous. Therefore the homogeneity of plastic deformation sustains very long without necking. At range IV, the local parts of the Structure start to melt. So the strange stress-strain curve appears. (3) The elongation and the reduction of area at range I are very small because of its brittleness, at range II increase gradually with temperature, at range III show the highest, at range IV fall to lower value.
- 東海大学の論文
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