| 题名: | Low-cycle fatigue properties and life prediction of Al-Si piston alloy at elevated temperature |
| 作者: | Wang, M.; Pang, J. C.; Li, S. X.; Zhang, Z. F. |
| 发表日期: | 2017-9-17 |
| 摘要: | The influences of temperature on the microstructure evolution, tensile properties, especially low-cycle fatigue (LCF) behaviors and damage mechanisms of Al-Si piston alloy have been investigated in this paper. The results show that the alloy exhibits cyclic softening at high-temperature. Fatigue cracks usually initiate from primary silicon phase and preferentially grow along particles in a slightly zigzag path at relatively low temperature. With temperature increasing, however, the ductile tearing fracture through micro-cracks can be found. In order to evaluate the fatigue life, considering the temperature and loading conditions, a comprehensive 3-parameter model based on hysteresis energy has been proposed; at a constant temperature the fatigue life can be controlled by two parameters, i.e., the intrinsic fatigue toughness W-0 (the resistance to crack propagation) and the fatigue cracking exponent beta (the resistance to fatigue cracking), which dominate the LCF damage mechanisms (from fatigue-induced particle cracking to rapid fatigue crack growth). For the current Al-Si alloy, the combined effect of W-0, beta and temperature T can lead to an optimal fatigue life at a critical temperature. This model provides a new clue for optimizing and designing the high-temperature materials. |
| 刊名: | ELSEVIER SCIENCE SA |
| Appears in Collections: | 中国科学院金属研究所_期刊论文
|
Files in This Item:
There are no files associated with this item.
|
| Recommended Citation: | |
Wang, M.,Pang, J. C.,Li, S. X.,et al. Low-cycle Fatigue Properties And Life Prediction Of Al-si Piston Alloy At Elevated Temperature[J]. Elsevier Science Sa,2017,704:480-492.
|
|
|
