Thermo-mechanical Fatigue Behavior of Al-Si-Cu-Mg Casting Alloy

H. Ikuno, Shogo Iwanaga, Y. Awano
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引用次数: 4

Abstract

This paper describes the thermo-mechanical fatigue behavior of Al-Si-Cu-Mg casting alloy. The alloy is widely used for cylinder heads and pistons of automobile engines. Repeated cycling between driving and resting, or low-power and high-power driving cause thermal cycling in the engine materials. The thermo-mechanical fatigue property is therefore very important to develop high-performance engines. This study aims to characterize the cyclic stress-strain behavior of this alloy and to clarify the factors dominating the fracture life. Results obtained are : (1) The stress-strain behavior changes remarkably during thermal cycling. Cyclic hardening and cycling softening occur in the higher and lower strain ranges, respectively. (2) A thermo-mechanical fatigue fracture limit diagram is obtained by connecting fracture points on the inelastic strain range - number of cycles relationship. (3) Consequently, in 10 3 - 10 4 cycles, it is considered that poor ductility and inelastic strain increase due to overaging dominate the thermo-mechanical fatigue life of the alloy.
Al-Si-Cu-Mg铸造合金的热机械疲劳行为
本文描述了Al-Si-Cu-Mg铸造合金的热机械疲劳行为。该合金广泛用于汽车发动机的气缸盖和活塞。在行驶和休息之间,或低功率和高功率之间的反复循环导致发动机材料的热循环。因此,热机械疲劳性能对高性能发动机的研制非常重要。本研究旨在表征该合金的循环应力-应变行为,并阐明影响断裂寿命的因素。结果表明:(1)热循环过程中应力-应变行为发生显著变化。循环硬化和循环软化分别发生在高应变范围和低应变范围。(2)通过连接非弹性应变范围-循环次数关系上的断裂点,得到了热-机械疲劳断裂极限图。(3)在103 ~ 104次循环中,合金的热-机械疲劳寿命主要受延性差和过时效引起的非弹性应变增加的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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