Low Cycle Fatigue Behavior of A356 Aluminum Alloy Prepared by Squeeze Casting and by Gravity Die Casting

Zheng Chengkun; Lou Zhaohui; Cheng Pei; Fan Jianlei; Lin Bo; Zhang Weiwen

doi:10.15980/j.tzzz.2013.08.020

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Low Cycle Fatigue Behavior of A356 Aluminum Alloy Prepared by Squeeze Casting and by Gravity Die Casting
Vol. 33, Issue 8, Pages: 735-739(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.08.020

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[1]郑成坤,娄照辉,程佩,范建磊,林波,张卫文.挤压铸造和重力铸造A356铝合金低周疲劳行为研究[J].特种铸造及有色合金,2013,33(08):735-739.

Zheng Chengkun, Lou Zhaohui, Cheng Pei, et al. Low Cycle Fatigue Behavior of A356 Aluminum Alloy Prepared by Squeeze Casting and by Gravity Die Casting. [J]. Special Casting & Nonferrous Alloys 33(8):735-739(2013)
[1]郑成坤,娄照辉,程佩,范建磊,林波,张卫文.挤压铸造和重力铸造A356铝合金低周疲劳行为研究[J].特种铸造及有色合金,2013,33(08):735-739. DOI： 10.15980/j.tzzz.2013.08.020.

Zheng Chengkun, Lou Zhaohui, Cheng Pei, et al. Low Cycle Fatigue Behavior of A356 Aluminum Alloy Prepared by Squeeze Casting and by Gravity Die Casting. [J]. Special Casting & Nonferrous Alloys 33(8):735-739(2013) DOI： 10.15980/j.tzzz.2013.08.020.

摘要

通过低周疲劳试验

结合金相分析、静态力学性能测试、SEM等手段

对比研究了重力铸造和挤压铸造A356铝合金的低周疲劳行为。结果表明

两种制备工艺下的合金都表现为明显的持续循环硬化行为

但挤压铸造工艺下

压力使针状Si更加细小弥散

二次枝晶减小

缩松、气孔等铸造缺陷减少

组织致密度提高

使得循环应力响应曲线的最大值增加

且循环变形抗力和低周疲劳寿命提高。两种工艺下合金的循环塑性应变能密度都随着循环周次的增加而减小

在相同应变幅条件下

挤压铸造合金的循环周次增加

消耗的总能量增加。

Abstract

The low-cycle fatigue behavior of squeeze casting and gravity casting A356 alloys was investigated by the strain-controlled fatigue experiment

tensile testing

optical microscope（OM）

scanning electronic microscope（SEM）.The results show that the A356 alloy prepared exhibits cyclic strain hardening in both processing methods.With pressure

as a result of the smaller and dispersive needle-like silicon particles and the decrease of SDAS as well as elimination of the shrinkage and porosity in the squeeze casting alloy parts

the maximum values in cyclic stress response curve

the cyclic deformation resistance and low cycle fatigue life of the A356 alloy are increased.The plastic cyclic strain energy density is decreased with the increase of cyclic time in the alloy prepared by two kinds of methods.However

the cyclic time and the total energy consumption of the squeeze cast alloy are increased at the same strain amplitude condition comparing with the gravity cast alloy.