Demonstration of an endurance limit in cast 319 aluminum

Abstract

An investigation of the fatigue properties of cast W319-T7, an Al-Si-Cu alloy used in automotive engine components, was conducted using ultrasonic testing equipment with operating frequencies of 20 kHz. The stress-life (S-N) behavior at room temperature was determined for three solidification conditions of this alloy, where stresses for fatigue lives ranging from 10 5 to 10 9 cycles were determined. The results are compared to fatigue data acquired using servohydraulic equipment operating at 40 Hz. No influence of loading frequency has been observed. A discrete endurance limit is indicated for each of the three solidification conditions of W319-T7. The scientific and practical implications of this result are discussed. A material model presented previously is modified by introducing a crack growth threshold condition in order to predict the observed endurance limits. The model is shown to effectively predict the influence of solidification time on the fatigue properties of W319-T7.

High cycle fatigue strength of permanent mold and rheocast aluminum 357 alloy

“…Casting defects have a significant influence on the alloy fatigue strength [3][4][5][6][7]. The defect content, size and nature is known to be influenced by the casting process and the casting conditions that consequently have an effect on the alloy fatigue strength [8][9][10]. For example, hot isostatic pressing significantly improves the cast alloy fatigue life because it closes or suppresses volumetric defects such as shrinkage cavities and gas pores [6].…”

Investigation of the Tribological Behavior of Eutectic Al-Si Casting Alloy

“…The main characterristics of Al-Si alloys used in vehicles are light weight, forming and fabrication, high strength to weight ratio, resistance to corrosion, recyclability, heat the conductivity and reflectance [1]. This has created the need to understand tribological properties of eutectic alloys Al-Si at low load conditions, mimicking the evolution during normal operation of conditions [2][3][4]. To understand roughness and the coefficient of friction it is better to know effect on roughness, through contact between surfaces and leads to deformity, causing economic loss [5][6][7].…”

Investigation of the Tribological Behavior of Eutectic Al-Si Casting Alloy

“…The main characteristics of Al-Si alloys used in vehicles are light weight, forming and fabrication, high strength to weight ratio, resistance to corrosion, recyclability, heat the conductivity and reflectance [1]. This has created the need to understand tribological properties of eutectic alloys Al-Si at low load conditions, mimicking the evolution during normal operation of conditions [2][3][4]. To understand roughness and the coefficient of friction it is better to know effect on roughness, through contact between surfaces and leads to deformity, causing economic loss [5][6][7].…”