Fatigue Endurance of Aluminium Casting 7xxx Series as Alternative Material for Organic Rankine Cycle’s Turbine Blade at 180 °C Operation Temperature

Abstract

Organic rankine cycle (ORC) Turbines are very promising for converting heat in low temperatures from 100 to 220 ° C into electrical energy. The use of Fe-25Al-xTi and TiAl alloys as ORC turbine blades encourages the need for development in utilizing lighter but stronger alternative materials. This study analyzed and observed the fatigue resistance of Al-Zn-Mg-Cu alloys as an alternative material by performing chemical composition analysis, hardness test, microstructure test, tensile test, fatigue test, and fractography observation. The results show that there is reduction in mechanical properties and fatigue resistance in artificial aged specimens. This is due to the deployment of precipitate which is a decomposed phase causing a decrease in mechanical properties and fatigue resistance in heat treated specimens.

THE EFFECT OF ANNEALING AND COLD FORGING ON MICROSTRUCTURE AND HARDNESS PROPERTIES OF Al-SiC COMPOSITE : A PRELIMINARY STUDY

“…One type of aluminium alloy that is commonly used in AMMCs is the 7xxx series aluminium alloy. 7xxx series aluminium alloys have wide application such as turbine components [1], automotive [2], high-speed rail [3], aerospace [4], and even military [5] because of their superior properties, namely high strength, high fatigue resistance and lightweight. The lightweight aluminium material can reduce the carbon footprint by reducing fuel consumption in vehicles to avoid global warming.…”