Mechanical and Fatigue behavior of G22NiMoCr5-6 and G18NiMoCr3-6 used in heavy-duty crawler track plates

Abstract

Abstract G22NiMoCr5-6 and G18NiMoCr3-6 steels are commonly used in the manufacturing of crawler track plates of heavy-duty equipment due to their enhanced mechanical properties which allow them to be suitable for this particular application. This research aims to investigate the mechanical and fatigue behavior of both material grades to evaluate their performance in the manufacturing of heavy-duty crawler track plates. In the present work, experimental investigations were carried out including chemical composition, tensile, hardness, Charpy impact, and low-cycle fatigue tests. Also, metallographic examination was conducted to show the microstructure of both materials. Based on the experimental analysis results, the bainitic structure of G18NiMoCr3-6 was found to have longer fatigue life and higher toughness than the tempered-martensitic structure of G22NiMoCr5-6 which qualifies G18NiMoCr3-6 to be more suitable for manufacturing of heavy-duty crawler track plates than G22NiMoCr5-6 steel.

Keywords

• G22NiMoCr5-6
• G18NiMoCr3-6
• Mechanical testing
• Microstructure
• Fatigue
• Crawler track plates