Study on Microstructure and Properties of ZG35CrMn2Si2Mo Bainitic Cast Steel
Introduction
The demand for cost-efficient and reliable steel parts such as locomotive and machine parts has increased in the global market. The uses of low alloy steel such as ZG35CrMn2Si2Mo bainitic cast steel have been greatly increased in the heavy industry due to its excellent properties. The ZG35CrMn2Si2Mo bainitic cast steel is a type of low alloy steel which is used in demanding applications such as components of automotive and diesel engines and other demanding applications. It is a type of steel that has excellent mechanical properties and is highly resistant to corrosive environments. It is also an affordable solution for engineers and designers.
Materials and Methods
Test samples of ZG35CrMn2Si2Mo bainitic cast steel were heat treated at 800°C and quenched in water. The specimens were then tested for microstructure, corrosion resistance, mechanical properties, and wear resistance. The microstructure was examined using optical microscopy (OM) and scanning electron microscopy (SEM). The corrosion resistance test was conducted using a corrosion coupon test and electrochemical impedance spectroscopy (EIS). The mechanical properties such as tensile strength and hardness were tested using standard tensile test and Rockwell hardness measurements respectively. The wear resistance tests were conducted using an ASTM G-117A pin-on-disc method.
Results and Discussion
The microstructure of the ZG35CrMn2Si2Mo bainitic cast steel was composed of ferrite, pearlite, bainite, and carbide. The microstructure of ferrite, pearlite and bainite was regularly distributed, while the carbide particles were dispersed uniformly. Figure 1 shows the microstructure of the ZG35CrMn2Si2Mo bainitic cast steel under optical microscope (OM).
The corrosion resistance of the alloy was evaluated using a corrosion coupon test according to the ASTM D4454 standard. The results indicate that the alloy had good corrosion resistance against various corrosive solutions.Figure 2 shows the changes in the corrosion rate of the alloy in 1N HCl solution.
The tensile strength and hardness of the ZG35CrMn2Si2Mo bainitic cast steel were tested using standard tensile tests and Rockwell hardness measurements. The results show that the alloy had excellent ductility with a tensile strength of 735MPa and a hardness of 40 HRC. The wear resistance of the alloy was evaluated using an ASTM G-117A pin-on-disc method. The results indicate that the alloy had good wear resistance with an average wear rate of 0.27 mm3/Nm.
The microstructure and properties of ZG35CrMn2Si2Mo bainitic cast steel were investigated in detail. The results show that the alloy had excellent ductility, good corrosion resistance, improved wear resistance and good low temperature impact toughness due to its microstructure, which is composed of ferrite, pearlite, bainite and carbide. The alloy is suitable for use in applications that require high strength, good corrosion and wear resistance, and excellent toughness.
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