Effect of Post Weld Heat Treatment on High-temperature Wear Resistance of Martensitic Stainless Steel AWS A5.9 ER420 Weldment by GMAW Process
Keywords:Hardfacing, ER420, Post Weld Heat Treatment, Wear Resistance
This research studies the effect of post weld heat treatment (PWHT) on microstructure, mechanical properties, and high-temperature wear resistance of AWS A5.9 ER420 deposited filler metal. The gas metal arc welding process (GMAW) was performed by using the welding parameters: current range 190-230 A., Arc voltage 21.5 V, and welding speed 6.4 mm/s. After welding, the specimens were carried out into the PWHT at 500 °C and 700 °C for 2 hrs. According to ASTM G99, the abrasive wear test was performed at room temperature, 100°C, 200°C, and 300°C respectively. The experimental result shows that the hardness of weld metal increased when the PWHT at 500°C was performed, conducting a decrease in wear rate. On the contrary, the wear rate increases when the hardness of deposited metal reduces caused by PWHT at 700°C. However, it was found that the high-temperature wear rate decreases when the test temperature increase due to the modification of mechanical properties and oxide formation of iron and chromium on the deposited metal surface.
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