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Specimens of 18 Ni (250) maraging steel were solution treated and aged at the temperatures of 480® C, 590® C, and 650® C for varying times up to a maximum of 24 hours. Solution annealed specimens were also cold rolled to varying amounts. The erosion behavior of these specimens was studied in a sand-blast type test rig. The tests were conducted under ambient conditions with 125 ym angular silicon carbide particles impacted with a velocity of 50 m/s and at an angle of 30® to the specimen surface. The variation of erosion has been related to the microstructural changes during aging which involve precipitation, reversion of austenite, and precipitate particle growth. It has also been studied with respect to the mechanical properties. It was found that the erosion rate depends both upon the hardness and ductility. The erosion rate varies directly with hardness when ductility remains constant and it varies inversely with the square of percent area reduction when hardness remains constant. Scanning electron microscopy of the eroded surfaces and debris revealed that erosion was accompanied by a large amount of plastic deformation and the eroded particles were in the form of small flakes. The flakes were detached because of a combination of cutting, plowing, and crack propagation mechanisms.

Effect of microstructure and mechanical properties on the erosion of 18 Ni (250) maraging steel and aluminum alloys