Research Information System
PPM 2015 International Porous and Powder Materials Symposium and Exhibition, İzmir, Turkey, 15 - 18 September 2015, pp.472-477
Heat treatment of powder metallurgy parts is often used in order to meet requirements on high hardness and other mechanical properties. However, sintered steels behave different compared to wrought steel due to its porous structure. To widen the use of sintered steel, a better understanding of the influence of heat treatment conditions on the properties of sintered steel is required. In this study selected Cu-Ni-Mo alloyed sintered steel, given to be used for different processing routes in heat treatment. Low alloyed steel commercially known as Distaloy AB gives good performance already after sintering but various heat treatment operations can further enhance performance. This study primarily concerns the role of heat treatment processes which influences behaviour of sintered steel. Sintering was performed at 1120 °C for 30 minutes under cracked ammonia atmosphere. The selected heat treatment processes were induction hardening, carburizing, carburizing and tempering, carbonitriding, carbonitriding and tempering. The specimens were metallographically tested before and after heat treatments, and the results discussed in light of the surface hardness of the compacts. This study can also be a reference in how to processing route in order to obtain desired performance based on available process equipment.
Keywords: Sintered steel, Heat treatment, Surface hardness, Microstructure characterisation.