The effect of pre-heat temperature on the microstructure and abrasive wear properties of laser metal deposited near-eutectic Fe-28Cr-2.9C alloy

摘要: Fe-Cr-C near-eutectic alloys are commonly used in wear resistant parts mining applications, due to their excellent erosion and abrasion resistance. Laser metal deposition is an additive technology that presents opportunities for manufacturing components, as well repairing worn areas of parts. However, hypoeutectic very hard brittle often considered “unweldable” the lack ductility required accommodate thermal stresses. Therefore, controlling key processing parameters, such preheating temperature cooling rate, plays a crucial role achieving crack-free layers with refined microstructure. The aim this study was investigate effect substrate preheat on microstructure properties laser deposited Fe-28Cr-2.9C alloy. were analyzed three different conditions. consisted structure consisting M7C3 carbides + austenite, which has been mostly transformed martensite. Increasing increased carbide size retained austenite matrix, detrimental