Crushing or wear part having a localized composite wear zone

A crushing or wear part comprising:

• an un-reinforced manganese steel alloy body;
• and
• at least one in-situ cast localized composite wear zone, formed by in-situ casting of a casting insert, disposed in the manganese steel alloy body, the at least one in-situ cast localized composite wear zone comprising metal carbide or metal boride particles selected from TiC, ZrC, NbC, TaC, TiB2, and ZrB2 distributed in a steel alloy matrix, wherein the metal carbide or metal boride particles have an average dimension of 0.5 to 3.0 μm, and the at least one in-situ cast localized composite wear zone has a Vickers Hardness that is at least 700 and at least 50% greater than a Vickers Hardness of the un-reinforced manganese steel alloy body, wherein a bonding region disposed between the in-situ cast localized composite wear zone and the un-reinforced manganese steel alloy body is continuous and free of cracks, and wherein the in-situ cast localized composite wear zone is unfragmented such that the wear zone is not fragmented into different parts and retains a defined shape of the casting insert, and wherein the casting insert includes 20-40% by weight moderator powder.