CHANGE IN MICROSTRUCTURE AND HARDNESS OF ADDITIVELY MANUFACTURED AISI H13 STEEL BY HEAT TREATMENT AND NITRIDING PROCESSES - Trung Van Trinh; S. Nguyen; Khanh Gia Pham; Christian Seidel; Anh Hoang Pham; Cuong Nhu Phung (Acta Metallurgica Slovaca, 2023)