HARDENING BAJA AISI-4120 DENGAN VARIASI HOLDING TIME. Machine : Jurnal Teknik Mesin, [S. l.], v. 8, n. 1, p. 19–23, 2022. DOI: 10.33019/jm.v8i1.2235. Disponível em: https://journal.ubb.ac.id/index.php/machine/article/view/2235. Acesso em: 11 jun. 2026.