Usman SUDJADI; R. V. SINAGA. A Descriptive Study of the Hardness and Microstructure Profiles of SKD61 Steel Plunger Tip (Local Material) after Plasma Nitriding. New Approaches in Engineering Research Vol. 4, [S. l.], p. 82–94, 2021. DOI: 10.9734/bpi/naer/v4/2186F. Disponível em: https://stm.bookpi.org/NAER-V4/article/view/1884. Acesso em: 13 jun. 2026.