Study on Microstructural and Hardness Changes in Medium Carbon Steel with Heat Treatment at Austenizing TemperatureAgung Supriyanto, Reyzaldy Robby Wicaksono, Margono, Agus Jamaldi, Nugroho Tri Atmoko and Afif FaishalE3S Web Conf., 706 (2026) 02012DOI: https://doi.org/10.1051/e3sconf/202670602012