Banding Effect on the Hardenability of AISI 4340 Steel Bar: Case Study

Tuesday, September 17, 2013: 10:30 AM
140 (Indiana Convention Center)
Dr. Lauralice Canale , University of São Paulo, Sao Carlos, Brazil
Jan Vatavuk , Universidade Presbiteriana Mackenzie, São Paulo, Brazil
Mr. Silvio André de Lima Pereira , Mahle Metal Leve S.A. Centro Tecnológico., Jundiaí, Brazil
Mr. Antonio Augusto Couto , Universidade Presbiteriana Mackenzie, São Paulo, Brazil
Mr. Silas Aragão de Sousa , Mahle Metal Leve S.A. Centro Tecnológico., Jundiaí, Brazil
Present work is a case study of a mill shaft from AISI 4340 (240mm diameter) tempered and quenched showing mixed structures (bainite and martensite) as in the surface as in the core. Evaluation on the longitudinal direction of the bar shown a coarse banding structure. Thickness band corresponds about four or five austenite grain sizes. Chemical analysis confirmed that the banding structure was responsible for the differential hardenability.           
See more of: Processes & Applications - Session III
See more of: Processes and Applications