Influence of Heat Treatment Processing Three Phase Region on the Microstructure and Hardness ADI Alloys
Long Vuong Hoang†, Hai Nguyen Hong ‡,*, Tuan Hoang Anh‡, Tuan Vu Anh‡†, Dinh Tuyen Nguyen‡‡,*, Sang Le Tan‡‡†,*
† Faculty of Mechanical Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh city, Vietnam
‡ School of Materials Science and Engineering, Hanoi University of Science and Technology, Hanoi, Viet Nam
‡† Faculty of Basic Science, Vietnam Maritime University, Hai Phong, Viet Nam
‡‡ Institute of Mechanical Engineering, Ho Chi Minh City University of Transport, Ho Chi Minh city, Viet Nam
‡‡† Institute of Engineering, Ho Chi Minh City University of Technology (HUTECH), Ho Chi Minh city, Vietnam
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In this paper, the Austempering Ductile Iron (ADI) with Dual Matrix Structure is the alloy which has high strength and ductility, good wear resistance and machinability. Structural studies show that in ADI bridge cast iron there are proeutectic ferrite and ausferrite phases. The ausferite phase is characterized by a phase that has ferrite and is rich in carbon in its structure. The heat treatment process of the research alloy is performed as follows: The alloy is heated to a completely austenite state in the temperature range from 870 to 930oC for a period of 90 to 120 minutes, then alloy It was incubated in a three-phase zone for 90 minutes and finally austempered at 360 oC for 120 minutes. This heat treatment creates an microstructure with a structure consisting of proeutectoid ferrite and ausferrite. The mechanical properties of the research alloy depend on the proportion of the ferrite phase that depends on the heat treatment process in the three-phase region.