Studying on microstructure and mechanical properties of low manganese steel when modificated by Al and Ti
Bao Quoc Doan†, Duong Nam Nguyen‡,*, Tien Dung Nguyen‡,*, Dinh Tuyen Nguyen‡†,*, Anh Tuan Vu‡, Minh Nhat Nguyen‡‡,*, Thi Minh Hao Dong‡†
† Faculty of Mechanical Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh city, Vietnam
‡ School of Mechanical Engineering, Vietnam Maritime University, Hai Phong, Viet Nam
‡† Institute of Mechanical Engineering, Ho Chi Minh City University of Transport, Ho Chi Minh city, Vietnam
‡‡ Institute of Engineering, Ho Chi Minh City University of Technology (HUTECH), Ho Chi Minh city, Vietnam
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In this paper, the results are presented on the influence of Al and Ti on the microstructure and mechanical properties of low Manganese steel. These research results show that for samples not modified by Al combined with Ti, the microstructure appear delta ferrite phases; This phase is formed from the melting alloys state. In addition, the grain sizes of these alloys are very coarse: for undenatured alloys the smallest grain size reaches 1,055mm; for samples denatured with Al the grain size is 0.65mm; for samples modified with both Al and Ti, the grain size is 60 µm equivalent to ASTM grade 4 – this is the appropriate grain grade for alloys for casting castings. The obtained mechanical properties of modified steel in the following cases are as follows: the toughness value is 25J/cm2