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| Quenching and partitioning microstructure and mechanical properties of medium manganese steel bearing titanium |
| DENG Jie1, SONG Xin-li1, SUN Xin-jun2, JIA Juan1, LIANG Xiao-kai2, FAN Li-xia1 |
1. State Key Laboratory of Refractory Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
2. Institute of Structural Steels, Central Iron andSteel Research Institute, Beijing 100081, China |
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Abstract In order to research the microstructure and mechanical properties of medium manganese steel bearing titanium,the microstructure and strength and ductility and abrasive wear properties of the medium manganese steels after quenching from 165 ℃ to 240 ℃ and partitioning at 380 ℃ for 10 min were studied by scanning electron microscope,transmission electron microscope and electron backscatter diffraction technique and Universal tensile testing machine and abrasive wear tester. The results show that the microstructure of the test steel are mainly composed of lath primary martensite,block secondary martensite,retained austenite,large number of micro-scale TiN and nano-scale precipitated phase particles (Ti,Mo)C and TiN-(Ti,Mo)C composite phase in the test steel. The highest volume fraction of retained austenite is 12.5% for the steel quenched at 190 ℃ and partitioning at 380 ℃ which yield strength is more than 1 000 MPa,the tensile strength is more than 1 500 MPa,and the hardness is from 482.5HV to 542.2HV,the elongation is from 9.2% to 14.5%. The wear resistance of the test steel after quenching from 165 ℃ to 190 ℃ is better than that of the steels quenching from 220 ℃ to 240 ℃. Wear mechanism is mainly micro-cutting and fatigue failure. Strain induced martensitic transformation (TRIP) effect occurs in residual austenite during wear,and precipitated phase particles hinder the plow during plastic deformation and scraping behavior of abrasive particles. The experiments indicates that a certain volume fraction of retained austenite in the steels by quenching-partitioning treatment is beneficial to improve the properties of strength and ductility and wear resistance. The optimized quenching partitioning process of the steel with optimal mechanical properties is austenitizing 30 min at 900 ℃ following quenching at 190 ℃ and then partitioning at 380 ℃ for 10 min.
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Received: 20 November 2020
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2021, Vol. 56 
