Effect Of Vanadium And Titanium On Microstructure,Mechanical Properties And Wear Resistance Of High Manganese Steel

Foundry industry is the basic industry in our country's industry.With the advancement of technology and the harmonious development of society,the development of the industry has become more mature.At the same time,with the advent of a new era,society has also put forward higher requirements on material properties.As a result,various new and innovative casting technologies were put on the agenda.high manganese steel has served human progress for nearly 100 years and is still the main material used for hammerheads,linings and other components.High-manganese steel forms work-hardened layers under high impact loads,and its ability to withstand wear increases rapidly.However,its ability to resist wear is insufficient at lower impact loads.When a single austenite is formed,the high manganese steel easily causes coarse grains due to the high temperature during heat treatment,and the addition of vanadium and titanium contributes to grain refinement of the high manganese steel.In this paper,high manganese steels with different contents of vanadium and titanium were studied in microstructure and mechanical properties.The microstructure of the sample,the microhardness distribution,and the impact loss energy and the wear loss of the sample under different impact loads were investigated.Observe the phase and composition of the metal by SEM and EDS.The results showed that:(1)The comparison of high-manganese steels after adding vanadium and high-manganese steels without vanadium showed that the grain refinement of high-manganese steels was obvious,the size of the oxide inclusions became smaller,and the distribution became more uniform.Adding titanium above the selected 0.15% vanadium content,after adding titanium,compared with the high manganese steel without titanium,the grain refinement of the high manganese steel was obvious,the size of the oxide inclusions became smaller,and the distribution was more diffuse and uniform.(2)The impact absorption energy of high-manganese steel after adding vanadium showed an increasing trend.In this experiment,when the vanadium content was 0.15%,the impact energy was increased by 144.7%,and the hardness was not significantly increased.The abrasive wear tests of the specimens with 2.5 J and 4.5 J loads showed that the wear resistance wasimproved.When the vanadium content was 0.15%,the wear resistance of the high manganese steel was the best.Under the low impact load of 2.5 J,The wear resistance of high-manganese steel with 0.15% vanadium content increased by 248.6% compared with vanadium-free high manganese steel.Under the impact load of 4.5J,The wear resistance of high-manganese steel containing 0.15% vanadium is 13.3% higher than that of vanadium-free high manganese steel.After adding vanadium,the wear resistance of high-manganese steel under low impact load was more obvious than that under high impact load.(3)The comparison of high-manganese steels after adding titanium and high-manganese steels without titanium showed that the grain refinement of high-manganese steels was obvious,In this experiment,when the titanium content was 0.15%,the impact absorption energy increased by 17.5% and the hardness did not increase obvious.The abrasive wear tests of the specimens with 2.5 J and 4.5 J loads showed that the wear resistance was improved.When the titanium content was 0.15%,the high manganese steel had the best wear resistance.Under the low impact load of 2.5 J,The wear resistance of high-manganese steel containing 0.15% titanium is 138.4%higher than that of titanium-free high manganese steel.Under the impact load of 4.5 J,The wear resistance of high-manganese steel containing 0.15% titanium is 14.5% higher than that of titanium-free high manganese steel.The wear resistance of high-manganese steel with 0.15%titanium content added with titanium under low impact load is more obvious than that under high impact load.