Study On The Tribology Performance Of BTW Medium Manganese Wear Resisting Steel

The abrasive of the chute of scraper conveyor is most serious in the mining industry because of the working conditions, which under the low and media impact load of the hard mineral. It is, however, the traditional Hadfield steel can’t content the application of the mining industry due to it can’t working harden wally at the low impact energy. And the abrasion performance of martensitic wear-resistant steel is poor due to the high hardness but low ductility and toughness. The paper researched the hot rolling of austenitic media manganese steel(BTW) which under the alloying treatment. The BTW is easy work hardening in the low and media working condition due to the austenitic is unstable after the alloying treatment and the content of manganese. The paper research the multiple forms of wear experiment on the basis of the practical working situation including two and three-body abrasive wear. The mechanism of the wear and working harden was analyzed by the optical microscope, SEM, TEM and XRD.The results show the comprehensive mechanical properties of the BTW is better than the ZGMn13 particularly the impact strength under-40℃. In the result of block-ring abrasion test shown that with the increasing of the loading mass loss increased, and the wear-resistant of the BTW is batter without the abrasive materials. The wear-resistant of the BTW is the best compared with the ZGMn13, HD-series steel and JFE400 steel under the same condition. And the hardness of the worn surface increased to 50 HRC, the work-hardening effect was obviously. The mechanism of the abrasion is the cutting wear and the fatigue wear, the worn surface appear the gouging pits after adding the abrasive material. With the increasing of the impact energy, the deepness of the gouging pit and furrow increased.In two-body wear tests, BTW steel had the better wear performance in the gangue and quartz conditions. There was cutting mainly on the morphology of worn surface, however the gouging pits appeared at the worn surface in the quartz conditions. In the three-body wear tests, BTW steel had the highest wear mass loss in the coal power condition in comparison to the contrasting steels(HD-series and JFE400), however the wear performance is better than contrasting steel in the quartz conditions due to the notable work hardening to BTW steel of the harder abrasion. The morphology of worn surface is cutting and plowing mainly, however it was more dipper and larger in the quartz conditions contrasted with coal power and the mass loss was more than it in the coal power conditions.The BTW steel had the better abrasion performance from 2.5J to 4J in the impact abrasion test, in addition, it showed the best abrasion performance at 3.5J while had the worst abrasion performance at 1.5J. The mass loss of abrasion increased with the increasing of the impact energy and times under different conditions. The reason for the abrasion resistant is the work-hardening of worn surface, the depth of the hardening was more than 3000μm. From the results of TEM, martensite, dislocation and stacking fault were observed in worn surface under 1.5J and 3.5J impact energy, so the mechanism of the work hardening is synthetic action of these transformations, however the shape of the dislocation is cellular structure at 1.5J, and it was tangled to dislocation wall at 3.5J, and twin and stack fault at 3.5J was broader than which at the 1.5J. In addition, the mechanism of the abrasion is the combine action of the micro-cutting, micro-cracking and micro-fatigue. With the increasing of the impact energy, the micro-fatigue increased while with the increasing of the impact times, the mechanism transformed to the micro-fatigue mainly from the cracking, cutting and plough.