1、中文 1955字 Influence of Impact Energy on Impact Corrosion abrasion of high Manganese Steel Abstract The impact corrosion abrasion properties and mechanism of high manganese steel were investigated under different impact energies The result shows that the wearability of the steel decreases with the inc
2、rease of the impact energy The dominant failure mechanism at a lower impact energy is the rupture of extrusion edge along root and a slight shallow-layer spalling It transforms to shallow-layer fatigue flaking along with serious corrosion abrasion when the impact energy is increased， and finally cha
3、nges to bulk flaking of hardened layer caused by deep work-hardening and heavy corrosion-abrasion Key words： wear characteristics； abrasion mechanism； impact energy；high manganese steel； impact corrosion-abrasion 1 Introduction It has been confirmed by intensive studies that impact, corrosion and ab
4、rasion enhance each other in the corrosion abrading procession under a low impact energy The strain difference cell induced by the higher dislocation density of pits and grooves bulging edge comparing to the pits bottom， in which pits and grooves are generated by abrasers rubbing and impacting the s
5、urface of material， and the accelerated brittle flaking by environmental brittleness under impact erosion condition. That interphase corrosion in multiphase alloy causes carbides flaking，and that corrosion medium is squeezed into crack and promotes the development of crack， which accelerates corrosi
6、on flaking to cause the acceleration of corrosion to abrasion Apparently, the behavior and mechanism of corrosive wear under impact stress are correlated to the value of the impact force Most of the traditional impact corrosion-abrasion experiments are finished under lower impact energy(2 J cm2)cond
7、ition It does not conform to mining wet mill grinders service conditions(impact energy is over 2 J cm2) In fact，under a higher impact force， the stress borne by material is different from that in low impact force， and even the failure mechanism in impact corrosive-abrasion process is also different.
8、 Therefore， the study on the influence of the impact energy under a high impact force on impact corrosion-abrasion has theoretical sense and actual reference value 2 Experimental High manganese steel which was poured into cast after smelting was chosen as tested material After l050 water toughening，
9、 the microstructure of experimental steel was fall austensite, whose hardness was HB214， impact toughness ka was 147J cm2 The cast ingot was linear cut into l0mml0mmn30mm impact corrosion-abrasion specimens。 High stress impact corrosion-abrasion experiment was carried out in an MLD 1 0 impact corros
10、ion wear tester Upper sample was cleaned in an ultrasonic cleaning machine with acetone before the test and fixed on the tester after drying and weighing It moved up and down following with the hammer, whose frequency was 200 times min Testing medium was acid iron ore slurry whose pH value was 4， in
11、 which abrasers were 5-6mm diameter iron ore particles（ whose value of Muhs hardness was 7 5)and the ratio of de-ionized water to iron ore particles was 5： 8 by volume Abrasers entered into the space between friction surface through agitating device continuously The wear samples were ultrasonically
12、washed in acetone after abrading experiment After being dried， samples were weighed and the mass loss was measured in order to determine the wear property. The wear surface morphologies of impact corrosion abrasion specimens were observed and analyzed by an X-650 scanning electron microscope The spe
13、cimens were cut perpendicularly to wear surface， and an Olympus PME optical microscope was used to study the microstructure and crack in subsurface stratum below the wear surface 3 Impact energy and impact corrosion-abrasion characteristies In the case of a low impact energy of2.0J， its steady wear
14、stage was longer And with the increase of the impact energy， the running-in stage and steady wear stage were shorten obviously Under 2.5J impact energy, the heavy wear stage was reached after about 6 hours Its acceleration wear stage was put forward to 4 hours under 3.0J impact energy According to t
15、he comparison of mass loss rate， with the increase of the impact energy， the impact corrosion-abrading mass loss of high manganese steel increased apparently When being worn for 2 hours， the rate of impact corrosion -abrading weight loss was 1： 3:7 at 2.0J， 2.5 J， and 3.0J impact energy ,respectivel
16、y When being worn for 8 hours it was 1:3.5:18 After being worn for 16 hours， the samples under 3.0J impact energy were already worn seriously, and the rate of weight loss under 2.0 J and 2.5J impact energy was 1:6 These results show the accelerating effect of impact on corrosion wear. The result men
17、tioned above shows that high manganese steel had a better impact corrosion-abrasion resistance under a lower impact energy As the impact energy increased， its wearability dropped apparently Especially when the impact energy increased to 3.0J， the impact corrosion-abrasion resistance became very low
18、According to the discussion of wear mechanism， it could be seen that high manganese steel had a preferable corrosion resistance to slow down the formation and deepening of corrosion pits effectively because it was single phase austenite steel It could obviously prevent the formation of microcracks originating at bottom of etch pits Crack could only form at micropore or high density dislocation area after some amount of distortion energy had been accumulated by deformation Under the condition of a low impact energy, the crack was not easy to form and propagate in subsurface
