Effect Of Cr Content On Impact Corrosion And Abrasion Properties And Mechanisms Of Low Carbon Alloy Steel

The steel used in liner board need cooperation of hardness, toughness and resistance of corrosion, the developed low carbon high alloy steel settles this problem well, the aim of this paper will discuss the influence of Cr content on impact corrosion and abrasion properties and mechanisms of low carbon alloy steel in order to enlarge serviceable range of this kind of steel, and to supply the data for industry application.In this study, we first tested the resistance of low carbon alloy steel of three kinds of Cr content to impact corrosion and abrasive wear. The test was carried out by a modified MLD-10 tester. The test methodology very well simulated the working condition of metallurgical industry. Then the behavior of impact corrosion and abrasion of the three steels in simulated metallurgical conditions was discussed. The results show that under the ironstone slurry, the wear loss of the low carbon high steel of 9% Cr content in different impact energy was the least, which indicates that its cooperation of hardness, toughness and resistance of corrosion is best. The wear loss of the low carbon high steel of 6% Cr content is secondary. The wear loss of the low carbon high steel of 3% Cr content is the most, and its deformation is the severest.At last the worn surface of low carbon alloy steel of three kinds of Cr content was studied by Hitachi-x-650 SEM(Scanning Electronic Microscope) in this paper, and the subsurface microstructures of the three steels were analysed through Olympus optical microscope, finally we definitely discussed the wear mechanism of the three steels. The results that under the simulated working condition of metallurgical industry, at the impact energy of 1.2J, the impact corrosion and abrasion mechanism of low carbon alloy steel of 3% Cr content is that in initial stage, the impact corrosion and abrasion mechanism is micro-cutting, then changes to wear due to the mutual action of corrosion and abrasion, finally the mechanism is deforming fatigue wear; the impact corrosion and abrasion mechanism of low carbon alloy steel of 6% Cr content is that in initial stage, the impact corrosion and abrasion mechanism is mainly micro-cutting, then changes to shallow spalling due to accumulated deformation, finally the mechanism is multiple plastic deformation; the impact corrosion and abrasion mechanism of low carbon alloy steel of 9% Cr content is multiple plastic deformation. Under the simulated working condition of metallurgical industry, at the impact energy of 2.0J, the impact corrosion and abrasion mechanism of low carbon alloy steel of 3% Cr content is that in initial stage, the impact corrosion and abrasion mechanism is multiple plastic deformation, in final stage, the mechanism changes to breadcrust fatigue wear; the impact corrosion and abrasion mechanism of low carbon alloy steel of 6% Cr content is that in initial stage, the impact corrosion and abrasion mechanism is multiple plastic deformation then the mechanism changes to spalling due to the mutual action of corrosion and abrasion; the impact corrosion and abrasion mechanism of low carbon alloy steel of 9% Cr content is that in initial stage, the impact corrosion and abrasion mechanism is micro-cutting, in final stage, the impact corrosion and abrasion mechanism changes to local shallow spalling due to breadcrust fatigue wear.