An Investigation On Effects Of Alloying Elements On Stucture And Properties Of Low Carbon High Alloy Steel

Wet grinding liner usually works under severe condition, which combine corrosion, impact and abrasion together. Traditional liner materials, such as high manganese steel, medium carbon alloy steel, high chromium cast iron, hold special features for each. However, the comprehensive performance of these are not satisfying. The development of low carbon high alloy steel(LCHA) have provided quite a good solution for this problem. LCHA is a new category of steels, and the effect of alloying elements on structure and properties of LCHA were discussed following.As an essential element in alloy steels, carbon may change properties of steels greatly with only slight content variation. So the effect of carbon in LCHA were discussed in this paper. LCHA of three kinds of carbon content within low carbon range were prepared. Nickel is unique in improving properties of alloy steels, but also expensive and limited in resources. On the other hand, manganese, one of the substitutes for nickel, is quite cheap. Therefore, under certain carbon content, instead of nickel, same percentage of manganese were added in LCHA to see if it works.LCHA with several variations of composition were casted, annealed, then quenched and tempered according to preset processes. Structure after different treatments were observed with the help of metallographic microscope, XRD and microhardness. Mechanical properties and uniform corrosion resistance were also examined. The results indicate that carbon influences structure and properties of LCHA significantly, and substitution for nickel with manganese may result in expected structure and properties.LCHA with several variations of composition were tested with a modified MLD-10 wear tester to investigate their behavior under corrosive impact abrasion. The results indicate that excess or lack of carbon may lead to bad performance. Performance of LCHA after substitution for nickel with manganese proved to be the best under such a test condition. Also, mechanisms of corrosive impact abrasion for these LCHA differ from each other.