Research Of The Influence Of Component,Microstructure And Impact Energy On The Impact Corrosion And Abrasion Mechanisms Of The Low Carbon High Alloy Steels With Ni Replaced By Mn

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, which has good performance of anti impact corrosion and abrasion. However, the resource of Ni is rare and its price has recently aroused sharply recently, so as to use other element to replace Ni to cut the cost down. This article use Mn to replace Ni to make low-cost LCHA, and the effect of Mn on structure and properties of LCHA was discussed following.Mn and Ni , as two alloying element, both of which are the austenite-formed element, that both can form the solid solution - austenite of ultimate mutual solubility with Fe. So as to gain the single-phase austenite organize, it is feasible to use Mn to replace Ni. At the same time, Mn has stronger solution strengthening effect than Ni, which can improve the performance of the steel. Besides, the formation of MnS can replace FeS, which can prevent the formation of hot cracks to benefit welding. Also Mn can counteract some disadvantage effect of harmful element, and it is one of the element which can reduce crystal crack sensibility.Through analysing, calculating and alloy designing, this article determined the content of Mn which is used to replace Ni, and then gained the LCHA with different Mn content through fusion metallurgy. LCHA with Mn were casted, annealed, then Q-quenched according to preset processes. Structures after different treatments were observed with the help of metallographic microscope, XRD and microhardness. Mechanical properties and uniform corrosion resistance were alsoexamined. The results indicate that LCHA with Mn in place of Ni could gain the anticipated structure and performance.Under three different impact energy, LCHA with Mn in place of Ni were tested with a modified MLD-10 wear tester to investigate their behavior of corrosive impact abrasion. The results indicate that performance of LCHA after substitution for nickel with manganese proved to less than original LCHA, but better than the high manganese steel. At last, this article also discussed the mechanisms of corrosive impact abrasion for these LCHA after substitution for nickel with manganese.