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High manganese the treatment of the water toughening organized as a single austenite, it has a relatively high impact toughness, rarely occurs in normal circumstances brittle fracture. It has wear-resistant properties, under the conditions of the strong impact, the surface rapidly produce work hardening, the hardness reached 500HB-700HB. So, is widely used to withstand the impact on large parts, such as track shoe, jaw jaw crusher, excavator bucket teeth, ball mill liner. Alloying is one of the effective ways to improve the wear resistance of austenitic steels. Research trends at home and abroad to join in the traditional high manganese steel Cr, Mo and other alloying elements strengthened to enhance its strain hardening capacity, so as to improve the wear resistance of austenitic. The study has some theoretical and practical significance for the direction the organization and performance of the micro-alloying high manganese steel less. Micro-alloyed high-manganese steel of this study is a new type of wear-resistant steel material, adding it is appropriate on the basis of conventional high-manganese steel micro-alloying elements boron, chromium, rare earth obtained. In this study, the analytical samples were taken from the on-site production of castings (ball mill cylinder liner, jaw crusher jaw, bulldozer shovel blade) and different water toughening process analysis comparing the various conditions under the material organization and wear resistance. Specific studies: (1) heat treatment process (2) by adding micro-alloying elements such as chromium and boron mobility of high-manganese steel casting wear resistance of the jaw crusher jaw plate, ball mill liners, bulldozer shovel blade; linear shrinkage, microstructure, hardness, impact toughness, determination and research; (3) failure analysis type and analysis of the parts with fresh worn surface debris to determine component wear. In this paper, the laboratory studies and actual use parts wear combine, has a certain theoretical and practical significance. Experimental results show that: After micro-alloying high manganese steel casting, its wear resistance is improved, micro-alloyed high-manganese steel jaw life expectancy has increased by 2.3 times compared to the ordinary high-manganese steel castings; ball mill lining board life by at least 0.2-fold; the shovel blade life expectancy has increased by 0.3 times; micro-alloying elements B, Cr, RE to improve the organization and performance of high-manganese steel jaw jaw crusher, ball mill liners, bulldozing The main reason for the increase blade life. 3 different heat treatment on the impact toughness of high manganese steel and ductile-brittle transition temperature have a great impact on the 1080 ° C water toughening treatment, micro-alloyed high-manganese steel ductile-brittle transition temperature of -40 ° C; 1050 ℃ water toughening processing ductile-brittle transition temperature of 0 ° C; 3 by transmission electron microscopy analysis shows water toughening treatment microalloy the organization of high-manganese steel austenitic alloy carbides. Carbide (Fe, Cr) 3C, (Fe, Mn) 3C or (Fe, Cr, Mn) of the 3C structure exists; borides in the grain boundary precipitation of M23 (C, B) 6 form.
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