Microstructure and Properties of Common Domestic Tooth-plate Materials for Tooth-roll Crushers
Author of the article:LIU Zhixue;LIU Yuanyuan;WANG Hong;WANG Jun;FENG Yi;JIAN Zengyun
Author's Workplace：Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices,Xi'an Technological University,Xi'an 710032,China;New Product R&D Department,Sichuan Qinling Mountains Science and Technology Co.,Ltd.,Mianyang 621000,China
Key Words：tooth-roll crusher tooth plate microstructure properties
Abstract：Microstructure and properties of four kinds of common domestic tooth-roll crusher materials in coal washing production were compared and studied by means of microstructure observation, mechanical properties test and wear experiments. The results show that the microstructure of the plate is composed of lath martensite and 6.13% residual austenite. The microstructure of high manganese steel tooth plate is single phase austenitic structure. The structure of ZG32CrMnSiNi2Mo tooth plate is composed of lath bainite and ferrite, and 13.18% residual austenite. The ZG22CrMnSiNiMo tooth plate is granular bainitic with a large proportion of strip-type M-A island and a residual austenitic volume of 14.9%. After quenching at 940 ℃ and tempering at 200 ℃, the imported plate materials have the best comprehensive performance, and its hardness and impact toughness are 44.1 HRC and 34.5 J, respectively. After water toughening treatment, the average hardness of the tooth plate of high manganese steel is 216.5 HB, and the impact toughness was 113.8 J. ZG32CrMnSiNi2Mo plate after 900~940 ℃ normalizing, the impact toughness value is slightly lower than the supply state of the imported plate, but the hardness is higher than that of the imported plate. After normalizing at 960-1000 ℃, the hardness of ZG22CrMnSiNiMo plate is slightly lower than that of the imported plate, and the impact toughness is slightly higher than that of the imported plate. The supply state of the feed plate materials is selected as the standard, and the relative wear resistance of the high manganese steel plate material is low, only 0.76. ZG32CrMnSiNi2Mo tooth plate materials after 900~980 ℃ normalizing, wear resistance is better, the relative wear resistance varies from 1.19 to 1.23;ZG22CrMnSiNiMo plate is normalized at 920~1000 ℃, and its wear resistance is between that of the imported plate and that of ZG32CrMnSiNiMo and the relative wear resistance varies from 1.10 to 1.13.
