国内齿辊式破碎机常用齿板材料的组织和性能

Microstructure and Properties of Common Domestic Tooth-plate Materials for Tooth-roll Crushers

通过组织观察、力学性能检测和磨损实验,对比研究了洗煤生产过程中齿辊式破碎机的国内4种常用齿板材料的组织和性能。结果表明,进口齿板材料的组织由板条马氏体和6.13%的残余奥氏体组成;高锰钢齿板的组织为单相奥氏体组织;ZG32CrMnSiNi2Mo齿板的组织由贝氏体铁素体板条和13.18%残余奥氏体组成;ZG22CrMnSiNiMo齿板为粒状贝氏体组织,组织中条型M-A岛比例较多,残余奥氏体量为14.9%。940℃淬火+200℃回火后,进口齿板材料具有最优的综合性能,硬度和冲击韧性分别为44.1 HRC和34.5 J;高锰钢齿板水韧处理后平均硬度为216.5 HB,冲击韧度为113.8 J;ZG32CrMnSiNi2Mo齿板900~940℃正火处理后,冲击韧度值略低于进口齿板的供货状态,但硬度高于进口齿板;960~1000℃正火处理后,ZG22CrMnSiNiMo齿板硬度略低于进口齿板材料,冲击韧度略高于进口齿板材料。选取进口齿板材料供货状态为标准,高锰钢齿板材料的相对耐磨性较低,仅为0.76;ZG32CrMnSiNi2Mo齿板材料经900~980℃正火处理后,耐磨性能较好,相对耐磨性为1.19~1.23;ZG22CrMnSiNiMo齿板材料经920~1000℃正火处理,耐磨性能介于进口齿板材料和ZG32CrMnSiNi2Mo齿板材料之间,相对耐磨性为1.10~1.13。

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.