齿板材料ZG32CrMnSiNi2Mo的组织和性能研究

Study on Microstructure and Properties of Tooth Plate Materials of ZG32CrMnSiNi2Mo

齿辊式破碎机齿板的性能会影响到齿板的使用寿命、产品质量、企业的生产效率和操作人员的工作量等因素,因此提高齿板材料的耐磨性和使用寿命具有重要的意义.根据齿辊破碎机的工况条件和破碎机理,结合合金元素在钢中的作用,研制了一种新型齿板用钢ZG32CrMnSiNi2Mo.以进口齿板材料作为对比材料,通过金相分析、透射电镜分析力学性能检测和耐磨实验研究了两种齿板材料的组织和性能.结果表明:两种齿板材料淬火、200℃回火后组织均由板条马氏体、残余奥氏体和少量碳化物组成,随回火温度的升高,组织中的碳化物有数量增多、尺寸聚集增大的趋势.进口齿板供货态的性能为A_(KU)30.0J和硬度43.4HRC,淬火后300℃以下回火,硬度均相对较高且数值变化不大,回火温度超过300℃,随回火温度的升高,材料的硬度逐渐降低.ZG32CrMnSiNi2Mo淬火后,随回火温度的升高,A_(KU)呈先升高后降低、再升高的变化趋势,抗拉强度σ_b和硬度均呈先升高后降低的变化趋势,300℃回火后具有最大值,具体值分别为σ_b 1733 MPa和硬度49.6 HRC.ZG32CrMnSiNi2Mo 200℃回火后,具有较好的相对耐磨性,其耐磨性为进口齿板(供货状态)的1.31倍.

The properties of the tooth plate of toothed roller crushers will affect the service life of tooth plates,the quality of products, production efficiency and the workload of operators, so improving the wear resistance and service life of tooth plate materials is of great significance. A new type of low alloy cast steel ZG32CrMnSiNi2Mo was developed according to the effect of alloy elements in steel and the actual working conditions and breakage mechanism of toothed roller crusher. With the imported tooth plate material as the contrast material, the microstructure and properties of two kinds of tooth plate materials were studied by metallographic analysis, TEM analysis, mechanical property test and wear resistance experiment. The results show that the microstructure of two kinds of tooth plate materials are composed of lath martensitic, retained austenite and a small amount of carbide after quenching and tempering at 200 ~C, and that the carbide in microstructure increases in quantity and size aggregation with the increase of tempering temperature. The performance of the supply state of the imported tooth plate is the impact toughness AKu 30. 0 J and the hardness 43.4 HRC,and the hardness is relatively high and the value changes little after quenching and tempering below 300 ℃. When the tempering temperature is over 300 ℃, the hardness of the material decreases with the increase of tempering temperature. With the increase of tempering temperature after quenching, the impact toughness of the ZG32CrMnSiNi2Mo increases first, then decreases, and then increases, the tensile strength and hardness increase first and then decrease, reaches the maximum value after tempering at 300℃. The tensile strength is 1 733 MPa and the hardness is 49.6 HRC. After tempering at 200 ℃ ,ZG32CrMnSiNi2Mo has better relative wear resistance,1.31 times as much as the imported toothed plate （supply state）.