不同热处理工艺对新型齿板材料ZG32CrMnSiNi2Mo组织和性能的影响

Effect of Different Heat Treatment Processes on Microstructure and Properties of New Type of Tooth Plate Material ZG32CrMnSiNi2Mo

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。通过金相分析、透射电镜分析、XRD物相分析和力学性能检测,研究了该材料的组织和性能,结果表明:不同温度正火处理后实验材料的组织为无碳化物贝氏体组织,由贝氏体铁素体板条、残余奥氏体和少量的板条马氏体组成,随正火温度升高,组织中的贝氏体铁素体板条束尺寸增大,板条的宽度减小,长度增大。油淬和水淬后的组织由板条马氏体和残余奥氏体组成,与贝氏体铁素体板条相比,马氏体板条的间距较小、位错密度高。随正火温度的升高,实验材料的硬度、抗拉强度和冲击韧度均呈先升高后降低的变化趋势,900℃正火处理后实验材料的硬度具有极大值,940℃正火处理后,实验材料的抗拉强度和冲击韧度具有极大值,分别为1 583.1 MPa和29.0 J,随冷却速度的提高,实验材料的硬度和抗拉强度均呈逐渐升高、冲击韧度(AKU)呈逐渐下降的变化趋势。综合来看,实验材料空冷和风冷后具有较好的综合性能。分析了不同工艺热处理后,实验材料组织和性能变化的原因。

A new type of low alloy cast steel ZG32CrMnSiNi2Mo was developed according to the effect of alloy elements in steel,the actual working conditions and breakage mechanism of toothed roller crusher. The microstructure and properties of tooth plate material ZG32CrMnSiNi2Mo were studied by metallographic analysis,TEM analysis,XRD Phase analysis and mechanical property test, the results show the microstructure of the experimental material after normalizing at different temperatures is the carbide-free bainite,and it consists of bainite ferrite lath, retained austenite and a small number of lath martensite, with the increase of normalizing temperature,the size of bainite ferrite strip increases, the width of the strip reduce and the length of the slate increases. The microstructure after oil quenched and water quenched is composed of lath martensite and retained austenite, Compared with bainite ferrite lath, the spacing of martensitic slats is small and the density of dislocation is high. With the increase of normalizing temperature,the hardness,tensile strength and impact toughness of the experimental material increase first and then decrease, the hardness of the experimental material has great value after normalizing at 900 ℃,after normalizing at 940 ℃,the tensile strength and impact toughness of the experimental materials have a maximum value,which are 1 583.1 MPa and 29.0 J,respectively. With the increase of cooling rate,the hardness and tensile strength of the experimental materials are increasing gradually,and the impact toughness（AKU） decreases gradually. In a comprehensive view, the experimental materials have good comprehensive performance after air cooling and air cooling.The reasons for the change of microstructure and properties of experimental materials after heat treatment in different processes were analyzed.